New records of genera Astrenis and Phrudus (Hymenoptera, Ichneumonidae: Phrudus group) from Ukraine

 Українськаентомофауністика2025,16(1):29–32  Датапублікації:8.10.2025 Ukrainska Entomofaunistyka 2025 16(1) ISSN 2078–9653 http://doi.org/10.5281/zenodo.17295263 urn:lsid:zoobank.org:pub:514C2C06-DD3C-46F0-B93C-8F76BAB5EEFC NEW RECORDS OF THE GENERA ASTRENIS AND PHRUDUS (HYMENOPTERA, ICHNEUMONIDAE: PHRUDUS GROUP) FROM UKRAINE O. Varga I.I. Schmalhausen Institute of Zoology, NAS of Ukraine Bohdana Khmelnytskoho St. 15 Kyiv, 01054 Ukraine ORCID: http://orcid.org/0000-0002-6285-7830 E-mail: sancho.var[email protected] Varga, O. New records of genera Astrenis and Phrudus (Hymenoptera, Ichneumonidae: Phrudus group) from Ukraine. — In this paper, two species of the Phrudus group of genera, Astrenis paradoxus (Schmiedeknecht, 1907) and Phrudus compressus Vikberg, 2000, are recorded from Ukraine for the first time. Images and short diagnoses of the recorded species are provided. Key words: Darwin wasps, parasitoids, new records, Ukrainian Carpathians. Варга, О. Нові знахідки з родів Astrenis та Phrudus (Hymenoptera, Ichneumonidae: Phrudus group) в Україні. — Уперше для Україні зазначено два види з групи родів, близьких до Phrudus, а саме Astrenis paradoxus (Schmiedeknecht, 1907) та Phrudus compressus Vikberg, 2000. Ці види проілюстровано та надано короткі порівняльні діагнози. Ключові слова: їздці-іхневмоніди, паразитоїди, нові знахідки, Українські Карпати. Introduction The genera Astrenis Förster, 1869 and Phrudus Förster, 1869 are small Darwin wasp groups (Hymenoptera, Ichneumonidae) containing only seven and eleven species, respectively (Chiu & Wong, 1987; Vikberg & Koponen, 2000; Yu et al., 2016); of them five species altogether have been recorded from Ukraine so far (Varga, 2023, 2024). Both genera were classically placed in the subfamily Phrudinae (Townes, 1971), while more recent phylogenetic analyses (Quicke et al., 2009) grouped these genera with the members of the subfamily Tersilochinae (as so-called Phrudus group). However, there is still much uncertainty regarding of these relationships (Bennett et al., 2019). The members of the Phrudus group are endoparasitoids of different coleopterans (Gunthart, 1949; Franz, 1958; Bennett et al., 2019). Material and Methods The voucher specimens used in this study were collected with a sweeping net by the author in the Ukrainian Carpathians and adjacent territories in 2022 and 2025, in particular in the coniferous mountain forest near m. Vysoka (Gorgany) and deciduous lowland forest near Ivano-Frankivsk. The specimens are deposited in the collection of the Schmalhausen Institute of Zoology, NAS of Ukraine, Kyiv (SIZK). Images were taken using a Leica Українська ентомофауністика 2025 16(1) О. Варга, О. Нові знахідки Astrenis та Phrudus (Ichneumonidae) в Україні 30 Z16 APO microscope equipped with Leica FLEXACAM C1 camera and processed by LAS Core software at SIZK. Astrenis paradoxus (Schmiedeknecht, 1907) (Figs 1–4) Material examined. Ukraine: Ivano-Frankivsk Region, Zahvizdya, deciduous forest, sweeping, 48.94340, 24.62228, 06.06.2025, 1 ♀ (O. Varga) (SIZK). Diagnosis. This species can be distinguished from congeners by the combination of the following characters: head and metasoma (except first tergite) brownish yellow (Figs 1–3); fore tarsal claw pectinate to the apex, with subequal teeth; antenna with 16 flagellomeres; hind coxa rugose (Fig. 3). Figs 1–4. Astrenis paradoxus (Schmiedeknecht, 1907): 1 – habitus in lateral view, 2 – head in frontal view, 3 – propodeum and metasomal tergites 1–2 in dorsal view, 4 – wings. Scale bars: 0.5 mm (1) and 0.1 mm (2–4). O Varga New records of Astrenis and Phrudus (Ichneumonidae) from Ukraine Ukrainska Entomofaunistyka 2025 16(1) 31 Distribution. France, Germany, Sweden, United Kingdom (Vikberg & Koponen, 2000), and Ukraine (first record). Phrudus compressus Vikberg, 2000 (Figs 5–8) Material examined. Ukraine: Ivano-Frankivsk Region, Gorgany, slopes of m. Vysoka, 48.611402, 24.097001, 1000–1500 m, sweeping, 18–23.07.2022, 1 ♀ (O. Varga) (SIZK). Diagnosis. This species can be distinguished from congeners by the combination of the following characters: head and mesosoma not strongly compressed laterally; antenna with 14–16 flagellomeres, flagellomeres 4–5 each with a white tooth-like projection on the basal 0.2– 0.3 of the flagellomere; propodeum with carinae present, but weak, area petiolaris long, at least 1.4 times as long as maximum width (Fig. 7); fore wing with vein 3rs-m present anteriorly (Fig. 8); metasoma laterally compressed, second tergite at least 1.4 times as long as maximum width Figs 5–8. Phrudus compressus Vikberg, 2000: 5 – habitus in lateral view, 6 – head in frontal view, 7 – propodeum and metasomal tergites 1–2 in dorsal view, 8 – wings. Scale bars: 0.5 mm (5) and 0.1 mm (6–8). Українська ентомофауністика 2025 16(1) О. Варга, О. Нові знахідки Astrenis та Phrudus (Ichneumonidae) в Україні 32 (Fig. 7). For comparison of the closely related species, P. defectus Stelfox, 1966, see Fig. 5 in Varga (2023). Distribution. Described from the Nordic countries (Finland and Sweden) (Vikberg & Koponen, 2000), Ukraine (first record). References Bennett, A. M. R., Cardinal, S., Gauld, I. D. & Wahl, D. B. 2019. Phylogeny of the subfamilies of Ichneumonidae (Hymenoptera). Journal of Hymenoptera Research, 71: 1–156. https://doi. org/10.3897/jhr.71.32375 Chiu, S. C. & Wong, C. Y. 1987. The Phrudinae of Taiwan (Hymenoptera: Ichneumonidae). Taiwan Agricultural research Institute, Special Publication, 22: 1–18. Franz, J. M. 1958. Studies on Laricobius erichsonii Rosenh. (Coleoptera: Derodontidae) a predator on chermesids. Part I, distribution, life history and ecology. Entomophaga, 3: 109–164. https://doi. org/10.1007/BF02372257 Gunthart, E. 1949. Beitrage zur Lebenweise und Bekamfung von Ceuthorrhynchus quadridens Panz. und Ceuthorrhynchus napi Gyll. mit Beobachtungen an weiteren Kohlund Rapsschadlingen. Mitteilungen der Schweizerischen Entomologischen Gesellschaft, 22: 441–591. Quicke, D. L. J., Laurenne, N. M., Fitton, M. G. & Broad, G. R. 2009. A thousand and one wasps: a 28S rDNA and morphological phylogeny of the Ichneumonidae (Insecta: Hymenoptera) with an investigation into alignment parameter space and elision. Journal of Natural History, 43: 1305–1421. https://doi. org/10.1080/00222930902807783 Townes, H. K. 1971. The genera of Ichneumonidae, Part 4. Memoirs of the American Entomological Institute, 17: 1–372. Varga, O. 2023. The genera Astrenis Förster, 1869 and Phrudus Förster, 1869 (Hymenoptera, Ichneumonidae: Tersilochinae) in the Ukrainian Carpathians. Zootaxa, 5315(6): 584–592. https://doi. org/10.11646/zootaxa.5315.6.6 Varga, O. 2024. Checklist of the Ichneumonidae (Insecta, Hymenoptera) of Ukraine. Zootaxa, 5456(1): 001–131. https://doi.org/10.11646/ zootaxa.5456.1.1 Vikberg, V. & Koponen, M. 2000. On the taxonomy of Seleucus Holmgren and the European species of Phrudinae (Hymenoptera: Ichneumonidae). Entomologica Fennica, 11: 195–228. https://doi. org/10.33338/ef.84070 Yu, D. S., van Achterberg, C. & Horstmann, K. 2016. World Ichneumonoidea 2015. Taxonomy, biology, morphology and distribution. Taxapad interactive catalogue. Nepean, Ottawa. [database on flash-drive] Received 17.07.2025 Accepted 30.09.2025 Published 8.10.2025 © 2025 O. Varga