Trismegistomya Reinhard, 1967

Fleming, AJ, Wood, D. Monty, Smith, M. Alex, Dapkey, Tanya, Hallwachs, Winnie & Janzen, Daniel H, 2019, A new species of Trismegistomya Reinhard (Diptera: Tachinidae) from Area de Conservacion Guanacaste in northwestern Costa Rica, Biodiversity Data Journal 7, pp. 29130-29130 : 29130

Trismegistomya Reinhard, 1967

Trismegistomya Reinhard, 1967 - Reinhard 1967b:600, nomen novum for Trismegistus Reinhard, 1967.

Trismegistus Reinhard, 1967 - Reinhard 1967a:100, junior homonym of Trismegistus Johnson & Snyder, 1904.

Trismegistomya Trismegistus pumilis Reinhard, 1967 Reinhard 1967a: 100. by original designation

Description

Male. Head: strongly conical in shape, 1.3 × wider than tall in frontal view, in profile 1.35 × wider at level of pedicel than at level of vibrissa; fronto-orbital plate and parafacial dull grey-silver tomentose; frontal vitta of reddish-brown color, 1.2 × width of fronto-orbital plate; eye bare, occupying 0.75 × height of head; postpedicel 1.18 × pedicel; pedicel brilliant orange; arista slightly longer than postpedicel, abruptly tapered apically; antennal insertion level with middle of eye; gena almost 0.25 × height of eye, strong genal groove of deep dull red color, contrasting with silver gena; two pairs of vertical setae, inner vertical setae convergent, almost 2x as long as outer vertical setae, which are strongly divergent; ocellar setae weak but present and strongly divergent; fronto-orbital plate with single row of frontal setae, at most one frontal seta below upper margin of pedicel and two rows of short setulae outside of frontal setae; parafacial bearing one row of weak proclinate parafacial setae directly adjacent to facial ridge (so close that the facial ridge appears as setulose), appearing as a continuation of frontal setae; one row of scattered setulae on remainder of parafacial, extending to lower proclinate orbital seta; two pairs of proclinate orbital setae, one pair of lateraloclinate or reclinate upper orbital setae; palpus yellow-orange, only slightly haired. Thorax: entirely black; dorsally with a very slight grey tomentum presuturally, only visible under certain angles of light, otherwise appearing as glabrous black; chaetotaxy: three postpronotal setae arranged in a straight line; two notopleural setae; three postsutural acrostichal setae; 3-4 postsutural dorsocentral setae; 2-3 postsutural intra-alar setae; three postsutural supra-alar setae; 2-3 katepisternal setae; anepimeron bare, with 2-4 short and stout hair-like setae, lacking any strong elongate anepimeral setae; scutellum with 1-2 pairs oflateral setae; one pair of apical setae; discal scutellar setae ranging from one pair to absent. Wings: hyaline with a slight yellow tinge; bend of vein M obtuse, ending at wing margin; crossvein dm-cu slightly oblique; wing vein R4+5 bearing 4-6 setulae dorsally, extending 0.75 × distance from node to crossvein r-m. Legs: short and stout; entirely glabrous black, densely covered in appressed short setulae. Abdomen: ground color appearing glabrous reddish-black; very slight silver tomentum visible on anterior margins of tergites when viewed under different angles of light; mid-dorsal depression of ST1+2 extending only halfway across syntergite, not reaching tergal margin; marginals present only as a complete row of setae on both T4 and T5; one row of discal setae on T5. Females differ from males only in their terminalia.

Diagnosis

Trismegistomya is distinguished from other voriines by the following combination of characters: small, 3-3.5 mm long; habitus glabrous black, with only light tomentum presuturally only evident under certain angles of light; conical head profile with axis of pedicel subequal to head height; deeply excavated clypeus; vibrissa inserted above lower margin of face; yellowish wing reaching beyond tip of abdomen; abdomen ovate with mid-dorsal depression of ST1+2 not reaching tergal margin, possessing median marginal setae on T4 and T5 and median discal setae on T5 only.

Distribution

New World genus ranging from Arizona in the USA south to Costa Rica.