Orasema erwini, Burks, Roger A., Mottern, Jason & Heraty, John M., 2015

Burks, Roger A., Mottern, Jason & Heraty, John M., 2015, Revision of the Orasema festiva species group (Hymenoptera: Chalcidoidea: Eucharitidae), Zootaxa 3972 (4), pp. 521-534 : 529-530

Orasema erwini n. sp.

urn:lsid:zoobank.org:act:F2C98814-442B-417C-A13B-43BB19174B15 ( Figs 18–21 )

Diagnosis. Face with longitudinal groove between torulus and eye. Petiole slightly expanded laterally near midlength, but at least 3.6× as long as broad, and with dorsal sculpture including irregular longitudinal carinae ( Fig. 21 ).

Similar to O. delicatula and O. festiva , but recognized by the dorsal petiolar sculpture and intermediate lateral expansion of the petiole.

Female. Length, 3.5 mm. Head and mesosoma metallic bluish green to black; pedicel and anellus yellowish brown, flagellum dark brown; coxae yellow, metatrochanters with small brown area medially; petiole metallic blue to purple; gaster dark brown dorsally, ventrally pale brown, except anterior region of Ms2 black with metallic luster.

Head subquadrate, 1.5× as long as broad ( Fig. 18 ). Face with broad depression enclosing a longitudinal groove between torulus and eye; scrobal depression medially with a broad flat carina bordered laterally by narrow foveate furrow. Eye bare. Labrum with 8 digits. Palpal formula 3-2. Pedicel as broad as F2; flagellum 2.1× height of head, F2 2.5× as long as broad, F2 1.3× as long as F3.

Mesosoma ( Figs 19, 20 ) with mid lobe coarsely areolate-rugose, bare; lateral lobe nearly smooth posteriorly, with finely sculptured area near center. Axilla with oblique carinae; mesoscutellar disc coarsely areolate-rugose, as long as broad, broadly separated from transscutal articulation at base by deep fovea; frenum coarsely areolaterugose. Propodeal disc areolate-rugose with irregular median carina; callus smooth, with a few setae. Metafemur with short dense setae dorsoapically. Fore wing 2.8× as long as broad; stigmal vein 2.0–2.5× as long as broad, perpendicular to anterior margin.

Metasoma with petiole 1.7× as long as metacoxa, 3.6× as long as broad, laterally weakly expanded near midlength, weakly rugose with irregular median dorsal carina that is weak or absent posteriorly ( Fig. 21 ). Hypopygium with few minute setae apically. Ovipositor curved cephalad, ventral (first) valvula with subapical lateral line of 6 blunt teeth; dorsal (2nd) valvula with 10 rasp-like annuli meeting along midline.

Male. Length, 3.25–3.58 mm. Similar to female except for following character states: antenna with flagellum 2.5–2.9× height of head; F2 length/width = 2.5–3.4; metasoma with petiole 1.7–2.3× as long as metacoxa, 3.5–4.7× as long as broad. Genitalia: parameres long and narrow, digitus with 5 broadly spaced teeth.

Type material. Holotype. Brazil: Mato Grosso: Sinop, 11°52'14"S, 55°29'46"W, x.1974, M. Alvarenga, Malaise [1♀, CNC: UCRCENT00320683]. Paratypes. Ecuador: Napo: Reserva Etnica Waorani 1 km S. Onkone Gare Camp, 220m, 0°39'10"S, 76°26'00"W, 2.x.1999, T.L. Erwin et al. [4♂ 1♀, UCRC: UCRCENT00092062, USNM: UCRCENT00092063, USNM: UCRCENT00092209, USNM: UCRCENT00092061, USNM: UCRCENT00092064]. Peru: Madre de Dios: 30 km (air) SW Ptp. Maldonado, 290m, 12°50'00"S, 69°17'00"W, 9.iii.1984, T.L. Erwin [2♂, UCRC: UCRCENT00436386, UCRC: UCRCENT00436387].

Etymology. Named in honor of Terry L. Erwin of the Smithsonian Institution, a champion of tropical biodiversity who has opened our eyes to what might be possible.

Figures

FIGURES 18 – 21. Orasema erwini. 18 and 19, paratype female (UCRCENT 00092209): 18, head, anterior; 19, mesosoma, lateral. 20 and 21, holotype female (UCRCENT 00320683): 20, mesosoma, dorsal; 21, petiole, dorsal.