Late Pennsylvanian fish assemblage from the Robledo Mountains and new records of Paleozoic chondrichthyans in New Mexico, USA

 

Authors: Ivanov AO, Lucas SG

Published in: Bulletin of Geosciences, volume 94, issue 2; pages: 235 - 255; Received 1 January 2019; Accepted in revised form 4 April 2019; Online 10 May 2019

Keywords: fishes, Late Devonian-early Permian, New Mexico,

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Abstract

We describe a very diverse and rich assemblage of fossil fishes from the Upper Pennsylvanian (Missourian) interval of the Horquilla Formation in the Robledo Mountains of southern New Mexico, USA. The assemblage includes bransonelliforms, symmoriiforms, a ctenacanthiform, a jalodontid, euselachians, neoselachians, an orodontiform, a helodontiform, an eugeneodontiform, a petalodontiform, a psephodontid, an acanthodian and actinopterygians. For the first time, the vascularization system of the teeth of Adamantina, Bransonella, Helodus and Agassizodus has been studied using a micro-CT. Besides the diverse fish assemblage from the Robledo Mountains, some other new records of Paleozoic chondrichthyans in New Mexico are documented.