Orasema monstrosa, 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 : 75-76

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Orasema monstrosa

n. sp.

Orasema monstrosa n. sp.


( Fig. 41 View FIGURE 41 )

Diagnosis. Distinguished from other Orasema by the following combination of characters: mandibles small with 2:2 mandibular formula ( Fig. 41B View FIGURE 41 ), labrum greatly reduced in size ( Fig. 41B View FIGURE 41 ), head and mesosoma densely setose ( Fig. 41B, C View FIGURE 41 ), antenna with 7 funiculars ( Fig. 41D View FIGURE 41 ), mesoscutal midlobe coarsely areolate ( Fig. 41E View FIGURE 41 ), and male body size large (female unknown).

Description. Male. Length 3.8 mm ( Fig. 41A View FIGURE 41 ). Color. Head and mesosoma dark green with iridescence. Scape pale brown; pedicel, anellus, and flagellum brown. Mandible, maxilla, and labium brown. Coxae brown with strong iridescence; femora brown; tibiae yellow. Wing venation yellowish. Gaster brown. Head ( Fig. 41B View FIGURE 41 ). Head in frontal view subtriangular, densely setose; HW:HH = 1.3; face rugose; scrobal depression shallow, laterally rounded, areolate; longitudinal groove between eye and torulus absent; eyes densely setose, IOD:EH = 1.5; MS:EH = 0.7; malar depression absent; supraclypeal area longer than broad, convex, with scattered punctations; clypeus smooth; epistomal sulcus distinct and sharply defined; anterior tentorial pit shallow; anteclypeus distinct, broadly rounded. Labrum with 4 digits, very minute. Mandibular formula 2:2; palpal formula 3:2. Occiput imbricate, shallowly emarginate in dorsal view, dorsal margin abrupt; temples present, rounded. Scape not reaching median ocellus. Pedicel globose. Flagellum with 7 funiculars, FL:HH = 2.0; anellus minute, difficult to distinguish; F2L:F2W = 1.6, F2L: F3L = 1.1; following funiculars subequal in length, equal in width; clava subcylindrical ( Fig. 41D View FIGURE 41 ). Mesosoma ( Fig. 41C, E View FIGURE 41 ). ML:MH = 1.5. Mesosoma densely setose. Mesoscutal midlobe rugose; lateral lobe finely rugose; notauli deep. Axilla weakly sculptured, dorsally rounded, on roughly same plane as mesoscutellum; scutoscutellar sulcus broad, irregularly foveate, broadly separated from transscutal articulation; mesoscutellar disc slightly longer than broad, areolate; frenal line as strong carina; frenum areolate; axillular sulcus absent; axillula rugose-areolate. Propodeal disc broadly rounded, without depression or carina, rugose ( Fig. 41F View FIGURE 41 ); callus rugose, densely setose. Propleuron convex, weakly sculptured. Prepectus areolate. Mesepisternum areolate-reticulate, broadly rounded anterior to mid coxa; postpectal carina prominent. Upper mesepimeron smooth; lower mesepimeron smooth to reticulate; transepimeral sulcus weakly defined. HCL:HCW = 2.2, with weak dorsolateral sculpture; HFL:HFW = 6.5, evenly covered with elongate, semi-erect setae. FWL:FWW = 2.5, FWL:ML = 2.2; basal area and speculum sparsely setose, wing disc densely setose; marginal fringe relatively long; submarginal vein with several long setae; marginal vein setose; stigmal vein as long as broad, slightly angled toward wing apex; postmarginal vein 3.2 as long as stigmal vein. Hind wing costal cell entirely setose. Metasoma. Petiole cylindrical, linear in profile, PTL:PTW = 6.2, PTL:HCL = 1.8, areolate, lateral margin rounded, ventral sulcus absent. Antecostal sulcus foveate to smooth posteriorly; acrosternite posteriorly angulate.

Female. Unknown.

Hosts. Unknown.

Plant associates. Unknown.

Distribution ( Fig. 38 View FIGURE 38 ). Venezuela: BO. Collected in April (one specimen).

Material Examined. Holotype. VENEZUELA. Bolívar: Auyan Tepuy Camp , 2075m, 54°6’7”N, 62°31’56”W, 19-25.iv.1994, L. Masner & J.L. Garcia, malaise trap [³, deposited in UCRC: UCRCENT00434585]. GoogleMaps

Etymology. From Latin monstrum meaning “monstrosity” and -osus meaning “full of” in reference to the large size and hairiness.

Phylogenetics. Orasema monstrosa , referred to as Orasema _nsp_”IS1”_ VEN _D4228” by Baker et al. (2020), is the only molecularly sampled unplaced taxon. It is sister to the sixaolae group ( Baker et al. 2020), but these two groups share very few morphological characters in common, therefore, this species was not included in the sixaolae group.