Homotropus crassicornis Thomson, 1890

Morishita, Shunsuke & Watanabe, Kyohei, 2025, Review of the genera Homotropus Förster and Syrphoctonus Förster (Hymenoptera, Ichneumonidae, Diplazontinae) from Japan, Zootaxa 5588 (1), pp. 49-76 : 55-56

publication ID	https://doi.org/10.11646/zootaxa.5588.1.2
publication LSID	lsid:zoobank.org:pub:D6A24D15-616C-4BEB-B7F9-132180AE0C12
DOI	https://doi.org/10.5281/zenodo.14896372
persistent identifier	https://treatment.plazi.org/id/03D487FD-FF9E-8B6A-1BBA-20CD1DBAFBBD
treatment provided by	Plazi (2025-02-19 22:05:08, last updated 2025-02-25 20:01:17)
scientific name	Homotropus crassicornis Thomson, 1890
status

Treatment

( Figs 3 A–F View FIGURE 3 )

Homotropus crassicornis Thomson, 1890: 1490 .

Homocidus asyntactus Schmiedeknecht, 1926 : not seen.

Homotropus crassicornis : Dasch, 1964: 181.

Homotropus crassicornis : Klopfstein, 2014b: 64 View Cited Treatment .

Specimens examined. JAPAN: [Honshu] 1F, Yamagata Pref., Mamurogawa Town, 14. VII. 2012, Y. Matsubara & K. Fukuda leg. (MsT) ( KPMNH); 1F, Mie Pref., Inabe City, Mt. Fujiwaradake , 1. VI. 2021, S. Morishita leg. ( KPMNH); 2F, ditto, ( TMNH) . GERMANY: 1F (det. E. Diller), Gottingen , 6. VII. 1946, ( ZSM) . ITALY: 1M (det. E. Diller), Catania, Tremestieri Etneo , 4. V. 1994, Turrisi leg. ( ZSM) .

Diagnosis. See Klopfstein (2014b).

Distribution. Japan (Honshu). Outside Japan, this species is widely distributed in Western Palearctic region ( Yu et al. 2016).

Bionomics. Host is unknown. In Japan, adults were collected from the canopies of broad‐leaved trees at altitudes of ca. 1,000 meters.

Remarks. This is the first record of this species from Japan. Japanese specimens share the character states with the diagnosis of European specimens proposed by Klopfstein (2014b) well, while Japanese specimens differs from European specimens in the following character states: fore wing length 6.5–8.0 mm (5.1–6.5 mm in European specimens); hind trochantellus black with reddish-brown apex (entirely orange in European specimens); hind femur black with reddish-brown base (entirely orange in European specimens); hind tibia entirely black (orange with apex dark in European specimens). However, as no significant differences were found in other characters, we conclude that the observed variation is intraspecific variation within a single species.

References

Dasch, C. E. (1964) Ichneumon-flies of America north of Mexico: 5. Subfamily Diplazontinae. Memoirs of the American Entomological Institute, No. 3, 1-304.

Klopfstein, S. (2014 b) Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae). Zootaxa, 3801 (1), 5-125. https://doi.org/10.11646/zootaxa.3801.1.1

Schmiedeknecht, O. (1926) n. k. In: Opuscula Ichneumonologica. V. (Fasc. XLII - XLIII.) Tryphoninae. s. n., Blankenburg in Thuringen, pp. 3283-3442.

Thomson, C. G. (1890) XLIII. Ofversigt af arterna inom slagtet Bassus (Fab.). Opuscula Entomologica, Lund, XIV, 1459-1525.

Yu, D. S., van Achterberg, C. & Horstmann, K. (2016) Taxapad 2016. Ichneumonoidea 2015. Database on flash-drive. Available from: http://www.taxapad.com (accessed 26 August 2024)

Figures

FIGURE 3. Homotropus crassicornis Thomson, 1890, female (A–D) and male (E, F)―A, E: lateral habitus; B, F: head, frontal view; C: mesopleuron, lateral view; D: metasoma, dorsal view.

Abbreviations

TMNH	China, Tianjin, Tianjin, Tianjin Museum of Natural History
ZSM	Germany, Muenchen [= Munich], Zoologische Staatssammlung
TMNH	Tianjin Museum of Natural History
ZSM	Bavarian State Collection of Zoology