Eopachylosticta byrami ( Cockerell, 1925 )

Archibald, S. Bruce & Rasnitsyn, Alexandr P., 2023, Cimbicidae (Hymenoptera, ‘ Symphyta’) in the Paleogene: revision, the new subfamily Cenocimbicinae, and new taxa from the Eocene Okanagan Highlands, Zootaxa 5278 (1), pp. 1-38 : 25-26

Eopachylosticta byrami ( Cockerell, 1925)

Fig. 23 .

Amasis byrami Cockerell, 1925, p. 10 , plate 1, Fig. 4

Eopachylosticta byrami Malaise, 1945, p. 14 .

Holotype. USNM 69181 . A complete female with its body mostly well preserved, but almost no legs evident and poorly preserved wings with venation too faint to interpret. Green River Formation, about 8 miles south of De Beque , Colorado ( Cockerell 1925), Ypresian.

Diagnosis. As for genus.

Description. Body length ca. 8.2 mm; head, antennae dark; thorax dark, hind femora somewhat infuscate (otherwise legs not visibly preserved, presumably pale), anterior abdomen light, posterior segments lightly infuscate. Head transverse, temples short; compound eyes not preserved; antenna five-segmented, with pedicel transverse, distinctly wider than flagellar base, flagellomere 1 thin, slightly widened apically, twice as long as wide, trapezoid, flagellomere 2 wider, together about as long as thick, unsegmented club. Pronotum not distinct, mesonotum only partially visible, with median longitudinal mesonotal sulcus and notauli well developed, meeting well before presumed position of scutellum (poorly preserved); mesopleuron with percurrent mesopleural groove; otherwise, thoracic structure obscure. Hind femora short. Forewing almost entirely invisible as preserved. Abdomen short, wide; ovipositor short, not exceeding abdominal apex, sheaths not distinct.

Material. Holotype.

Locality and age. Green River Formation, about eight miles south of De Beque , Colorado ( Cockerell 1925), Ypresian .

Figures

FIGURE 4. Allenbycimbex morrisae, holotype RBCM.EH2007.002.0001: A, photograph; B, drawing; C, drawing of right wing; D, drawing of left wing. Scale bar for A and B is 5 mm (as the fossil has been stretched by geologic shear forces, C and D are altered to the presumed unstretched configuration).

FIGURE 23. Eopachylosticta byrami (Cockerell) holotype, USNM-69181, Pachylostictinae, from the Green River Formation: A, photograph; B, drawing. Scale bar 5 mm.