Eupsenella sp.

BRAZIDEC, MANUEL & PERRICHOT, VINCENT, 2022, A fossil flat wasp (Hymenoptera: Bethylidae) from the early Eocene Green River Formation suggests past cosmopolitan distribution of the genus Eupsenella Westwood, 1874, Palaeoentomology 5 (4), pp. 378-384 : 379

Eupsenella sp.

( Figs 1 , 2 )

Material. Specimen UCM 58339 of unknown sex, part. Right lateral aspect of the body, with legs, left hind wing and parts of the antennae missing.

Locality and horizon. Denson Site, Green River, Colorado, USA; Lake Uinta, Piceance Basin, Parachute Creek member; upper Ypresian, Eocene, ca. 48 Ma.

Description. Body dark brown, not especially flattened, stout (length 3.23 mm). Head ovoid, apparently longer than wide; LH: ca. 0.67 mm; WH: ca. 0.36 mm; HE: 0.21 mm; compound eyes elliptical, longer than high; antennae short, only scape and two apicalmost flagellomeres preserved, apical flagellomere tapering at apex; vertex corners rounded. Mesosoma shorter than metasoma (length 1.04 mm). Fore wing micropubescent, without apparent colour patterns (LFW: 1.91 mm); C, Sc+R, M+Cu, 1Rs&1M, Rs+M, Rs and R1 preserved and tubular; 1Rs&1M angulate at junction with Rs+M; Rs apically angulate toward wing margin; poststigmal abscissa of R1 apically arched; [C], [R], [1M] (areolet), [1R1] and [2R1] cells closed; [1M] cell small, subpentagonal, aligned basally with [1R1] cell; [1R1] cell elongate, 1.0 × [2R1] cell; [2R1] cell 0.19 × LFW, evenly wide, as wide as [1R1] cell; pterostigma well-defined, elongate, slightly shorter than [1R1] cell, rectangular. Hind wing hyaline, without apparent venation. Metasoma fusiform (length 1.52 mm); segments not discernible.

Figures

FIGURE 1. Photograph of Eupsenella sp., specimen UCM 58339 (scale bar = 1 mm).

FIGURE 2. Line drawing of Eupsenella sp., specimen UCM 58339 (dashed lines indicate interpretations; scale bar = 1 mm).