Orasema pisi Burks, Heraty & Dominguez, 2018

Burks, Roger A., Heraty, John M., Dominguez, Chrysalyn & Mottern, Jason L., 2018, Complex diversity in a mainly tropical group of ant parasitoids: Revision of the Orasema stramineipes species group (Hymenoptera: Chalcidoidea: Eucharitidae), Zootaxa 4401 (1), pp. 1-107 : 75-77

Orasema pisi Burks, Heraty & Dominguez n. sp.

urn:lsid:zoobank.org:act:5FC51DCF-F588-4E61-9BEF-BACBF53BB44B ( Figs 163–170 )

Diagnosis. Mesoscutum, mesoscutellum, and petiole finely reticulate. F2 shorter than F3.

Orasema pisi is the only small-bodied species in this group with simple reticulate mesoscutal and petiolar sculpture. It differs from other reticulate species in its very short F2 ( Fig. 165 ).

Description. Female. Length 2.2 mm.

Color: Head and mesosoma dark green with reddish to yellowish luster. Pedicel brown; anellus brown; flagellum brown. Coxae dark green to brown; fore femur mostly brown, yellow in apical third; mid femur mostly brown, tips pale; hind femur mostly yellow, with large yellowish-brown area subbasally. Fore wing hyaline; venation yellowish. Petiole dark green; gaster brown with purple luster.

Head: Head width:head height 1.3; face reticulate; longitudinal groove between eye and torulus indicated by a small area of coarse sculpture; eyes bare, inter-ocular distance:eye height 1.4; malar space:eye height 0.5; supraclypeal area slightly broader than long, mostly weakly sculptured, with smooth area ventromedially; clypeus weakly sculptured; Flagellum length:head height 1.0; F2 1.3× as long as broad, 0.7× as long as F3; following funiculars progressively shorter and broader.

Mesosoma: Mesosoma length:height 1.3. Mesoscutal midlobe reticulate, with minute setae; lateral lobe reticulate. Axilla reticulate; mesoscutellar disc reticulate; frenal line reticulate; frenum reticulate; axillular groove anteriorly narrow, broad and foveate posteriorly; axillula reticulate with a few longitudinal carinae ventrally. Propodeum without median carina; propodeal disc medially areolate-reticulate; callus reticulate, with a few small setae. Mesepisternum reticulate laterally and ventrally, broadly rounded anterior to mid coxa. Upper mesepimeron reticulate dorsally, smooth ventrally; lower mesepimeron reticulate; transepimeral sulcus distinct. Metepisternum laterally reticulate. Hind coxa 2.0× as long as broad; hind femur 5.2× as long as broad. Fore wing 2.4× as long as broad, 2.4× as long as mesothorax; stigma with 4 sensilla separated into pairs. Hind wing costal cell with a broad bare area.

Metasoma: Petiole 1.6× as long as broad, 0.7× as long as hind coxa, reticulate to areolate-reticulate, anterior carina weak. Antecostal sulcus crossed by minute carinae; acrosternite posteriorly angulate.

Male. Unknown.

Distribution. Argentina (Salta).

Material examined. Holotype: ARGENTINA: Salta: Cabeza de Buey, RN 34, 781m, 24°47'38"S, 65°01'56"W, 15.iii.2007, J.&J. Heraty & J. Torréns, chaco [ UCRCENT 00161485, D2490], deposited in IMLA.

Etymology. The Quechua word for “small,” referring to the body size.

Figures

FIGURES 163–168. Orasema pisi. Holotype ♀: 163. Habitus. 164. Head. 165. Antenna, with F2 plus pedicel, and F6–F7 inset.166.Mesosoma, dorsal view. 167. Axillula. 168.Stigma and postmarginal vein.

FIGURES 169–170. Orasema pisi. Holotype ♀: 169. Propodeum.170 Petiole, hind coxa.