Palegonympha triassica Sinitshenkova & Aristov

Sinitshenkova, Nina D., Aristov, Daniil S., Wegierek, Piotr & Żyła, Dagmara, 2015, New mayfly genera from the Middle Triassic of Poland and their evolutionary and paleogeographic implications (Ephemerida: Litophlebiidae, Vogesonymphidae), Zootaxa 3949 (2), pp. 281-288 : 284-285

Palegonympha triassica Sinitshenkova & Aristov , sp. nov.

Figure 2

Type. Holotype no. ZPAL V.44.I/309, Institute of Paleobiology, Polish Academy of Sciences, positive imprint of nymphal exuviae.

Type locality and horizon. Pałęgi, Holy Cross Mountains ( Poland), Olenekian-Anisian, Middle Triassic.

Diagnosis. Same as for the genus.

Description. Length of nymph fragment without last abdominal segments: 9.50; total length: about 11. Wing pads slightly darkened. Head rounded. Pronotum distinctly wider than head; pronotum two times as wide as long.

Wing pads oval-shaped, three times as long as wide. Abdominal segments short and wide; including lateral protrusions, almost six times as wide as long. Gills not visible.

Remarks. The mesonotum is clearly separated at the ecdysial line, indicating that this specimen is a set of nymphal exuviae. Please make special note that the right wing pad is drawn as narrow, but in fact it is much wider. As this pad is situated at an angle to the thorax, we can see only its projection.

Etymology. The species name derives from the Triassic period.

Figures

FIGURE 2. Palegonympha triassica, gen. et sp. nov., holotype, ZPAL V. 44. I / 309. A. Imprint of nymphal exuviae. B. Holotype, line drawing.