Orasema brachycephala, Baker & Heraty, 2020

Baker, Austin J. & Heraty, John M., 2020, The New World ant parasitoid genus Orasema (Hymenoptera: Eucharitidae), Zootaxa 4888 (1), pp. 1-84 : 44-46

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Orasema brachycephala

n. sp.

Orasema brachycephala n. sp.


( Fig. 22 View FIGURE 22 )

Diagnosis. Distinguished from other members of the sixaolae group by the relatively elongate antennal flagellomeres (F2L:F2W = 1.8), including a comparatively quadrate anellus ( Fig. 22D View FIGURE 22 ). Distinguished from O. sixaolae and O. nebula by the petiole being shorter in length than the hind coxa (female). Distinguished from O. tinalandia by more coarsely, reticulately sculptured mesoscutal lateral lobes and axillae ( Fig. 22E View FIGURE 22 ), and by the wider/deeper anterior tentorial pits ( Fig. 22B View FIGURE 22 ).

Description. Female. Length 2.2 mm ( Fig. 22A View FIGURE 22 ). Color. Head and mesosoma dark brown with bluish iridescence. Mandible pale brown, darkened near edge. Femora and tibiae pale brown. Head ( Fig. 22B View FIGURE 22 ). Head in frontal view subovoid; HW:HH = 1.4; face weakly reticulate, nearly smooth; longitudinal groove between eye and torulus absent; eyes sparsely setose, IOD:EH = 1.4; MS:EH = 0.5; malar depression weakly impressed adjacent to mouth; supraclypeal area slightly broader than long, nearly smooth; clypeus shallowly imbricate; epistomal sulcus distinct and sharply defined. Labrum with 4 digits. Mandibular formula not observed; palpal formula 2:2. Occiput with dorsal margin evenly rounded; temples absent. Pedicel globose, broader than F1. FL:HH = 1.7; anellus large; F2L: F2W = 1.8, F2L:F3L = 1.0; following funiculars subequal in length, equal in width; clava subovate ( Fig. 22D View FIGURE 22 ). Mesosoma ( Fig. 22C, E View FIGURE 22 ). ML:MH = 1.7. Mesoscutal midlobe weakly reticulate, sparsely setose; lateral lobe weakly reticulate. Axilla weakly reticulate; scutoscutellar sulcus broad, irregularly foveate, broadly separated from transscutal articulation; mesoscutellar disc as long as broad, weakly reticulate to smooth; frenal line as smooth band; axillular sulcus indicated by a strong longitudinal carina. Propodeal disc areolate-reticulate, with irregular median carina, smooth laterally ( Fig. 22F View FIGURE 22 ); callus with several long setae on dorsal margin. Propleuron weakly reticulate. Prepectus mostly smooth. Mesepisternum reticulate. HCL:HCW = 2.2; HFL:HFW = 4.2, evenly covered with short, dense setae. FWL:FWW = 2.1, FWL:ML = 2.3; entirely setose, wing disc densely setose; submarginal vein with several long setae; stigmal vein perpendicular to anterior wing margin; postmarginal vein several times longer than stigmal vein. Hind wing costal cell with only 1 or 2 irregular rows of setae. Metasoma. PTL:PTW = 1.7, PTL:HCL = 0.7, areolate-reticulate, lateral margin rounded, ventral sulcus present with margins broadly separated. Antecostal sulcus foveate; acrosternite posteriorly rounded; apical setae of hypopygium with several long hairs on each side of midline. Ovipositor not visible.

Male. Unknown.

Hosts. Unknown.

Plant associates. Unknown.

Distribution ( Fig. 21 View FIGURE 21 ). Brazil: RJ. Collected in January (one specimen)

Material examined. Holotype. BRAZIL. Rio de Janeiro: Gunabara Floresta de Tijuca , 22 ° 55’48”S, 43 ° 14’24”W, i.1974, M. Alvarenga [♀, deposited in CNC: UCRCENT00247554]. GoogleMaps

Etymology. From Greek brachy meaning “short” and cephal meaning “head” in reference to the relatively short/wide face.