TITLE

Chondrichthyan Origin for the Fossil Record of the Tselfatiiform Osteichthyan Fish, Thryptodus zitteli Loomis, from the Upper Cretaceous Mooreville Chalk of Alabama

AUTHOR(S)
SHIMADA, KENSHU
PUB. DATE
April 2013
SOURCE
Bulletin of the Alabama Museum of Natural History;Apr2013, Vol. 31 Issue 1, p72
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The geologically youngest record of Thryptodus Loomis, a Late Cretaceous bony fish genus (Tselfatiiformes), is from the Campanian portion of the Mooreville Chalk of Alabama. A re-examination of the sole material representing this youngest record reveals that the specimen consists of calcified cartilage prisms, indicating that it belongs to a chondrichthyan fish rather than to an osteichthyan. The re-identification made here thus concomitantly eliminates the only Campanian record for Thryptodus and emends its chronostratigraphic range to late middle Cenomanian through late Coniacian. The specimen closely resembles a skeletal part of a putative anacoracid shark (genus and species indeterminate) from the Mooreville Chalk of Alabama, suggesting that it may belong to Anacoracidae.
ACCESSION #
92630769

 

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