Orasema roppai, 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 : 80-82

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Orasema roppai

n. sp.

Orasema roppai n. sp.


( Fig. 44 View FIGURE 44 )

Diagnosis. Distinguished from other Orasema by the following combination of characters: antenna with 8 funiculars ( Fig. 44D, E View FIGURE 44 ); labrum with 4 digits ( Fig. 44B View FIGURE 44 ); face, mesoscutum, and mesoscutellum entirely rugose-reticulate ( Fig. 44B, F View FIGURE 44 ); eyes setose ( Fig. 44B View FIGURE 44 ); axillular sulcus strong and complete ( Fig. 44F View FIGURE 44 ); face more subquadrate than subtriangular (HW:HH = 1.0–1.1).

Description. Female. Length 3.2–3.8 mm ( Fig. 44A View FIGURE 44 ). Color. Head and mesosoma iridescent blue-green. Scape, pedicle, and anellus yellow; flagellum dark brown. Mandible yellowish brown; maxilla and labium pale brown. Coxae dark brown; femora entirely yellow or light brown proximally, yellow distally; tibiae yellow. Fore wing hyaline; venation pale brown. Petiole same as mesosoma; gaster dark brown with iridescence. Head ( Fig. 44B View FIGURE 44 ). Head in frontal view subquadrate; HW:HH = 1.0–1.1; face rugose-reticulate; scrobal depression shallow, laterally rounded, with transverse striae; longitudinal groove between eye and torulus absent; eyes densely setose, IOD:EH = 1.4–1.6; MS:EH = 0.7–0.9; malar depression weakly impressed adjacent to mouth; supraclypeal area slightly longer than broad, weakly sculptured; clypeus smooth; epistomal sulcus vaguely defined; anterior tentorial pit strongly impressed; anteclypeus distinct, nearly straight. Labrum with 4 digits. Mandibular formula not observed; palpal formula 3:3. Occiput imbricate, deeply emarginate in dorsal view, dorsal margin rounded; temples present. Scape not reaching median ocellus. Pedicle small and globose. Flagellum with 8 funiculars; FL:HH = 1.1–1.4; anellus disc-shaped; F2L:F2W = 1.5–2.0, F2L:F3L = 1.1–1.4; following funiculars subequal in length, equal in width; clava subovate ( Fig. 44D View FIGURE 44 ). Mesosoma ( Fig. 44C, F View FIGURE 44 ). ML:MH = 1.4–1.7. Mesoscutal midlobe rugose-reticulate, densely setose; lateral lobe rugose-reticulate; notauli deep. Axilla rugose-reticulate, dorsally flat, on same plane as mesoscutellum; scutoscutellar sulcus broad, irregularly foveate, reaching transscutal articulation; mesoscutellar disc as long as broad, rugose-reticulate; frenal line regularly foveate; frenum rugose-reticulate; axillular sulcus indicated by a strong lateral carina; axillula rugose. Propodeal disc flat, without depression or carina, areolate-reticulate ( Fig. 44G View FIGURE 44 ); callus rugose-reticulate, with several long setae. Propleuron convex, weakly reticulate. Prepectus triangular dorsally, strongly narrowed ventrally, rugose-reticulate. Mesepisternum reticulate laterally, smooth ventrally, broadly rounded anterior to mid coxa; postpectal carina weak. Upper and lower mesepimeron reticulate to smooth; transepimeral sulcus distinct. Metepisternum laterally reticulate. HCL:HCW = 1.5–1.7, reticulate dorsally, becoming smooth ventrally; HFL:HFW = 3.8–4.7, with short dense setae dorsally, and fewer longer setae ventrally. FWL: FWW = 2.6–2.9, FWL:ML = 1.9–2.2; basal area and speculum bare, costal cell and wing disc densely setose; marginal fringe relatively long; submarginal vein with small setae; marginal vein densely setose; stigmal vein about twice as long as broad, slightly angled toward wing apex; postmarginal vein several times longer than stigmal vein. Hind wing costal cell with a broad bare area. Metasoma. Petiole cylindrical, linear in profile, PTL:PTW = 1.6–2.0, PTL:HCL = 0.8–1.0, areolate-reticulate, lateral margin rounded, ventral sulcus absent. Antecostal sulcus foveate; acrosternite posteriorly rounded; apical setae of hypopygium with one pair of setae much longer than the others. Ovipositor not visible.

Male. Length 2.1–2.7 mm. HW:HH = 1.0–1.2; scape yellow; flagellum with 8 or 9 funiculars (one specimen with complete antennae has a different count on either antenna), FL:HH = 1.6–1.7; anellus disc-shaped; F2L:F2W = 1.5–1.9 ( Fig. 44E View FIGURE 44 ). Femora brown proximally, yellow distally; tibiae yellow. PTL:PTW = 2.8–3.4, PTL:HCL = 1.3–1.6.

Hosts. Unknown.

Plant associates. Unknown.

Distribution ( Fig. 38 View FIGURE 38 ). Argentina: MN; Brazil: RS. Collected in November–December.

Material examined. Holotype. BRAZIL. Rio Grande do Sul: S. Augusto, 511m, 27 ° 51’29”S, 53 ° 46’49”W, xii.1975, O.Roppa [♀, deposited in CNC:UCRCENT00415610] GoogleMaps . Paratypes. ARGENTINA. Misiones : Puerto Rico, 26 ° 48’41”S, 55 ° 01’39”W, 5-13.xi.1970, C. Porter & L. Stange, Malaise Trap [1³, IFML: UCRCENT00436518] GoogleMaps . BRAZIL. Rio Grande do Sul: S. Augusto, 511m, 27 ° 51’29”S, 53 ° 46’49”W, 19.xii.1975, O. Roppa [1³ 14♀, CNC: UCRCENT00321008–11, UCRCENT00415379–84, UCRCENT00415608–09, UCRCENT00415611–12, ROME: UCRCENT00418056] GoogleMaps .

Etymology. Named in honor of the collector of most of the specimens of this species, O. Roppa.

Discussion. This species shares many similarities with O. brasiliensis , but has 8 rather than 7 funiculars and a different head shape. It shares some similarities with the stramineipes species group, but the head shape and antenna shape do not match the other members of that group.