Hemerobiidae, Leach, 1815

Makarkin, Vladimir N., 2023, Fossil Hemerobiidae (Neuroptera) from the Eocene Tadushi Formation, the Russian Far East, with description of a new genus, Zootaxa 5297 (1), pp. 115-123 : 120-121

Hemerobiidae gen. et sp. B

Fig. 5

Material examined. PIN 3364/3749 (part); a basal fragment of a forewing.

Locality and horizon. Sadovaya [=Yushangou] River, a right tributary of Zerkal’naya [=Tadushi] River, eastern Sikhote-Alin Mountains of Primorskii Krai, Russian Far East. Tadushi Formation, early/middle Eocene.

Description. Forewing 2.5 mm as preserved (estimated complete length ca. 7 mm), ca. 2.4 mm wide as preserved (estimated complete width ca. 3.5 mm). Costal space proximally broad. Humeral subcostal veinlet well developed, with seven branches (distal-most once forked, other simple). Two proximal-most subcostal veinlets once forked; third subcostal veinlet twice forked; other three only proximally preserved. Basal subcostal crossvein (1sc-r) located at level of origin of RP1. RP1 deeply forked. Preserved basal part of M not forked (likely forked much distad origin of RP1). Cu dividing into CuA and CuP basally. A1 forked far distad division of Cu. Crossvein between CuP and A1 short (highly likely belonging to second gradate series).

Remarks. The venation of this forewing fragment is generally typical for many genera of Hemerobiidae . However, the deeply forked A1 occurs in most genera of the Megalomus -group, and rarely in other genera.

Figures

FIGURE 5. Hemerobiidae gen. et sp. B, specimen PIN 3364/3749.A, specimen as preserved (wetted with ethanol); B, forewing venation. Scale bars = 0.5 mm.