Apoclima brevicauda, Watanabe, 2023

Watanabe, Kyohei, 2023, Taxonomic and Zoogeographic Notes on Japanese Orthocentrinae (Hymenoptera, Ichneumonidae), with Descriptions of Four New Species, Bulletin of the Kanagawa Prefectural Museum (Natural Science) 52, pp. 7-44 : 14

Apoclima brevicauda sp. nov.

[New SJN: Ezo-chibi-hae-himebachi]

( Figs. 4A–E, 22A, F)

Type series. Holotype: JAPAN: NARO, F, Hokkaido, Sapporo City, Misumai, Kannon-zawa , 17–30. VII. 1993, N. Kuhara leg. (MsT) . Paratypes: JAPAN: NARO, 2 M, Hokkaido, Sapporo City, Misumai, Kannon-zawa , 16–27. VII. 1992, N. Kuhara leg. (MsT) ; NARO, 3 M, ditto, 23. VI. – 4. VII. 1993 ; NARO, 2 F & 9 M, same data of holotype ; NARO, F, ditto, 7–21. IX. 1993 ; EUM, 3 F & 1 M, Hokkaido, Yuni , Kuobetsu-gawa R., 2–12. VII. 2007, N. Kuhara leg. (MsT).

Diagnosis. FL I 4.0 (female) or 3.3–3.6 (male) times as long as maximum depth in lateral view. Ovipositor short, its sheath 0.7–0.85 times as long as hind tibia. T II 0.55–0.6 times as long as maximum width. Notch of male FL III strong, with sharply projecting tooth with two short setae, these setae shorter than the height of tooth. Male flagellum with 18–19 segments. Coxae reddish yellow to yellow.

Description. Female (n = 7). Body length 3.3–4.05 ( HT: 3.7) mm, polished and covered with silver setae.

Head 0.7–0.75 ( HT: 0.7) times as long as wide. Clypeus 2.2–2.3 ( HT: 2.2) times as broad as high, reticulate coriaceous. Supraclypeal groove deep. Face 1.7–1.8 ( HT: 1.7) times as broad as high, reticulate coriaceous, weakly convex medially in lateral view. Malar space 2.4–2.6 ( HT: 2.6) times as long as basal mandibular width. POL 1.2–1.6 ( HT: 1.6) times as long as OD. OOL 1.1–1.4 ( HT: 1.4) times as long as OD. Inner eye orbit almost parallel. Occipital carina absent dorso-medially ( Fig. 22A). Vertex reticulate coriaceous, weakly concave medially. Gena reticulate coriaceous. Mandible strongly twisted, upper tooth slightly longer than lower tooth. Flagellum with 17–18 ( HT: 18) segments, all segments longer than its maximum depth in lateral view. FL I 4.0 times as long as maximum depth in lateral view and 1.2–1.25 ( HT: 1.25) times as long as FL II.

Mesosoma reticulate coriaceous (sculpture on mesoscutum, metapleuron, and propodeum denser than other parts and thus these parts apparently matt). Mesoscutum with distinct notaulus, its posterior end situated near the middle of mesoscutum. Scutellum largely smooth. Speculum with a conspicuous smooth area. Propodeum with all carinae except for anterior transverse carina. Fore wing length 3.3–3.8 ( HT: 3.7) mm. Vein rs-m of fore wing short. Vein 1cu-a of fore wing slightly postfurcal. Vein 2r&RS of fore wing extends from pterostigma for its middle. Hind wing with nervellus intercepted behind or near the middle. Hind femur 4.6–5.2 ( HT: 5.0) times as long as maximum depth in lateral view. Hind TS I 2.1–2.3 ( HT: 2.3) times as long as TS II. Hind TS II 4.0 times as long as maximum depth in lateral view. Tarsal claws simple.

Metasoma. T I 1.2–1.3 ( HT: 1.2) times as long as maximum width, densely reticulate coriaceous (apparently matt) ( Fig. 4C), strongly convex medially. T II 0.55–0.6 ( HT: 0.6) times as long as maximum width, reticulate coriaceous anteriorly, smooth posteriorly ( Fig. 4C), with a pair of narrow thrydia. T II to T VII largely smooth. Ovipositor sheath 0.26–0.28 ( HT: 0.28) times as long as fore wing and 0.7–0.85 ( HT: 0.85) times as long as hind tibia.

Coloration ( Figs. 4A–C). Body (excluding wings and legs) black to blackish brown. Mandible, basal segments of antenna, thridium, posterior part of T II, and ovipositor yellowish brown. Tegula brown. Palpi and membranous sections of metasomal sternites whitish yellow. Wings hyaline. Veins and pterostigma pale brown to brown. Legs reddish yellow to yellow. Brownish or yellowish areas of Tegula and T II sometimes indistinct.

Male (n = 15). Similar to female. Clypeus 2.05–2.2 × as broad as high. Face 1.5–1.55 × as broad as high. Malar space 0.95–1.05 × as long as basal mandibular width. Flagellum with 18–19 segments. FL I 3.3–3.6 times as long as maximum depth in lateral view and 1.1 times as long as FL II. FL III with strong notch and sharply projecting tooth ( Fig. 22F). Tooth of FL III with two short setae, its shorter than the height of tooth ( Fig. 22F). T I 0.7–0.75 × as long as maximum width. T II 0.75–0.85 × as long as maximum width.

Distribution. Japan (Hokkaido).

Etymology. The specific name is from the Latin brevi - (short) plus cauda (tail). This species has a short ovipositor.

Remarks. This species resembles A. signaticorne but can be distinguished from the ovipositor sheath distinctly shorter than the hind tibia (as long as in A. signaticorne ) and the tooth of FL III with two short setae shorter than the height of teeth (with long setae, its longer than the height of teeth in A. signaticorne ).