Translator Disclaimer
5 April 2012 A New Hump-Backed Ginglymodian Fish (Neopterygii, Semionotiformes) from the Upper Triassic Chinle Formation of Southeastern Utah
Author Affiliations +
Abstract
A new species of hump-backed semionotiform fish, Lophionotus sanjuanensis, gen et sp. nov., is described based on specimens recently and previously collected from the Upper Triassic Church Rock Member of the Chinle Formation of southeastern Utah. It is characterized by a deep body with a large postcranial hump, and dense tuberculation on the posterodorsal margin of the skull that continues into the dorsal ridge and dorsolateral flank scales. The vertical preoperculum bears a short and broad paddle-like ventral process. The infraorbital series expands ventral to the suborbital and contacts the anterior ramus of the preoperculum, although this character has also been observed in other deep-bodied semionotiform taxa. This taxon represents the first newly described semionotiform fish species from the western United States in over 45 years, and adds to knowledge of Triassic fishes biodiversity.
© 2013 by the Society of Vertebrate Paleontology
and Sarah Z. Gibson "A New Hump-Backed Ginglymodian Fish (Neopterygii, Semionotiformes) from the Upper Triassic Chinle Formation of Southeastern Utah," Journal of Vertebrate Paleontology 33(5), (5 April 2012). https://doi.org/10.1080/02724634.2013.758125
Received: 28 November 2012; Accepted: 1 December 2012; Published: 5 April 2012
JOURNAL ARTICLE
14 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top