Orasema johnsoni, 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 : 61-63

Orasema johnsoni n. sp.

urn:lsid:zoobank.org:act:411E098B-BD75-40C5-A8DB-C220196F556B

( Fig. 33 )

Diagnosis. Distinguished from O. spyrogaster by features given in the key.

Description. Female. Length 2.1–2.9 mm ( Fig. 33A ). Color. Scape pale brown; flagellum brown. Fore coxa brown proximally, yellow distally; Mid and hind coxae brown with iridescence. Head ( Fig. 33B ). HW:HH = 1.2– 1.3; face smooth to weakly coriaceous; longitudinal groove between eye and torulus present, small; eyes densely setose, IOD:EH = 1.5–1.7; MS:EH = 0.6–0.8; malar depression weakly impressed between mouth and eye margin. Mandibular formula not observed. Temples present, rounded. Flagellum with 7 or 8 funiculars (first and second funicular partially fused on lateral side of one antenna for one specimen; second and third partially fused medially on both antennae of second specimen), FL:HH = 1.3–1.5; anellus stout, about twice as broad as long; F2L:F2W = 1.6–2.0, F2L:F3L = 0.6–1.3; following funiculars subequal in length, equal in width ( Fig. 33D ). Mesosoma ( Fig. 33C, F ). ML:MH = 1.5–1.7. Mesoscutal midlobe transversely costate; notauli deep. Scutoscutellar sulcus broad; frenal line present as a shallow impression; axillular sulcus distinct and foveate. Propodeal disc flat ( Fig. 33G ). Prepectus weakly rugose to smooth. Mesepisternum weakly rugose laterally, smooth ventrally, broadly rounded anterior to mid coxa. HCL:HCW = 1.6–1.9; HFL:HFW = 4.3–5.0. FWL:FWW = 2.5–2.7, FWL:ML = 2.0–2.2; basal area bare; speculum, costal cell, and wing disc densely setose. Hind wing costal cell with only 1 or 2 irregular rows of setae. Metasoma: PTL:PTW = 1.6–2.0, PTL:HCL = 0.9–1.0, lateral margin with longitudinal carina continuous with basal flange. Antecostal sulcus foveate; acrosternite posteriorly angulate.

Male. Unknown.

Hosts. Unknown.

Plant associates. Unknown.

Distribution ( Fig. 32 ). Argentina: BA; Brazil: SP; Uruguay: TA. Collected in February, November.

Material examined. Holotype. URUGUAY. Tacuaremb : 40 km NW Tacuarembo, 200-300m, 31 ° 29’45”S, 56 ° 18’8”W, 2-9.ii.1963, J.K. Bouseman [♀, deposited in AMNH: UCRCENT00238022] . Paratypes. ARGENTI-NA. Buenos Aires: San Isidro , 34 ° 28’15”S, 58 ° 31’43”W, iv.1958, J. Daguerra [1♀, USNM: UCRCENT00248388] . BRAZIL. São Paulo: Anhembi , 455m, 22 ° 42’6”S, 48 ° 10’9”W, 12.xi.2012, E.N.L. Ferreira, Malaise [1♀, DEFS: UCRCENT00439199] .

Etymology. Named in honor of James (Ding) Johnson, entomologist and Orasema collector.

Figures

FIGURE 32. Distribution map of species in the Orasema johnsoni species group.

FIGURE 33. Orasema johnsoni. Holotype female (UCRCENT00238022): A, habitus, lateral; B, head, anterior; C, mesosoma, lateral; D, antenna showing partial fusion of F2 and F3; F, mesosoma, dorsal; G, propodeum, posterior. Paratype female (UCRCENT00439199): E, ovipositor and valvifer, lateral.