Acrolyta japonica Watanabe, 2021, sp. nov.
Creators: name: Watanabe, Kyohei
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Acrolyta
Acrolyta japonica

description: Acrolyta japonica sp. nov.
(New SJN: Tatesuji-mame-togari-himebachi)
(Figs 4A–E, 62F, N, 63A, 65A, 66A)
Etymology. The specific name is from Japan.
Type series. Holotype: KPM-NK 54996, F, JAPAN, Hokkaido, Horokanai Town, Moshiri, Uryu, 16. VII. 2012, M. Ito leg. Paratypes: JAPAN, KPM-NK 54998–54500, 3 F, same data of holotype; KPM-NK 54997, F, ditto, 16. VII. 2012; KPM-NK 54501, 54502, 2 F, ditto, 17. VII. 2012, K. Watanabe leg.; KPM-NK 54503, Niigata Pref., Sado Is., Sado City, Kanaisinbo, Hakuundai to Mt. Myokenzan, 4. VIII. 2009, K. Watanabe leg.; KPM-NK 54504, F, Yamanashi Pref., Koushu City, Sagashio, 4. VIII. 2009, K. Watanabe leg.; KPM-NK 54505, F, Yamanashi Pref., Koushu City, Kaminikkawa-toge, 8. VI. 2009, T. Kidokoro leg.
Description. Female (n=10). Body length 3.5–4.7 (HT: 4.2) mm. Body covered with silver setae.
Head. Clypeus 2.0–2.1 (HT: 2.0) times as wide as maximum length, its anterior margin subtruncate, without distinct teeth anteromedially. Face granulate (Fig. 4B). MSL 0.9–1.0 (HT: 1.0) times as long as BWM. Malar space polished except for coriaceous anterior part. Frons and anterior part of vertex matt except for smooth area above antennal sockets. Posterior part of vertex and gena polished, with fine and sparse punctures. OOL almost as long as POL. Occipital carina complete, joined with hypostomal carina near mandibular base. Upper tooth of mandible slightly longer than lower tooth. Base of mandible weakly convex. Antenna with 21–24 (HT: 24) flagellomeres, median and subapical parts slightly widened (Fig. 4A), the most widened part ca. 2.0 times as long as maximum depth of FL I in lateral view. FL I, FL II, and FL III distinctly longer than other segments (Fig. 62N). FL III 3.8–4.0 (HT: 3.8) times as long as maximum depth in lateral view.
Mesosoma. Lateral part of pronotum largely smooth, with epomia (Fig. 4D). Mesoscutum matt and subpolished, with distinct notaulus (Fig. 4C). Scutellum polished, punctate (Fig. 4C). Mesopleuron smooth, with some longitudinal striae ventrally (Fig. 4D). Metapleuron punctate except for median smooth area, with a complete juxtacoxal carina (Fig. 4D). Anterior and posterior transverse carinae of propodeum complete (Fig. 65A). Area basalis distinct (Fig. 65A). Area superomedia distinct or indistinct laterally (Fig. 65A). Anterior part of propodeum finely and sparsely punctate. Median and posterior parts of propodeum covered with longitudinal, oblique and irregular rugae. Length of fore wing 3.4–4.6 (HT: 3.7) mm. Areolet absent (Fig. 4E). Vein 2m-cu of fore wing with two bullae. Nervellus inclivous, intercepted behind the middle (Fig. 4E). Hind femur 4.7–5.1 (HT: 5.1) times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.95–1.0 (HT: 1.0): 0.7: 0.3: 0.4–0.5 (HT: 0.45). Tarsal claws simple.
Metasoma. T I 1.7–1.8 (HT: 1.7) times as long as maximum width, longitudinally striated (Fig. 4C). Median dorsal carina of T I present except for posterior part absent. Dorsolateral carina of T I complete. T II and T III covered with longitudinal striae except for smooth areas (Fig. 4C). T IV and T V sparsely punctate except for posterior smooth areas. Ovipositor sheath 0.63–0.70 (HT: 0.68) times as long as hind tibia. Ovipositor straight, with a nodus and ventral teeth (Fig. 66A).
Coloration (Figs 4A–E). Body (excluding wings and legs) black to blackish brown. Ventral parts of scape and pedicel, and base of FL I reddish brown. Mandible yellow except for darkened apex. Palpi, postero-dorsal corner of pronotum, and tegula yellow. Posterior margin of metasomal tergites (it of T II to T IV wider than other tergites), lateral parts of T II to T IV, and thyridium reddish brown. Membranous part of metasomal sternites and ovipositor reddish brown. Wings hyaline. Veins and pterostigma yellowish brown to brown. Legs reddish brown to yellowish brown. Fore and mid coxae, trochanters, and trochantelli yellow. Base of hind coxa, base and apical parts of hind tibia, and apical part of hind tarsus more or less tinged with blackish brown.
Male. Unknown.
Distribution. Japan (Hokkaido, Honshu, and Sado Is.).
Bionomics. Unknown.
Remarks. This species resembles Acr. marginata (Bridgman, 1883) in the body structures, but it can be distinguished by the FL III 3.8–4.0 times as long as maximum width (4.4–4.6 in Acr. marginata).
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 61-62, DOI: 10.32225/bkpmnh.2021.50_55, http://zenodo.org/record/12774639