New Data on Hesperornitids (Aves: Ornithurae) from the Lower Volga Region (1 Viewer)

[Fred Ruhe]

N. V. Zelenkov and M. S. Arkhangelsky, 2023
New Data on Hesperornitids (Aves: Ornithurae) from the Campanian of the Lower Volga Region (Late Cretaceous, Russia)

Doklady Biological Sciences 509: 11-14

Abstract; free pdf: https://www.researchgate.net/public...the_Lower_Volga_Region_Late_Cretaceous_Russia

Taxonomic diversity of Late Cretaceous hesperornithids (Aves: Hesperornithidae) of European Russia and Eastern Europe as a whole remain poorly understood, and the morphology of these large flightless birds is poorly known. New finds of Hesperornithidae in the Karyakino locality (Saratov oblast, Russia) confirm the coexistence of two forms of these flightless seabirds in the Campanian (mid-Late Cretaceous) of the Lower Volga region. A femur is described for the first time for Hesperornis rossicus Nessov et Yarkov, 1993, indicating that this large species is morphologically distinct from North American H. regalis Marsh, 1872.

Enjoy,

Fred

 

[Fred Ruhe]

Fig. 1. New finds of Hesperornis (Aves: Hesperornithidae) from the Campanian of the Karyakino locality (Lower Volga region, Saratov oblast, Late Cretaceous). (a–c) Hesperornis rossicus Nessov et Yarkov, 1993, a fragmentary right femur, PIN item no. 5027/8: (a) caudal, (b) cranial, and (c) distal views. (d–f) Hesperornis sp., a fragmentary right tibiotarsus, PIN item no. 5027/9: (d) cranial, (e) caudal, and (f) distal views. Designations: ai, apophysis internum ligament obliqui; cm, condylus medialis; cl, condylus lateralis; ctl, crista trochlearis lateralis; fp, fossa poplitea; ii, incisura intercondylaris; si, sulcus intercondylaris; sp, sulcus patellaris; tf, trochlea fibularis.