Orasema acuminata Baker & Heraty 2020

Orasema acuminata species group

(Figs 26–28)

Diagnosis. Recognized by the following combination of characters: antenna with 7 funiculars (Figs 27D, E, 28D),

mesoscutum and mesoscutellum coarsely rugose-areolate and mesoscutum in dorsal view with curvature of lateral lobe discontinuous with curvature of midlobe (Figs 27F, 28G), eyes bare (Figs 27B, 28B), antecostal sulcus smooth (Fig. 28E).

Description. Female. Length 2.6–3.7 mm. Color. Scape yellow; anellus pale brown; flagellum dark brown. Mandible pale brown with dark edges; maxilla and labium pale brown. Coxae brown with iridescence; tibiae yellow. Fore wing hyaline; venation pale brown. Petiole same as mesosoma; gaster dark brown with iridescence. Head. Head in frontal view subtriangular; scrobal depression shallow, laterally rounded, with transverse striae; longitudinal groove between eye and torulus absent; eyes bare; clypeus smooth; epistomal sulcus vaguely defined; anterior tentorial pits deeply impressed. Labrum with 4 digits. Mandibular formula 3:2; palpal formula 3:2. Occiput imbricate, emarginate in dorsal view, dorsal margin rounded; temples present. Scape not reaching median ocellus. Pedicle small and globose. Flagellum with 7 funiculars; anellus disc-shaped. Mesosoma. Mesoscutal midlobe rugose-areolate, moderately setose; lateral lobe rugose-areolate, curvature of lateral lobes discontinuous with curvature of midlobe in dorsal view; notauli deep. Axilla rugose-areolate; scutoscutellar sulcus broad, regularly foveate; mesoscutellar disc as long as broad, rugose-areolate; frenum and axillula rugose-areolate. Propodeal disc flat, without depression or carina, areolate; callus areolate, with several long setae. Propleuron convex, imbricate. Prepectus triangular dorsally, strongly narrowed ventrally, rugose-areolate. Mesepisternum areolate, broadly rounded anterior to mid coxa; postpectal carina weak. Transepimeral sulcus distinct. Hind femur densely setose laterally. Fore wing with marginal fringe relatively long; marginal vein setose; stigmal vein slightly longer than broad; postmarginal vein several times longer than stigmal vein. Hind wing costal cell setose. Metasoma. Petiole cylindrical, linear in profile, rugose, ventral sulcus absent. Antecostal sulcus smooth; acrosternite posteriorly rounded (Fig. 28E).

Male. Length 2.6–3.2 mm. (Known only for O. acuminata).

Phylogenetics. Only one species, O. acuminata, has been sampled for molecular data, and was referred to as “ Orasema _nsp_nr_brasiliensis_PER_AE_D4889” by Baker et al. (2020). This species was the sister to the majority of the Orasema xanthopus group in most analyses (Baker et al. 2020).

Key to species of the Orasema acuminata species group

1) Clava strongly pointed (Fig. 27D, E); sculpture on face more rugose than reticulate (Fig. 27B); upper mesepimeron areolate (Fig. 27C); femora mostly light brown (Fig. 27A); body color green-blue-purple (Ecuador and Peru)................................................................................................... Orasema acuminata n. sp.

- Clava subovate (Fig. 28D); sculpture on face more reticulate than rugose (Fig. 28B); upper mesepimeron smooth (Fig. 28C); femora dark brown (Fig. 28A); body color dark blue (Honduras).............................. Orasema cerulea n. sp.