Canalopius Wu & van Achterberg, 2018

Wu, Qiong, Achterberg, Cornelis van, Sheng, Ying-yi & Chen, Xue-xin, 2018, A new genus from Vietnam (Hymenoptera, Braconidae, Opiinae), and the description of two new species, Journal of Hymenoptera Research 66, pp. 1-13 : 1

Canalopius Wu & van Achterberg gen. n.

Figs 1 , 2-11

Type species.

Canalopius periscopus sp. n.

Etymology.

From “canalis” (Latin for "groove, channel") and the generic name Opius , because of the channel-like groove of the occiput. Gender: masculine.

Diagnosis.

Vertex and occiput with very deep medial groove up to between posterior ocelli; vertex depressed near posterior ocelli; stemmaticum reversed “Y” - shaped, abruptly protruding and with anterior ocellus on anterior branch far above frons (Figs 1b-e , 5 , 8 ); anterior ocellus close to level of antennal sockets and distance between anterior ocellus and posterior ocellus nearly twice distance between posterior ocelli; anterior ocellus on protruding crest; occipital carina entirely absent; mandible slightly twisted, its basal half dorsally and ventrally with fine carina, nearly straight ventrally, apically gradually narrowed and with second teeth much smaller than first tooth (Figs 2 , 4 ); precoxal sulcus present medially; medio-posterior depression of mesoscutum absent; dorsal surface of propodeum narrow, coarsely crenulate in front of curved carina, and medio-longitudinal carina complete; vein 2-SR of fore wing present; base of hind tibia without carinula at inner side and setose; legs robust (Fig. 1a ); dorsope absent; second slightly shorter than third tergite and both smooth; ovipositor sheath short, hardly protruding.

Distribution.

Oriental (Vietnam).

Biology.

Unknown.

Notes.

The new genus will run in the key to world genera by Wharton (1997) and the key to Chinese genera by Chen and Weng (2005) to the genus Opius Wesmael, 1835; in the key by Fischer (1972) it ends up at Desmiostoma Foerster, 1863, because of the absence of an occipital carina. In Li et al. (2013) it runs to Rhogadopsis Brèthes, 1913, because of the venation and the medio-longitudinal carina of the propodeum. The new genus can be separated from all known genera as follows:

1	Anterior ocellus close to level of antennal sockets and distance between anterior ocellus and posterior ocellus nearly twice distance between posterior ocelli; anterior ocellus on protruding crest; occiput with deep median groove; occipital carina absent laterally; transverse carina of propodeum present	Canalopius Wu & van Achterberg, gen. n.
-	Anterior ocellus distinctly removed from level of antennal sockets and distance between anterior ocellus and posterior ocellus similar to distance between posterior ocelli; anterior ocellus without crest; occiput without median groove; occipital carina usually present laterally, if absent ( Desmiostoma and some Opius spp.) then also transverse carina of propodeum lacking	other genera of Opiinae

Figures

Figure 1. Canalopius periscopus sp. n., ♀, holotype. a habitus, lateral aspect b-e stemmaticum and median furrow of vertex at different angles.

Figures 2 - 11. Canalopius periscopus sp. n., ♀, holotype. 2 fore wing 3 hind wing 4 head and mesosoma, lateral aspect 5 head and mesosoma, dorsal aspect 6 propodeum and first third metasomal tergites, dorsal aspect 7 head, anterior aspect 8 head, dorsal aspect 9 head, lateral aspect 10 antenna 11 hind leg, lateral aspect.