Phenacoperga Cockerell, 1908

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 : 28

Genus Phenacoperga Cockerell, 1908

Fig. 26 .

Perga: Cockerell, 1907, p. 446 , original description of P. coloradensis /misidentifiation of genus.

Phenacoperga Cockerell, 1908, p. 113 –114.

Type species. Perga coloradensis Cockerell, 1907 .

Emended diagnosis. Apparently distinct from other genera of Cimbicinae by antennae short (length ca. 1.2 × head width), subclavate, flagellomere 2 only twice as long as wide; 1-M, 1m-cu strongly divergent toward anterior margin; crossvein 2r-m slightly bent.

Remarks. The forewing venation of Phenacoperga agrees with Cimbicinae as its M+Sc-R junction is well separated from that of Rs+M, and the posterior anal vein 2+3A is complete, anal cells joined by crossvein 1a. In the key to Asiatic Cimbicidae of Wei et al. (2012), which includes all genera of Cimbicinae but Labriocimbex Yan & Wei, 2019 , Phenacoperga keys to couplet 12 with Pseudoclavellaria Schulz, 1906 and Leptocimbex Semenov, 1896 but differs from both in its huge size, short and stout antennae and 1-M and 1m-cu strongly divergent toward anterior margin. Phenacoperga additionally differs from Labriocimbex and Pseudoclavellaria by its apparent absence of a rich vestiture, from Pseudoclavellaria by its ill-defined antennal club, and from Leptocimbex by its robust stature.

Figures

FIGURE 26. Phenacoperga coloradensis Cockerell holotype, UCM-4537, Cimbicinae, from the Florissant Formation: A, photograph; B, drawing; C, drawing of right forewing; D, drawing of left forewing. Scale bars A–B, 5 mm; C–D, 5 mm.