Aclastus etorofuensis
Creators: name: Watanabe, Kyohei
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Aclastus
Aclastus etorofuensis

description: Aclastus etorofuensis (Uchida, 1936)
(SJN: Etorofu-mame-togari-himebachi)
(Figs 38A–D, 65L)
Hemiteles (Opisthostenus) etorofuensis Uchida, 1936b: 43.
Description. Female (n=4). Body length 3.2–4.0 mm. Body polished, covered with silver setae.
Head. Clypeus 1.45–1.6 times as wide as maximum length, punctate except for smooth anterior part, its anterior margin rounded. Face punctate, with a small longitudinal smooth area medially. MSL 1.5–1.8 times as long as BWM. Frons, vertex, and gena finely punctate. OOL as long as or slightly longer than POL. OOL and POL distinctly longer than OD. Occipital carina complete, its lower end joined with hypostomal carina near mandibular base. Mandible strongly narrowed toward apex, slightly twisted. Upper tooth of mandible longer than lower tooth. Base of mandible flat. Antenna with 18–20 flagellomeres. FL I 5.7–8.0 times as long as maximum depth in lateral view. FL III 5.0–5.5 times as long as maximum depth in lateral view. The penultimate segments of flagellum distinctly longer than wide.
Mesosoma. Lateral part of pronotum largely smooth, with epomia. Mesoscutum and scutellum finely punctate, with notaulus. Mesopleuron smooth except for area finely punctate below speculum, with some setae along epicnemial carina and mesopleural suture. Epicnemial carina complete, its dorsal end reaching the anterior margin of mesopleuron. Posterior transverse carina of mesosternum largely absent laterally. Metapleuron largely smooth, with a complete juxtacoxal carina. Propodeum covered with weak irregular rugae. Propodeal carinae complete (Figs 38C, 65L). Area superomedia longer than wide, receiving the lateral section of anterior transverse carina anteriorly (Figs 38C, 65L). Areolet absent (Fig. 38A). Nervellus subvertical (Fig. 38A). Length of fore wing 2.9–3.7 mm. Hind femur 5.0–5.5 times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.9: 0.6: 0.3: 0.4. Tarsal claws simple.
Metasoma. T I 2.0–2.2 times as long as maximum width, covered with longitudinal striae (Fig. 38D). Median dorsal carina and dorsolateral carina of T I indistinct. T II shorter than maximum wide. T II and T III smooth (Fig. 38D) except for the punctures on the laterotergites. T IV to T VI covered with fine punctures posteriorly. Ovipositor sheath 0.53–0.65 times as long as hind tibia. Ovipositor straight except for slightly upcurved apical part, without a nodus and ventral teeth.
Coloration (Figs 38A–D). Body (excluding wings and legs) black to blackish brown. Clypeus and malar space more or less tinged with dark reddish brown. Scape and pedicel yellowish brown. Mandible whitish yellow except for darkened apex. Palpi whitish yellow. Mesosoma and T I usually partly tinged with reddish brown. Tegula yellowish brown. T II to T VII reddish yellow to reddish brown. Membranous part of metasomal sternites whitish yellow to reddish yellow. Ovipositor reddish brown. Wings hyaline. Veins and pterostigma yellowish brown to brown. Legs yellowish brown to reddish brown except for weakly darkened subbasal band and apical part of hind tibia.
Male. Not studied in this study.
Materials examined. JAPAN: SEHU, F (holotype), Etorofu Is., Shana, 11–20. VII. 1935, Y. Sugihara leg.; KPM-NK 81976, F, Hokkaido, Horokanai Town, Moshiri, Uryu, 11–17. VII. 2012, K. Watanabe et al. leg. (MsT); KPM-NK 81977, F, Aichi Pref., Shitara Town, Tsugu, Honsawa, 17. VI. 2019, S. Morishita leg.; KPM-NK 55020, F, Toyama Pref., Toyama City, Arimine, Jyurodani, 7–14. VII. 2009, M. Watanabe et al. leg. (MsT).
Distribution. Japan (Kunashiri Is., Etorofu Is., Hokkaido *, and Honshu), China, and Taiwan.
Bionomics. Unknown in Japan. In China, Cotesia ruficrus (Haliday, 1834) has been recorded as host (He, 1984; He et al., 1996).
Remarks. This is the first record of this species from Hokkaido.
description: Published as part of Watanabe, Kyohei, 2021, Taxonomic and Zoogeographic Study of the Japanese Phygadeuontinae (Hymenoptera, Ichneumonidae), with Descriptions of 17 New Species, pp. 55-136 in Bulletin of the Kanagawa Prefectural Museum (Natural Science) 50 on pages 98-99, DOI: 10.32225/bkpmnh.2021.50_55, http://zenodo.org/record/12774639