Carinopius

Tan, Jiang-Li, Tan, Qing-Qing, Achterberg, Cornelis Van & Chen, Xue-Xin, 2016, A new genus Carinopius gen. n. of the subfamily Opiinae (Hymenoptera, Braconidae) from China and Vietnam, with description of a new species, Zootaxa 4061 (5), pp. 569-574 : 570-572

Carinopius Tan & van Achterberg, gen. n.

( Figs 1–11 )

Etymology. The specific name is derived from “carina” (Latin for “crest”) and the generic name Opius Wesmael, 1835 , referring to the dorsally angulate occipital carina and its relation to Opius s.l. Gender: masculine. Type species. Carinopius albocoxalis Tan & van Achterberg, sp. nov.

Diagnosis. Clypeus nearly truncate ventrally and with small hypoclypeal depression ( Fig. 2 ); subocular depression present along posterior and dorsal margins of eye ( Figs 3–4 ); occipital carina narrowly angulate dorsolaterally and largely absent dorsally ( Fig. 3 ); temples and vertex punctate and/or coriaceous, without transverse rugulae ( Figs 3–4 ); area behind stemmaticum with a pit ( Fig. 2 ); mesosoma about twice as long as high, distinctly flattened in lateral view ( Fig. 7 ); mesoscutum longer than wide in dorsal view and without medio-posterior depression ( Fig. 8 ); precoxal sulcus sloping downwards posteriorly ( Fig. 7 ); mesepimeral flange widened near pleural scrobe ( Fig. 7 ); lateral carina of mesoscutum absent in front of tegulae ( Fig. 7 ); notauli largely absent ( Fig. 8 ); scutellar sulcus curved, but laterally reduced ( Fig. 8 ); metanotum protruding medio-posteriorly and median carina incomplete ( Fig. 9 ); vein m-cu of hind wing absent; vein M+CU1 of fore wing tubular; veins 1-M and cu-a of fore wing oblique; vein r of fore wing rather long ( Fig. 6 ); propodeum, metasomal tergites I–II and base of tergite III distinctly sculptured; dorsal carinae of tergite I united near base of tergite and continued as median carina posteriorly ( Fig. 9 ), dorsope absent, laterope distinctly impressed and glymma crenulate ( Figs 9, 11 ); metasomal tergite II as long as tergite III ( Fig. 9 ); tergites IV–VI well exposed, smooth and without a sharp lateral crease; tergites III-IV protruding latero-posteriorly ( Fig. 11 ); hypopygium medium-sized and subtruncate ventro-apically ( Fig. 11 ). The new genus is the superficially similar to Opiolastes van Achterberg & Chen (e.g. the curved scutellar sulcus, the dorsal carinae of tergite I united near base of tergite, vein M+CU1 of fore wing tubular, well exposed metasomal tergites IV-VI), but differs by having tergites IV–VI smooth (sculptured in Opiolastes ), and without a sharp lateral crease (present), tergites III–IV protruding latero-posteriorly (truncate), metanotum protruding medioposteriorly (truncate) and median carina incomplete (complete), lateral carina absent in front of tegulae (present), temples and vertex without transverse rugulae (present), the notauli largely absent (present), vein r of fore wing rather long (short) and vein m-cu of hind wing absent (present).

The genus will run in the key to world genera of Opiinae by Wharton (1997) to the genus Opius Wesmael 1835 s.l., as it does in the key by Fischer (1972). In the latter key it runs to the subgenus Phlebosema Fischer, 1972, and in Fischer (1972, 1987), Chen & Weng (2005) and Tobias (1988) no species were found matching the new species. In the key to Chinese genera of Opiinae by Li et al. (2013) the genus runs to the genus Phaedrotoma Foerster, 1863 , because the genus Opius is used sensu stricto. The new genus can be separated from both genera as follows:

1. Occipital carina angulate dorso-laterally and largely absent dorsally ( Figs 3–4 ); along posterior and dorsal margins of eye with subocular depression ( Fig. 3 ); metasomal tergites III-IV protruding latero-posteriorly ( Fig. 11 ); mesepimeral flange distinctly widened near pleural scrobe ( Fig. 7 ); mesosoma distinctly flattened in lateral view ( Fig. 7 ); mesoscutum longer than wide in dorsal view ( Fig. 8 )................................................ Carinopius Tan & van Achterberg, gen. n.

- Occipital carina evenly curved dorso-laterally; subocular depression absent; tergites III-IV truncate latero-posteriorly; mesepimeral flange hardly or not widened near pleural scrobe; mesosoma convex in lateral view; mesoscutum shorter than wide in dorsal view.......................................................................................... 2

2. Mandible asymmetrical (excluding ventro-basal carina), basal half more or less tooth-like widened, apical half of mandible comparatively narrow and resulting in smaller teeth..................................... Opius Wesmael, 1835 s. s.

- Mandible symmetrical (excluding ventro-basal carina), basal half without tooth-like protuberance, and apical half of mandible comparatively wide and with larger teeth........................................... Phaedrotoma Foerster, 1863

Figures

FIGURE 1. Carinopius albocoxalis Tan & van Achterberg, sp. nov., habitus, lateral aspect.

FIGURES 2 – 11. Carinopius albocoxalis Tan & van Achterberg, sp. nov., holotype, ♀. 2 — head, anterior aspect. 3 — head, dorsal aspect. 4 — head, lateral aspect. 5 — left mandible. 6 — left wings; 7 — mesosoma, lateral aspect. 8 — mesosoma, dorsal aspect. 9 — propodeum and metasomal tergites I – III, dorsal aspect. 10 — left hind leg. 11 — metasoma, lateral aspect.