Ivieosema limula Burks, 2017

Burks, Roger A., Heraty, John M., Mottern, Jason, Dominguez, Chrysalyn & Heacox, Scott, 2017, Biting the bullet: revisionary notes on the Oraseminae of the Old World (Hymenoptera, Chalcidoidea, Eucharitidae), Journal of Hymenoptera Research 55, pp. 139-188 : 165-169

Ivieosema limula Burks sp. n. Figs 49-54 , 55

Etymology.

Latin noun meaning "small file ( carpenter’s or sculptor’s tool)," referring to the finely striate mesosomal surface sculpture.

Diagnosis.

Recognized from other Orasema and African Ivieosema by the fore wing lacking setae and presence of a medial longitudinal fold. Distinguished from I. confluens by the reticulate facial sculpture, frons with a single depression between eye and antennal scrobe (Fig. 50 ), and the basal gastral tergite with a laterally smooth median longitudinal depression extending the entire length of the tergite.

Female.

Length 3.1 mm. Head and mesosoma almost entirely dark brown, without metallic luster; pronotum ventrally, prepectus, and acropleuron yellowish-brown. Scape white; pedicel and flagellum pale brown. Coxae and most of femora pale brown; trochanters, femoral apices, tibiae, and tarsi white. Fore wing venation glossy and milky brown. Gaster brown to dark brown.

Head (Figs 50-51 ) 1.4 × as broad as long. Face flat and smooth; medial scrobal depression absent, but frons with paired dorsal frontal depressions lateral to scrobal area (Fig. 50 , dfd); lower frons with a distinct vertical groove (Fig. 50 , lg); scrobal area with a single medial large pit just below median ocellus; supraclypeal area smooth, clypeus shallowly irregularly sculptured, anterior tentorial pits very deep and broad, anteclypeus very short; scrobal depression broadly and shallowly impressed; vertex not carinate. Labrum with 4 digits. Maxillary and labial palps absent. Flagellum 1.2 × head height, 7 funiculars; anellus slightly broader than long, expanding apically (Fig. 51 , F1 ); F2 2.0 × as long as broad, F2 1.1 × as long as F3.

Mesosoma (Figs 52-53 , 55 ). Mesoscutum finely reticulate, with a shallow median depression; notauli finely reticulate in their troughs, with vague margins and not foveate, merging posteriorly as a transverse depression anterior to the transscutal articulation, which is present medially (Fig. 53 , tsa). Axilla anteriorly reticulate, posteriorly longitudinally striate; mesoscutellum and axillula finely longitudinally striate; frenal line as a pale strip slightly elevated above frenum. Metascutellum narrow and protruding, not separated from rest of metanotum but with fine reticulate sculpture anteromedially. Mesepisternum finely reticulate dorsally and anteriorly, smooth posteroventrally, forming a short protruding horizontal surface anterior to mesocoxa. Propodeum finely reticulate, with a shallow and vague median carina; callus bare, glossy and more shallowly reticulate than propodeal disc. Metacoxa smooth. Fore wing (Fig. 55 ) 2.2 × as long as broad; venation with only a few tiny setae, including on submarginal vein; costal cell bare; basal cell bare; speculum present, with two oblique folds that converge anteriorly towards stigma and diverge posteriorly; marginal vein very thick basally and narrowing apically, separating from wing margin to smoothly form the stigmal vein; stigmal vein 1.4 × as long as broad; postmarginal vein absent; cubital and subcubital folds with only a few tiny setae beyond speculum; marginal fringe absent. Hind wing costal cell bare.

Metasoma (Fig. 54 ). Petiole 1.7 × as long as broad, 0.9 × as long as metacoxa, nearly smooth medially but longitudinally rugose-reticulate laterally, without transverse anterior carina and narrowest anteriorly immediately posterior to the condyle. Gt1 with a deep longitudinal median depression extending length of tergite and with smooth lateral margins. Antecostal sulcus of Gs1 smooth; acrosternite smooth to very shallowly reticulate. Cercus with all setae subequal in length. Hypopygium with a few setae submedially. Ovipositor dorsal valve with 8 medially interrupted annuli, including a basal annulus that is broadly separated from the rest; ventral valve with 4 lateral teeth and with a vague transverse elevation immediately basal to toothed apex.

Male.

Unknown.

Material examined.

Holotype: Madagascar: Toliara Prov: Manderano , 70m, 23°31'39"S, 44°05'18"E, 23.vi-28.vii.2002, Frontier Wilderness Project, gallery forest at the edge of marsh, 5m from road, Malaise trap [1♀, CAS: CASENT2022276], deposited in CAS.

Figures

Figure 55. Ivieosema limula. Holotype female: fore wing.

Figures 49 - 54. Ivieosema limula. Holotype female: 49 habitus, lateral 50 head, anterior 51 antenna, lateral 52 mesosoma, lateral 53 mesosoma, dorsal 54 ovipositor, lateral. dfd = dorsal frontal depression; F 1 / an = anellus; lg = longitudinal groove; mts = metascutellum; tsa = transscutal articulation.

Figures 1 - 6. Australosema politurae. Paratype female: 1 habitus, lateral 2 head, anterior 3 antennae, ventral 4 mesosoma, dorsal 5 propodeum and petiole, oblique dorsal. Paratype male: 6 antennae, lateral. acl = anteclypeus; acr = acrosternite; acs = antecostal sulcus; apc = anterior petiolar carina; ax = axilla; cal = callus; cly = clypeus; F = flagellomere; fr = frons; Fu = funicular; F 1 / an = anellus; llm = mesoscutal lateral lobe; lpr = lateral propodeal disc; mlm = mesoscutal midlobe; mpr = median propodeal disc; pet = petiole; not = notauli; scd = scutellar disc.