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Uyrekura chalkarica
Taxonomy
Uyrekura chalkarica was named by Zelenkov (2024). Its type specimen is PIN 2974/4, a limb element, and it is a 3D body fossil. Its type locality is Chelkar-Tengiz, which is in a Rupelian lacustrine - large horizon in the Chelkarnura Formation of Kazakhstan. It is the type species of Uyrekura.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Uyrekura chalkarica Zelenkov p. 8 figs. Fig. 3A, B, D |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Uyrekura chalkarica Zelenkov 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. Zelenkov 2024 | Uyrekura chalkarica differs from species of Romainvillidae in: absence of well-developed fovea carpalis cranialis, presence of deep and extended depressio muscularis interna, and caudally protruding subcircular ventral rim of trochlea carpalis. Uyrekura chalkarica is distinguished from Anseranas semipalmata in smaller size, reduced (poorly caudally protruding) dorsal rim of trochlea carpalis in dorsal view. It is distinguished from species of Pinpanetta Worthy, 2009 by absence of notch in dorsal rim of trochlea carpalis and absence of pronounced ligamentary depression on dorsocaudal part of dorsal
trochlea carpalis (which forms notch in caudal view). Uyrekura chalkarica is distinguished from species of Mionetta Livezey and Martin, 1988 by: proximally inclined processus extensorius, much deeper depressio muscularis interna, absence of fovea carpalis cranialis, strongly caudally protruding ventral rim of trochlea carpalis, notably deeper fossa infratrochlearis bounded by distinct ridge, absence of distinct deep pit on ventral surface just distocaudal to processus pisiformis, lack of depression on dorsocaudal surface of proximal end and notch in caudal margin of dorsal rim of trochlea carpalis, as well as longer and narrower fovea carpalis caudalis. From evolutionarily more advanced fossil anatid taxa (including species of Manuherikia Worthy, Tennyson, Jones, McNamara, & Douglas, 2007) and all modern species of Anatidae, U. chalkarica differs in lack of depression on dorsocaudal surface of proximal end and lack of notch in caudal margin of dorsal rim of trochlea carpalis. U. chalkarica is further distinguished from all anatid taxa except species of Manuherikia, extant Biziura lobata and Merganetta armata in strongly protruding caudally ventral rim of trochlea carpalis. Uyrekura chalkarica also differs from species of Manuherikia in absence of distinct fovea carpalis cranialis and ventral rim of trochlea carpalis oriented strictly parallel to longitudinal axis of the bone in caudal view (angled in Manuherikia). Uyrekura chalkarica can also be distinguished from B. lobata by inclined proximal wall of processus extensorius (perpendicular to long axis of the bone in B. lobata) and poorly proximally-protruding dorsal rim of trochlea carpalis relative to processus extensorius in dorsal view (dorsal rim extends further proximal and is pointed proximally in Biziura). |