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

Orasema roppai n. sp.

urn:lsid:zoobank.org:act:37EF90A1-3707-4E17-82A0-D59705456BDE

( Fig. 44 )

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

Description. Female. Length 3.2–3.8 mm ( Fig. 44A ). 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 ). 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 ). Mesosoma ( Fig. 44C, F ). 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 ); 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 ). 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 ). 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] . 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] . 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] .

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.

Figures

FIGURE 38. Distribution map of unplaced Orasema species.

FIGURE 44. Orasema roppai. Holotype female (UCRCENT00415610): A, habitus, lateral; B, head, anterior; C, mesosoma, lateral; D, antenna; F, mesosoma, dorsal; G, propodeum, posterior. Paratype male (UCRCENT00436518): E, antenna.