Striastigmus Rasplus, Boehmova & Jansta, 2022

Boehmova, Julie, Rasplus, Jean-Yves, Taylor, Gary S. & Jansta, Petr, 2022, Description of two new Australian genera of Megastigmidae (Hymenoptera, Chalcidoidea) with notes on the biology of the genus Bortesia, Journal of Hymenoptera Research 90, pp. 75-99 : 75

Striastigmus Rasplus, Boehmova & Jansta gen. nov.

Fig. 1A-G

Type species.

Striastigmus bicoloratus Rasplus, Böhmová & Janšta, sp. nov., by present designation.

Etymology.

The generic name is composed of the Latin prefix stria, referring to the dense striation covering most of the body and stigmus referring to the large stigma of Megastigmidae . Masculine gender.

Diagnosis.

Recognized from other Megastigmidae by having circular head shape with concentric striated sculpture on most of face (Fig. 1D ). Toruli situated low on head with lower margin slightly above lower margin of eyes (Fig. 1D ). Scrobes shallow, smooth and narrowly triangular, not reaching median ocellus (Fig. 1D ). Most setation on upper face long and black, shorter and white on lower face. Gena smooth and shiny (Fig. 1C ). Occipital carina raised, sharp, its dorsal part reaching vertex (Fig. 1A ). Antenna slightly clavate with a conspicuous micropilosity area on last clavomere (Fig. 1E ). Pronotum elongated, collar margined and more than half as long as mesoscutum (Fig. 1B ). Anterior half of collar with ten transverse carinae (Fig. 1B ). Mesoscutum coarsely cross striated (Fig. 1B ). Mesoscutellum delimited anterolaterally from mesoscutum and axillae by broad foveate-septated scutoscutellar sulcus separating axillae (Fig. 1B ). Frenum coarsely reticulated, extending on about half length of mesoscutellum (Fig. 1B ). Propodeum relatively long, area between spiracles coarsely cross striated in proximal part, striate in distal part of propodeum medially turning backwards to propodeal foramen (Fig. 1G ). Mesosoma dorsally with scarce long black setae, three long white setae laterally on pronotal collar, one on mesoscutal lateral lobe and three smaller ones on axilla along scutoscutellar suture (Fig. 1B ). Hind coxa bare dorsally. Fore wing with marginal vein about as long as postmarginal vein, stigma enlarged, ovoid, basal vein present (Fig. 1F ). Petiole elongated, about 0.8 × as long as propodeum (Fig. 1G ). Metasoma, not including petiole, shorter than mesosoma, smooth or with traces of coriaceous sculpture laterally (Fig. 1A ), Gt1-2 medially slightly emarginated. Ovipositor upturned and slightly longer than the entire metasoma (Fig. 1A ).

In the key of Bouček (1988) Striastigmus goes to couplet 14 (page 120) but differs from Paramegastigmus Girault by having oval head with concentric striated sculpture on most of face, cross striated pronotum, mesonotum and propodeum, coarsely reticulated frenum, and bicolored petiole, mesoscutellum, metanotum and legs, as well as the bicolored setae on head and mesosoma.

Generic description.

Female. Same as for description of Striastigmus bicoloratus Rasplus, Böhmová & Janšta, sp. nov.

Host association.

Unknown. Swept from vegetation in rain forest.

Distribution.

Australia: Queensland.

Figures

Figure 1. Striastigmus bicoloratus holotype, female A habitus, lateral view B mesosoma, dorsal view C head and mesosoma, lateral view D head, frontal view E antenna, lateral view F venation G propodeum, dorsal view. Scale bars: 200 µm except for habitus (1 mm).