Dolichochorus, Strobl, 1904

Broad, Gavin R. & Watanabe, Kyohei, 2019, Dolichochorus Strobl 1904: a valid genus of Mesochorinae (Hymenoptera: Ichneumonidae: Mesochorinae), Zootaxa 4555 (4), pp. 523-530 : 525-526

Recognition of Dolichochorus

Mesochorinae can be recognised by the combination of the following character states:

- female ovipositor simple, thin;

- ovipositor sheaths glabrous, inflexible; - male parameres elongate, spine-like;

- first metasomal tergite with deep glymmae, meeting at a transparent 'window ' centrally;

- clypeus not or only weakly separated from the face;

- fore wing with either a large, rhombic areolet with the sides of similar length, or a narrower, obliquely rhombic areolet.

Dolichochorus ( Fig. 1 ) can be recognised by:

- the long face and clypeus, with the latter as high as wide ( Fig. 2 );

- the rather small fore wing areolet ( Fig. 3 ).

- the longitudinally striate postpetiole of the first metasomal tergite ( Fig. 5 );

- complete lateral longitudinal carinae on the first tergite ( Fig. 5 ).

Unlike most mesochorines, the claws of Dolichochorus are simple (claws can be pectinate or simple in Mesochorus ). In common with many mesochorines, the apex of the fore tibia has a distinct tooth on the outer edge, which invites confusion with Ctenopelmatinae ; although no ctenopelmatines possess all of the diagnostic features of Mesochorinae , many Perilissini have deep, fenestrate glymmae, with the clypeus poorly separated from the face, and a few have needle-like ovipositors or male parameres elongate, although in neither case developed to the same degree as in Mesochorinae .

Figures

FIGURE 1. Dolichochorus longiceps (Strobl) (specimen NHMUK010880738) habitus.

FIGURE 2. Dolichochorus longiceps (specimen NHMUK010880738) head, frontal view (left) and side view (right).

FIGURE 3. Dolichochorus longiceps (specimen NHMUK010880738) fore wing.

FIGURE 5. Dolichochorus longiceps (specimen NHMUK010880738) first metasomal segment.