A survey of megachilid bees of the Nakhchivan Autonomous Republic of Azerbaijan, with description of a new species of Pseudoanthidium Friese, 1898 (Hymenoptera, Megachilidae)

221 A survey of megachilid bees of the Nakhchivan Autonomous Republic of Azerbaijan, with description of a new species of Pseudoanthidium Friese, 1898 (Hymenoptera, Megachilidae) Alexander V. Fateryga1, Mahir M. Maharramov2, Maxim Yu. Proshchalykin3 1 T.I.VyazemskyKaradagScientificStation–NatureReserveofRAS–BranchofA.O.KovalevskyInstituteofBiologyoftheSouthernSeasofRAS,NaukiStr.24, Kurortnoye,298188Feodosiya,Russia 2 NakhchivanStateUniversity,UniversityCampus,AZ7012Nakhchivan,Azerbaijan 3 FederalScientificCenteroftheEastAsiaTerrestrialBiodiversity,FarEasternBranchoftheRussianAcademyofSciences,100-letVladivostokuAve.159,690022 Vladivostok,Russia Correspondingauthor:MaximYu.Proshchalykin([email protected]) Copyright: © Alexander V. Fateryga et al. This is an open access article distributed under terms of the Creative Commons Attribution License (Attribution 4.0 International – CC BY 4.0). Research Article Abstract A list of 184 species of megachilid bees from 19 genera and five tribes is reported for the Nakhchivan Autonomous Republic of Azerbaijan. The list is based on 2,099 examined specimens identified to 171 species; 13 additional species are known on the base of literature records only. A new species, Pseudoanthidium (Exanthidium) astafurovae Fateryga, Maharramov & Proshchalykin, sp. nov., is described. Anthidium (Anthidium) akanthurum Nadimi & Talebi, 2014, sp. resurr., is recognised as a distinct species, not a synonym of A. (A.) gussakovskiji Mavromoustakis, 1939. Nineteen species are new to Azerbaijan: A. (A.) akanthurum, Chelostoma (Foveosmia) foveolatum (Morawitz, 1868), Coelioxys (Allocoelioxys) argenteus Lepeletier de Saint-Fargeau, 1841, C. (A.) obtusus Pérez, 1884, C. (Coelioxys) quadridentatus (Linnaeus, 1758), Heriades (Michenerella) punctulifera Schletterer, 1889, Hoplitis (Alcidamea) brachypogon (Pérez, 1879), H. (A.) campanularis (Morawitz, 1877), H. (Anthocopa) mocsaryi (Friese, 1895), Megachile (Eutricharaea) anatolica Rebmann, 1968, M. (Megachile) genalis Morawitz, 1880, Metadioxys graeca (Mavromoustakis, 1963), Osmia (Helicosmia) breviata Warncke, 1988, O. (H.) clypearis acuta Warncke, 1988, O. (Osmia) scheherazade Peters, 1978, O. (Tergosmia) rhodoensis (van der Zanden, 1983), Protosmia (Nanosmia) magnicapitis (Stanek, 1969), Pseudoanthidium (Pseudoanthidium) rhombiferum (Friese, 1917), and P. (P. ) syriacum Kasparek, 2024. Metadioxys formosus (Morawitz, 1875) and Coelioxys (Allocoelioxys) sogdianus Morawitz, 1875 are excluded from the fauna of Azerbaijan. The number of species of Megachilidae known from Azerbaijan is increased to 196. Key words: Biodiversity, Caucasus, new record, Palaearctic region, taxonomy Introduction The Megachilidae is the third largest bee family numbering more than 4,100 described species worldwide (Michener 2007; Ascher and Pickering 2025). The Nakhchivan Autonomous Republic (AR) is a landlocked exclave of Azerbaijan, with the area of about 5,500 km2. The territory of the autonomy is located within the Lesser Caucasus at altitudes of about 600–3,905 m a.s.l. (Maharramov Academic editor: Thorleif Dörfel Received: 27 September 2025 Accepted: 17 November 2025 Published: 5 December 2025 ZooBank: https://zoobank. org/89A8C5CC-A05F-420A-955DB99F86E365E2 Citation: Fateryga AV, Maharramov MM, Proshchalykin MYu (2025) A survey of megachilid bees of the Nakhchivan Autonomous Republic of Azerbaijan, with description of a new species of Pseudoanthidium Friese, 1898 (Hymenoptera, Megachilidae). ZooKeys 1262: 221–240. https://doi. org/10.3897/zookeys.1262.173271 ZooKeys 1262: 221–240 (2025) DOI: 10.3897/zookeys.1262.173271 222 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan 2015). Landscapes of the Nakhchivan AR are mostly xeric herb and shrub communities, with just a few trees along river valleys (Fig. 1), which are known as favourable for the bee diversity (Orr et al. 2020). In recent years, the megachilid bee fauna of the autonomy received a special attention. Several faunistic papers were published (Proshchalykin et al. 2019; Fateryga et al. 2020; Proshchalykin and Maharramov 2020; Maharramov et al. 2021, 2023), increasing the number Figure 1. Landscapes of the Nakhchivan Autonomous Republic of Azerbaijan. A. Dry slopes with sparse herbaceous vegetation and flowering Verbascum pyramidatum M. Bieb. (on the right) at Julfa, Daridagh-2, 1100 m, 20.VI.2024; B. Wormwood (Artemisia sp.) mountain semi-desert at Julfa, Daridagh-2, 1100 m, 19.V.2025; C. Community of Rhamnus erythroxyloides Hoffmanns. at Ordubad, Bilav, 1050 m, 22.V.2025; D. Community of Tamarix sp. at Ordubad, Bilav, 1050 m, 27.V.2025; E. Community of various shrubs at Shakhbuz, Badamli, 1290 m, 21.VI.2024; F. River valley at Ordubad, Unus, 1680 m, 24.V.2025. 223 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan of species known from the Nakhchivan AR to 160. At the same time, the number of species known from the whole of Azerbaijan was increased to 174, which was expected to be still very far from the true number of species occurring in the republic. However, new material collected in the autonomy in 2024 and 2025 contained numerous additional species new to Azerbaijan, as well as an undescribed species. The purpose of the present contribution is to publish a complete list of all species of megachilid bees known from the Nakhchivan AR to date. Material and methods Several field expeditions were made to various districts of the Nakhchivan Autonomous Republic of Azerbaijan in 2018 and 2019 by M. Proshchalykin, Kh. Aliyev, and M. Maharramov, in 2020–2022 by M. Maharramov, and in 2024 and 2025 by M. Proshchalykin and M. Maharramov. Collected specimens are deposited mainly in the collections of the Federal Scientific Center of the East Asia Terrestrial Biodiversity of the Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, Russia (FSCV, registration number 2797657) and the research collection of A.V. Fateryga, Feodosiya, Russia (CAFK). Old material deposited in the Institute of Zoology of the National Academy of Sciences of Azerbaijan, Baku, Azerbaijan (IZAB) and the Zoological Institute of the Russian Academy of Sciences, Saint Petersburg, Russia (ZISP) was also studied. A total of 2,209 specimens of megachilid bees from the Nakhchivan AR were examined. Selected specimens were sent to be deposited (some of them temporary) in the Entomological Collection of ETH Zurich, Switzerland (ETHZ), Muséum d’Histoire Naturelle de Neuchâtel, Switzerland (MHNN), and the research collections of M. Kasparek, Heidelberg, Germany (CMKH). Possible literature sources were also studied. Specimens were identified mostly using a reference collection (CAFK), as well as following keys by Kasparek (2022b, 2024), Bogusch (2023), Praz and Bénon (2023), and Müller (2025a). Many species of the tribe Osmiini were identified by A. Müller (Zurich, Switzerland). General distribution of species reported as new to Azerbaijan is based on Müller (2025b) for the tribe Osmiini, as well as Proshchalykin and Fateryga (2017), Bogusch (2023), Proshchalykin et al. (2023), Kasparek (2024), and Ascher and Pickering (2025) for other taxa. Results As the result of the study, 2,099 specimens of megachilid bees from the Nakhchivan Autonomous Republic of Azerbaijan were identified to 171 species. The remaining 110 specimens belonging to the tribes Osmiini and Megachilini unfortunately remained unidentified. Thirteen more species were added to the list of the megachilid bees known from the Nakhchivan AR on the base of literature records only, their occurrence in the autonomy require further confirmation. Thus, a total of 184 species from 19 genera and five tribes were revealed occurring in the Nakhchivan AR. Full label data of all specimens are represented in Suppl. material 1. One species is new to science, while 19 species are new to Azerbaijan; their full label data and general distribution are listed below. Besides them, three other species are new to the Nakhchivan AR: Pseudoanthidium (Pseudoanthidium) stigmaticorne (Dours, 1873), Stelis (Stelidomorpha) nasuta (Latreille, 1809), and S. (Stelis) phaeoptera (Kirby, 1802) (Table 1). 224 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Table 1. A list of the megachilid bees of the Nakhchivan Autonomous Republic of Azerbaijan (species new to the autonomy are indicated with an asterisk; species new to Azerbaijan are indicated with two asterisks). Species name Literature records Material examined Tribe Lithurgini Lithurgus chrysurus Fonscolombe, 1834 Maharramov et al. (2014, 2021) 124 ♀, 75 ♂ Lithurgus cornutus (Fabricius, 1787) Maharramov et al. (2014, 2021) 36 ♀, 34 ♂ Lithurgus tibialis Morawitz, 1875 Maharramov et al. (2023) 13 ♂ Tribe Osmiini Chelostoma (Chelostoma) emarginatum (Nylander, 1856) Proshchalykin and Maharramov (2020) 2 ♀, 1 ♂ Chelostoma (Chelostoma) mocsaryi Schletterer, 1889 Maharramov et al. (2014) – Chelostoma (Foveosmia) distinctum (Stöckhert, 1929) Proshchalykin and Maharramov (2020) 6 ♀, 41 ♂ Chelostoma (Foveosmia) foveolatum (Morawitz, 1868)** –4 ♀, 2 ♂ Chelostoma (Foveosmia) garrulum (Warncke, 1991) Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 11 ♀, 51 ♂ Chelostoma (Gyrodromella) orientale Schletterer, 1890 Proshchalykin and Maharramov (2020) 16 ♀, 17 ♂ Chelostoma (Gyrodromella) rapunculi (Lepeletier de Saint-Fargeau, 1841) Maharramov et al. (2014), as Ch. proximum; Proshchalykin and Maharramov (2020) 7 ♀, 8 ♂ Heriades (Heriades) crenulata Nylander, 1856 Maharramov et al. (2014) – Heriades (Heriades) rubicola Pérez, 1890 Maharramov et al. (2023) 5 ♀, 6 ♂ Heriades (Heriades) truncorum (Linnaeus, 1758) Maharramov et al. (2014, 2023) 6 ♀, 1 ♂ Heriades (Michenerella) punctulifera Schletterer, 1889** –2 ♀ Hoplitis (Alcidamea) acuticornis (Dufour & Perris, 1840) Proshchalykin and Maharramov (2020) 3 ♀, 1 ♂ Hoplitis (Alcidamea) brachypogon (Pérez, 1879)** –1 ♂ Hoplitis (Alcidamea) campanularis (Morawitz, 1877)** –2 ♀ Hoplitis (Alcidamea) eburnea (Warncke, 1991) Proshchalykin and Maharramov (2020) 1 ♀, 2 ♂ Hoplitis (Alcidamea) fulva (Eversmann, 1852) Proshchalykin and Maharramov (2020) 19 ♀, 6 ♂ Hoplitis (Alcidamea) leucomelana (Kirby, 1802) Maharramov et al. (2014); Proshchalykin and Maharramov (2020) 6 ♀, 5 ♂ Hoplitis (Alcidamea) mollis Tkalců, 2000 Proshchalykin et al. (2019); Ascher and Pickering (2025) 3 ♀ Hoplitis (Alcidamea) tridentata (Dufour & Perris, 1840) Proshchalykin et al. (2019); Ascher and Pickering (2025) 6 ♀, 1 ♂ Hoplitis (Anthocopa) bisulca (Gerstäcker, 1869) Proshchalykin and Maharramov (2020) 4 ♀, 6 ♂ Hoplitis (Anthocopa) dalmatica (Morawitz, 1871) Proshchalykin et al. (2019); Ascher and Pickering (2025) 1 ♀ Hoplitis (Anthocopa) fasciculata (Alfken, 1934) Proshchalykin et al. (2019); Ascher and Pickering (2025) 3 ♀, 6 ♂ Hoplitis (Anthocopa) grumi (Morawitz, 1894) Proshchalykin and Maharramov (2020) 4 ♀, 1 ♂ Hoplitis (Anthocopa) jakovlevi (Radoszkowski, 1874) Maharramov et al. (2014) – Hoplitis (Anthocopa) mocsaryi (Friese, 1895)** –1 ♀ Hoplitis (Anthocopa) perezi (Ferton, 1895) Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 5 ♀ Hoplitis (Anthocopa) yermasoyiae asiae (Tkalců, 1979) Proshchalykin and Maharramov (2020) 1 ♀ Hoplitis (Hoplitis) adunca (Panzer, 1798) Maharramov et al. (2014) 2 ♀ Hoplitis (Hoplitis) annulata crenulata (Morawitz, 1871) Proshchalykin and Maharramov (2020) 27 ♀, 28 ♂ Hoplitis (Hoplitis) astragali Fateryga, Müller & Proshchalykin, 2023 Fateryga et al. (2023); Ascher and Pickering (2025) 4 ♀ Hoplitis (Hoplitis) flabellifera (Morice, 1901) Proshchalykin and Maharramov (2020) 3 ♀ Hoplitis (Hoplitis) manicata (Morice, 1901) Proshchalykin and Maharramov (2020) 19 ♀, 26 ♂ Hoplitis (Hoplitis) mutica (Warncke, 1991) Proshchalykin and Maharramov (2020) 2 ♀, 1 ♂ Hoplitis (Hoplitis) parasitica (Warncke, 1991) Maharramov et al. (2023) 2 ♀ Hoplitis (Hoplitis) strymonia Tkalců, 1999 Maharramov et al. (2023) 5 ♀ Hoplitis (Pentadentosmia) laevifrons (Morawitz, 1872) Maharramov et al. (2014) – Hoplitis (Pentadentosmia) rufopicta (Morawitz, 1875) Maharramov et al. (2023) 1 ♂ Hoplitis (Pentadentosmia) tringa (Warncke, 1991) Proshchalykin and Maharramov (2020) 2 ♀, 2 ♂ 225 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Species name Literature records Material examined Osmia (Allosmia) melanura Morawitz, 1871 Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 8 ♀ Osmia (Allosmia) rufohirta Latreille, 1811 Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 2 ♀ Osmia (Erythrosmia) andrenoides Spinola, 1808 Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 13 ♀, 15 ♂ Osmia (Helicosmia) aeruginosa Warncke, 1988 Proshchalykin and Maharramov (2020) 1 ♀ Osmia (Helicosmia) aurulenta Panzer, 1799 Maharramov et al. (2014) 12 ♀ Osmia (Helicosmia) breviata Warncke, 1988** –1 ♀ Osmia (Helicosmia) caerulescens (Linnaeus, 1758) Maharramov et al. (2014); Proshchalykin and Maharramov (2020) 19 ♀, 10 ♂ Osmia (Helicosmia) cinerea Warncke, 1988 Proshchalykin and Maharramov (2020) 3 ♀ Osmia (Helicosmia) clypearis acuta Warncke, 1988** –4 ♀ Osmia (Helicosmia) dimidiata Morawitz, 1870 Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 19 ♀, 6 ♂ Osmia (Helicosmia) dives Mocsary, 1877 Proshchalykin et al. (2019); Ascher and Pickering (2025) 12 ♀, 3 ♂ Osmia (Helicosmia) labialis Pérez, 1879 Proshchalykin et al. (2019) 2 ♀ Osmia (Helicosmia) leaiana (Kirby, 1802) Maharramov et al. (2014, 2023) 3 ♀ Osmia (Helicosmia) melanogaster Spinola, 1808 Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020) 60 ♀, 24 ♂ Osmia (Helicosmia) niveata (Fabricius, 1804) Proshchalykin and Maharramov (2020) 1 ♀, 1 ♂ Osmia (Helicosmia) saxatilis Warncke, 1988 Proshchalykin and Maharramov (2020) 1 ♀ Osmia (Helicosmia) signata Erichson, 1835 Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 2 ♀, 6 ♂ Osmia (Helicosmia) subcornuta Morawitz, 1875 Proshchalykin and Maharramov (2020) 3 ♀, 2 ♂ Osmia (Hemiosmia) difficilis Morawitz, 1875 Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020); Ascher and Pickering (2025) 2 ♀, 1 ♂ Osmia (Hoplosmia) bidentata Morawitz, 1876 Maharramov et al. (2014); Proshchalykin and Maharramov (2020) 8 ♀, 13 ♂ Osmia (Hoplosmia) distinguenda (Tkalců, 1974) Proshchalykin et al. (2019); Ascher and Pickering (2025) 1 ♀ Osmia (Hoplosmia) ligurica Morawitz, 1868 Proshchalykin and Maharramov (2020) 11 ♀, 1 ♂ Osmia (Hoplosmia) scutellaris Morawitz, 1868 Proshchalykin and Maharramov (2020) 3 ♀, 6 ♂ Osmia (Melanosmia) parietina Curtis, 1828 Maharramov et al. (2014) – Osmia (Metallinella) brevicornis (Fabricius, 1798) Maharramov et al. (2014); Proshchalykin and Maharramov (2020) 35 ♀, 8 ♂ Osmia (Osmia) apicata Smith, 1853 Maharramov et al. (2014), as O. macroglossa; Proshchalykin and Maharramov (2020) 22 ♀, 57 ♂ Osmia (Osmia) bicornis globosa (Scopoli, 1763) Maharramov et al. (2014), as O. rufa; Proshchalykin et al. (2019); Proshchalykin and Maharramov (2020) 4 ♀, 4 ♂ Osmia (Osmia) cerinthidis Morawitz, 1876 Maharramov et al. (2014); Proshchalykin and Maharramov (2020) 4 ♀, 4 ♂ Osmia (Osmia) cornuta quasirufa Peters, 1978 Maharramov et al. (2014), as O. cornuta; Proshchalykin et al. (2019) 4 ♀, 1 ♂ Osmia (Osmia) mustelina Gerstäcker, 1869 Proshchalykin et al. (2019); Ascher and Pickering (2025) 1 ♀, 1 ♂ Osmia (Osmia) nigrohirta Friese, 1899 Proshchalykin and Maharramov (2020) 19 ♀, 1 ♂ Osmia (Osmia) scheherazade Peters, 1978** –1 ♀ Osmia (Pyrosmia) amathusica Mavromoustakis, 1937 Maharramov et al. (2023) 1 ♀ Osmia (Pyrosmia) cephalotes longiceps Morawitz, 1876 Proshchalykin and Maharramov (2020) 15 ♀ Osmia (Pyrosmia) cyanoxantha Pérez, 1879 Proshchalykin and Maharramov (2020) 9 ♀ Osmia (Pyrosmia) dilaticornis Morawitz, 1875 Maharramov et al. (2023) 1 ♂ Osmia (Pyrosmia) forticornis van der Zanden, 1989 Proshchalykin and Maharramov (2020) 1 ♀ Osmia (Pyrosmia) nana Morawitz, 1874 Maharramov et al. (2014) – 226 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Species name Literature records Material examined Osmia (Pyrosmia) versicolor Latreille, 1811 Proshchalykin et al. (2019); Ascher and Pickering (2025) 29 ♀, 4 ♂ Osmia (Pyrosmia) viridana Morawitz, 1873 Maharramov et al. (2023) 3 ♀, 2 ♂ Osmia (Tergosmia) rhodoensis (van der Zanden, 1983)** –3 ♀ Protosmia (Nanosmia) magnicapitis (Stanek, 1969)** –1 ♀ Protosmia (Protosmia) glutinosa (Giraud, 1871) Maharramov et al. (2023) 3 ♀ Tribe Anthidiini Afranthidium (Mesanthidium) carduele (Morawitz, 1876) Fateryga et al. (2020) 3 ♀, 7 ♂ Afranthidium (Mesanthidium) pusillum (Morawitz, 1894) Fateryga et al. (2020) 1 ♀ Anthidiellum (Anthidiellum) strigatum (Panzer, 1805) Warncke (1980); Maharramov et al. (2014); Fateryga et al. (2020) 1 ♀, 8 ♂ Anthidiellum (Anthidiellum) troodicum (Mavromoustakis, 1949) Fateryga et al. (2020), as A. breviusculum 2 ♂ Anthidium (Anthidium) akanthurum Nadimi & Talebi, 2014, sp. resurr.** Fateryga et al. (2020), as A. gussakovskiji (misidentified) 1 ♀, 2 ♂ Anthidium (Anthidium) cingulatum Latreille, 1809 Maharramov et al. (2014); Fateryga et al. (2020) 2 ♀, 6 ♂ Anthidium (Anthidium) dalmaticum Mocsáry, 1884 Fateryga et al. (2020) 9 ♀, 1 ♂ Anthidium (Anthidium) diadema Latreille, 1809 Maharramov et al. (2014); Fateryga et al. (2020) 1 ♀, 5 ♂ Anthidium (Anthidium) florentinum (Fabricius, 1775) Maharramov et al. (2014); Fateryga et al. (2020) 11 ♀, 6 ♂ Anthidium (Anthidium) punctatum Latreille, 1809, s. l. Fateryga et al. (2020) 5 ♀, 14 ♂ Anthidium (Anthidium) loti Perris, 1852 Maharramov et al. (2014); Fateryga et al. (2020) 3 ♀, 5 ♂ Anthidium (Anthidium) manicatum (Linnaeus, 1758) Warncke (1980); Maharramov et al. (2014) – Anthidium (Anthidium) melanopygum Friese, 1917 Fateryga et al. (2020), as A. spiniventre 10 ♀, 11 ♂ Anthidium (Anthidium) taeniatum Latreille, 1809 Fateryga et al. (2020) 1 ♀, 4 ♂ Anthidium (Anthidium) wuestneii Mocsáry, 1887 Warncke (1980); Fateryga et al. (2020) 12 ♀, 16 ♂ Anthidium (Gulanthidium) rotundum Warncke, 1980 Fateryga et al. (2020) 7 ♀, 13 ♂ Anthidium (Proanthidium) oblongatum (Illiger, 1806) Maharramov et al. (2014); Fateryga et al. (2020) 1 ♀ Anthidium (Turkanthidium) unicum Morawitz, 1875 Maharramov et al. (2023) 1 ♀ Eoanthidium (Eoanthidium) clypeare (Morawitz, 1874) Maharramov et al. (2014); Ascher and Pickering (2025) – Icteranthidium aequabile (Morawitz, 1896) Warncke (1980); Ascher and Pickering (2025) – Icteranthidium cimbiciforme (Smith, 1854) Fateryga et al. (2020) 8 ♀, 7 ♂ Icteranthidium croceum (Morawitz, 1877) Maharramov et al. (2014); Fateryga et al. (2020) 2 ♀ Icteranthidium grohmanni (Spinola, 1838) Warncke (1980); Fateryga et al. (2020) 2 ♀, 2 ♂ Icteranthidium limbiferum (Morawitz, 1875) Fateryga et al. (2020) 2 ♀ Icteranthidium urfanum (Warncke, 1980) Fateryga et al. (2020) 1 ♀ Pseudoanthidium (Exanthidium) astafurovae Fateryga, Maharramov & Proshchalykin, sp. nov. –1 ♂ Pseudoanthidium (Exanthidium) eximium (Giraud, 1863) Fateryga et al. (2020) 1 ♀, 1 ♂ Pseudoanthidium (Pseudoanthidium) melanurum (Klug, 1832) Maharramov et al. (2014); Fateryga et al. (2020) 8 ♂ Pseudoanthidium (Pseudoanthidium) nanum (Mocsáry, 1880) Fateryga et al. (2020) 2 ♂ Pseudoanthidium (Pseudoanthidium) reticulatum (Mocsáry, 1884) Fateryga et al. (2020) 3 ♀, 4 ♂ Pseudoanthidium (Pseudoanthidium) rhombiferum (Friese, 1917)** –5 ♀, 3 ♂ Pseudoanthidium (Pseudoanthidium) stigmaticorne (Dours, 1873)* –1 ♀, 1 ♂ Pseudoanthidium (Pseudoanthidium) syriacum Kasparek, 2024** –1 ♀ Pseudoanthidium (Pseudoanthidium) tenellum (Mocsáry, 1880) Fateryga et al. (2020) 1 ♂ Rhodanthidium (Asianthidium) aculeatum (Klug, 1832) Fateryga et al. (2020) 1 ♀, 4 ♂ Rhodanthidium (Asianthidium) caturigense (Giraud, 1863) Fateryga et al. (2020); Ascher and Pickering (2025) 1 ♀, 2 ♂ Rhodanthidium (Meganthidium) superbum (Radoszkowski, 1876) Maharramov et al. (2023) 1 ♀ Rhodanthidium (Rhodanthidium) septemdentatum (Latreille, 1809) Warncke (1980); Maharramov et al. (2014); Fateryga et al. (2020) 8 ♀, 10 ♂ Stelis (Protostelis) signata (Latreille, 1809) Warncke (1992) 1 ♀, 2 ♂ Stelis (Pseudostelis) denticulata Friese, 1899 Maharramov et al. (2023) 1 ♂ Stelis (Pseudostelis) minima Schenck, 1861 Maharramov et al. (2023), as S. minuta 1 ♀ 227 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Species name Literature records Material examined Stelis (Pseudostelis) minuta Lepeletier de Saint-Fargeau & Audinet-Serville, 1825 Warncke (1992); Maharramov et al. (2023) 1 ♂ Stelis (Stelidomorpha) nasuta (Latreille, 1809)* –1 ♀ Stelis (Stelis) breviuscula (Nylander, 1848) Maharramov et al. (2023) 1 ♀, 2 ♂ Stelis (Stelis) odontopyga Noskiewicz, 1926 Maharramov et al. (2014) – Stelis (Stelis) phaeoptera (Kirby, 1802)* –1 ♀, 1 ♂ Stelis (Stelis) scutellaris Morawitz, 1893 Fateryga et al. (2020) 4 ♀ Stelis (Stelis) simillima Morawitz, 1876 Warncke (1992); Fateryga et al. (2020) 1 ♂ Trachusa (Archianthidium) pubescens (Morawitz, 1872) Fateryga et al. (2020); Maharramov et al. (2023) 2 ♀, 1 ♂ Trachusa (Paraanthidium) anatolica Kasparek, 2020 Ascher and Pickering (2025) – Trachusa (Paraanthidium) heinzi Dubitzky, 2007 Fateryga et al. (2020) 1 ♂ Trachusa (Trachusa) byssina (Panzer, 1798) Fateryga et al. (2020) 1 ♂ Tribe Dioxyini Aglaoapis tridentata (Nylander, 1848) Maharramov et al. (2014) – Metadioxys graeca (Mavromoustakis, 1963)** Maharramov et al. (2021), as M. formosus (misidentified) 3 ♀ Tribe Megachilini Coelioxys (Allocoelioxys) acanthura (Illiger, 1806) Maharramov et al. (2021) 1 ♀ Coelioxys (Allocoelioxys) afer Lepeletier de Saint-Fargeau, 1841 Maharramov et al. (2021) 2 ♀, 4 ♂ Coelioxys (Allocoelioxys) argenteus Lepeletier de Saint-Fargeau, 1841** –1 ♂ Coelioxys (Allocoelioxys) castaneus Morawitz, 1886 Morawitz (1886); Schwarz and Gusenleitner (2003); Ascher and Pickering (2025) 1 ♀ Coelioxys (Allocoelioxys) caudatus Spinola, 1838 Maharramov et al. (2023) 1 ♂ Coelioxys (Allocoelioxys) echinatus Förster, 1853 Maharramov et al. (2014, 2021) 1 ♀, 7 ♂ Coelioxys (Allocoelioxys) haemorrhoa Förster, 1853 Maharramov et al. (2021) 2 ♂ Coelioxys (Allocoelioxys) obtusus Pérez, 1884** –1 ♂ Coelioxys (Coelioxys) quadridentatus (Linnaeus, 1758)** –2 ♀ Coelioxys (Melissoctonia) conoideus (Illiger, 1806) Maharramov et al. (2023) 1 ♀ Coelioxys (Paracoelioxys) elongatus Lepeletier de Saint-Fargeau, 1841 Maharramov et al. (2014) – Coelioxys (Rozeniana) aurolimbatus Förster, 1853 Maharramov et al. (2021) 1 ♀, 2 ♂ Coelioxys (Rozeniana) rufescens Lepeletier de Saint-Fargeau & Audinet-Serville, 1825 Maharramov et al. (2014) 1 ♀ Megachile (Chalicodoma) albocristata Smith, 1853 Maharramov et al. (2021) 4 ♀, 4 ♂ Megachile (Chalicodoma) albonotata Radoszkowski, 1886 Maharramov et al. (2021) 21 ♀, 4 ♂ Megachile (Chalicodoma) montenegrensis Dours, 1873 Maharramov et al. (2014), as M. ponticum; Maharramov et al. (2021) 13 ♀, 6 ♂ Megachile (Chalicodoma) parietina (Geoffroy, 1785) Maharramov et al. (2014, 2021) 7 ♀, 2 ♂ Megachile (Chalicodoma) pyrenaica (Lepeletier de Saint-Fargeau, 1841) Maharramov et al. (2014, 2021) 17 ♀, 4 ♂ Megachile (Creightonella) albisecta (Klug, 1817) Maharramov et al. (2014, 2021) 19 ♀, 14 ♂ Megachile (Creightonella) doriae Magretti, 1890 Maharramov et al. (2021) 1 ♀, 4 ♂ Megachile (Eutricharaea) anatolica Rebmann, 1968** –1 ♀, 2 ♂ Megachile (Eutricharaea) apicalis Spinola, 1808 Maharramov et al. (2014, 2021) 27 ♀, 23 ♂ Megachile (Eutricharaea) argentata (Fabricius, 1793) Maharramov et al. (2021), as M. pilidens 16 ♀, 6 ♂ Megachile (Eutricharaea) burdigalensis Benoist, 1940 Maharramov et al. (2021) 4 ♀, 2 ♂ Megachile (Eutricharaea) deceptoria Pérez, 1890 Maharramov et al. (2014, 2021) 9 ♀, 13 ♂ Megachile (Eutricharaea) giraudi Gerstäcker, 1869 Maharramov et al. (2021) 2 ♂ Megachile (Eutricharaea) leachella Curtis, 1828 Maharramov et al. (2021) 36 ♀, 54 ♂ 228 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Species name Literature records Material examined Megachile (Eutricharaea) leucomalla Gerstäcker, 1869 Maharramov et al. (2021) 6 ♀, 5 ♂ Megachile (Eutricharaea) marginata Smith, 1853 Maharramov et al. (2021) 8 ♀, 6 ♂ Megachile (Eutricharaea) melanogaster Eversmann, 1852 Maharramov et al. (2021) 2 ♀, 2 ♂ Megachile (Eutricharaea) rotundata (Fabricius, 1787) Maharramov et al. (2014, 2021) 19 ♀, 21 ♂ Megachile (Eutricharaea) semicircularis auct. nec van der Zanden, 1996 Maharramov et al. (2021) 31 ♀, 7 ♂ Megachile (Megachile) centuncularis (Linnaeus, 1758) Maharramov et al. (2014, 2021) 3 ♀, 2 ♂ Megachile (Megachile) genalis Morawitz, 1880** –4 ♀ Megachile (Megachile) melanopyga Costa, 1863 Maharramov et al. (2014, 2021) 2 ♀, 1 ♂ Megachile (Megachile) octosignata Nylander, 1852 Maharramov et al. (2021) 1 ♀, 1 ♂ Megachile (Megachile) pilicrus Morawitz, 1877 Maharramov et al. (2021) 15 ♀, 3 ♂ Megachile (Megachile) versicolor Smith, 1844 Maharramov et al. (2014, 2021) 2 ♀ Megachile (Pseudomegachile) ericetorum Lepeletier de Saint-Fargeau, 1841 Maharramov et al. (2021) 8 ♀, 11 ♂ Megachile (Pseudomegachile) flavipes Spinola, 1838 Maharramov et al. (2014, 2021) 12 ♀, 22 ♂ Megachile (Pseudomegachile) saussurei Radoszkowski, 1874 Maharramov et al. (2014) 12 ♀, 1 ♂ Megachile (Pseudomegachile) tecta Radoszkowski, 1888 Maharramov et al. (2021) 24 ♀, 9 ♂ Megachile (Xanthosarus) circumcincta (Kirby, 1802) Maharramov et al. (2014, 2021) 6 ♀, 12 ♂ Megachile (Xanthosarus) lagopoda (Linnaeus, 1761) Maharramov et al. (2014, 2021) 1 ♂ Megachile (Xanthosarus) maritima (Kirby, 1802) Maharramov et al. (2014, 2021) 16 ♀, 5 ♂ Megachile (Xanthosarus) willughbiella (Kirby, 1802) Maharramov et al. (2021) 2 ♀ New species records for Azerbaijan Chelostoma (Foveosmia) foveolatum (Morawitz, 1868) Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Ordubad, Mazra, 39°03'25"N, 45°55'30"E, 1615 m, 16.VI.2024, 4 ♀, 2 ♂, leg. M. Proshchalykin, M. Maharramov [FSCV]. Distribution. Western, Southern, and Eastern Europe, Russia (European part), Georgia, Azerbaijan, Turkey, Lebanon. Heriades (Michenerella) punctulifera Schletterer, 1889 Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Nakhchivan, 39°12'24"N, 45°43'49"E, 830 m, 4.VIII.2023, 1 ♀, leg. M. Maharramov [CAFK]; • Julfa, Daridagh-2, 39°03'58"N, 45°37'35"E, 1100 m, 30.V.2025, 1 ♀, leg. M. Proshchalykin, M. Maharramov [CAFK]. Distribution. Southern and Eastern Europe, Azerbaijan, Turkey, Cyprus, Syria, Lebanon, Israel and Palestine. Hoplitis (Alcidamea) brachypogon (Pérez, 1879) Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Shakhbuz, Kolani, 39°26'51"N, 45°39'13"E, 1330 m, 21.V.2025, 1 ♂, leg. M. Proshchalykin, M. Maharramov [CAFK]. 229 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Distribution. Western, Southern, and Eastern Europe, Azerbaijan, Turkey, Syria, Israel and Palestine, Iran. Hoplitis (Alcidamea) campanularis (Morawitz, 1877) Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Shakhbuz, Kolani, 39°26'51"N, 45°39'13"E, 1330 m, 28.V.2025, 2 ♀, leg. M. Proshchalykin, M. Maharramov [FSCV]. Distribution. Southern and Eastern Europe, Northern Africa, Russia (European part), Georgia, Azerbaijan, Turkey, Lebanon, Israel and Palestine. Hoplitis (Anthocopa) mocsaryi (Friese, 1895) Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Shakhbuz, Kulus-2, 39°21'51"N, 45°37'38"E, 1400 m, 28.V.2025, 1 ♀, leg. M. Proshchalykin, M. Maharramov [FSCV]. Distribution. Western, Southern, and Eastern Europe, Russia (European part), Armenia, Azerbaijan, Turkey, Israel and Palestine, Iran. Osmia (Helicosmia) breviata Warncke, 1988 Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Shakhbuz, Kechili, 39°22'N, 45°43'E, 1800 m, 12.VII.2019, 1 ♀, leg. M. Maharramov [CAFK]. Distribution. Southern Europe, Russia (European part), Azerbaijan, Turkey, Lebanon, Israel and Palestine, Iran. Osmia (Helicosmia) clypearis acuta Warncke, 1988 Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Sharur, Shahbulag, 39°38'57"N, 45°08'12"E, 1210 m, 26.V.2025, 3 ♀, leg. M. Proshchalykin, M. Maharramov [2 ♀, CAFK; 1 ♀, FSCV]; • Julfa, Daridagh-2, 39°03'58"N, 45°37'35"E, 1100 m, 29.V.2025, 1 ♀, leg. M. Proshchalykin, M. Maharramov [FSCV]. Distribution. Azerbaijan, Turkey, Syria, Jordan, Lebanon, Israel and Palestine, Iraq. Osmia (Osmia) scheherazade Peters, 1978 Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Shakhbuz, Badamli, 39°28'05"N, 45°33'00"E, 1290 m, 21.V.2025, 1 ♀, leg. M. Proshchalykin, M. Maharramov [FSCV]. Distribution. Russia (European part), Azerbaijan, Turkey, Iran. 236 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Coelioxys (Allocoelioxys) obtusus Pérez, 1884 Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Babek, Shikhmakhmud, 39°15'55"N, 45°25'33"E, 940 m, 7.VIII.2023, 1 ♂, M. Maharramov [FSCV]. Distribution. Western, Southern, and Eastern Europe, North Africa, Russia (European part), Azerbaijan, Turkey, Iraq, Iran, Turkmenistan. Coelioxys (Coelioxys) quadridentatus (Linnaeus, 1758) Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Shakhbuz, Kulus, 39°21'56"N, 45°40'54"E, 1620 m, 23.V.2025, 2 ♀, leg. M. Proshchalykin, M. Maharramov [FSCV]. Distribution. Western, Northern, Southern, and Eastern Europe, Russia (European part, Urals, Western Siberia, Eastern Siberia, Far East), Azerbaijan, Turkey, Iran, China. Megachile (Eutricharaea) anatolica Rebmann, 1968 Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Ordubad, Kotam, 38°53'25"N, 46°03'14"E, 700 m, 19.V.2025, 2 ♂, leg. M. Proshchalykin, M. Maharramov [FSCV]; • Ordubad, Bilav, 39°02'43"N, 45°49'07"E, 1050 m, 22.V.2025, 1 ♀, leg. M. Proshchalykin, M. Maharramov [FSCV]. Distribution. Southern Europe, Russia (European part), Azerbaijan, Turkey, Cyprus, Jordan, Lebanon, Israel and Palestine, Iran. Megachile (Megachile) genalis Morawitz, 1880 Material examined. Azerbaijan. Nakhchivan Autonomous Republic • Sharur, Shahbulag, 39°38'57"N, 45°08'12"E, 1210 m, 26.V.2025, 4 ♀, leg. M. Proshchalykin, M. Maharramov [1 ♀, CAFK; 3 ♀, FSCV]. Distribution. Western, Northern, Southern, and Eastern Europe, Russia (European part, Urals, Western Siberia, Far East), Azerbaijan, Turkey, Tajikistan, Kyrgyzstan, Kazakhstan, Mongolia, China, Japan. Discussion Maharramov et al. (2023) calculated that 174 species of megachilid bees were known from Azerbaijan and 160 of them were known from the Nakhchivan Autonomous Republic according to Maharramov et al. (2014, 2021, 2023), Proshchalykin et al. (2019), Fateryga et al. (2020), and Proshchalykin and Maharramov (2020). However, four species were overlooked in these calculations. Stelis (Pseudostelis) minima Schenck, 1861 was reported from the Nakhchivan AR by Maharramov et al. (2023) in remarks to S. (P. ) minuta Lepeletier de Saint-Fargeau & Audinet-Serville, 1825 and Hoplitis (Hoplitis) astragali Fateryga, Müller & Proshchalykin, 2023 was described from Dagestan (Russia) 237 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan with one paratype from the Nakhchivan AR (Fateryga et al. 2023). Megachile (Chalicodoma) monstrifica Morawitz, 1877 was described from the main territory of Azerbaijan (Morawitz 1877; Aliyev et al. 2018), and Pseudoanthidium (Pseudoanthidium) stigmaticorne (Dours, 1873) was reported from this country by Litman et al. (2021). In the present contribution, we have described a new species and reported 19 species new to Azerbaijan. In addition, three species previously known from Azerbaijan are reported as new to the Nakhchivan AR. At the same time, one species (Metadioxys formosus) is excluded from the fauna of Azerbaijan due to its incorrect previous identification by Maharramov et al. (2021). Another species that should be excluded from the fauna of Azerbaijan is Coelioxys (Allocoelioxys) sogdianus Morawitz, 1875 reported by Ascher and Pickering (2025) and mentioned also by Maharramov et al. (2021); its record was erroneous and based on a confusion with C. (A.) castaneus Morawitz, 1886, the only species of megachilid bees described from the Nakhchivan AR until recently (Schwarz and Gusenleitner 2003). Thus, 184 species are currently known from the Nakhchivan AR. A total of 171 species were identified among the material collected in the autonomy; these species are undoubtedly present in the regional fauna. At the same time, 13 species are known from the Nakhchivan AR on the base of literature records only; the presence of these species in the autonomy is unconfirmed and requiring further verification. A total of 196 species of megachilid bees are currently known from Azerbaijan as a whole. Thus, just 12 species reported from this country were not recorded in the Nakhchivan AR to date. These species are Hoplitis (Alcidamea) caucasica (Friese, 1920), H. (A.) curvipes (Morawitz, 1871), H. (A.) verruciventris (Morawitz, 1886), H. (Anthocopa) agis (Benoist, 1929), H. (Hoplitis) carinata (Stanek, 1969), Osmia (Pyrosmia) hellados van der Zanden, 1984, Anthidium (Proanthidium) trispinosum Friese, 1917, A. (P. ) undulatum Dours, 1873, A. (P. ) venustum Morawitz, 1877, M. (Ch.) alborufa Friese, 1911, M. (Ch.) monstrifica, and M. (Pseudomegachile) cinnamomea Alfken, 1926 (Aliyev et al. 2018; Fateryga et al. 2020; Proshchalykin and Maharramov 2020; Maharramov et al. 2021; Ascher and Pickering 2025). Therefore, we can conclude that the main territory of Azerbaijan is still poorly explored. A similar conclusion was recently made during a study of the pollen wasps (Fateryga et al. 2025). Further collecting efforts may surely reveal the existence of more species in this region. Acknowledgements We acknowledge the support of the late Khalid Aliyev (Baku, Azerbaijan) in our study of the bees and wasps of Azerbaijan. We also thank Yulia Astafurova (Saint Petersburg, Russia) for her help during our work in ZISP. We are especially grateful to Andreas Müller (Zurich, Switzerland) for his kind help in the identification of the bees of the tribe Osmiini and reviewing the manuscript. Additional information Conflict of interest The authors have declared that no competing interests exist. 238 ZooKeys 1262: 221–240 (2025), DOI: 10.3897/zookeys.1262.173271 Alexander V. Fateryga et al.: Megachilidae of Azerbaijan Ethical statement No ethical statement was reported. Use of AI No use of AI was reported. Funding The research was carried out within the state assignments of the Ministry of Science and Higher Education of the Russian Federation, No. 124030100098-0 (for A.F.) and No. 124012400285-7 (for M.P.). Author contributions All authors have contributed equally. Author ORCIDs Alexander V. Fateryga https://orcid.org/0000-0002-5346-3477 Mahir M. Maharramov https://orcid.org/0000-0002-4130-7071 Maksim Yu. 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ZooKeys 1187: 301– 339. https://doi.org/10.3897/zookeys.1187.113240 Schwarz M, Gusenleitner F (2003) Ergebnisse der Untersuchung von F. Morawitz beschriebenen Coelioxys-Arten, so wie weiterer von Eversmann, Friese und Radoszkowski beschriebenen Arten, nebst einigen Bemerkungen (Hymenoptera: Apidae: Megachilidae). Linzer Biologische Beiträge 35(2): 1221–1239. Warncke K (1980) Die Bienengattung Anthidium Fabricius, 1804 in der Westpaläarktis und im turkestanischen Becken. Entomofauna 1: 119–210. Warncke K (1992) Die westpaläarktischen Arten der Bienengattung Stelis Panzer, 1806 (Hymenoptera, Apidae, Megachilinae). Entomofauna 13: 341–376. Supplementary material 1 List of specimens examined Authors: Alexander V. Fateryga, Mahir M. Maharramov, Maxim Yu. Proshchalykin Data type: xls Explanation note: List of all 2209 examined specimens of the megachilid bees from the Nakhchivan Autonomous Republic of Azerbaijan. Copyright notice: This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0/). The Open Database License (ODbL) is a license agreement intended to allow users to freely share, modify, and use this Dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited. Link: https://doi.org/10.3897/zookeys.1262.173271.suppl1