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ID for a strange chondrichthyan denticle?


Carson

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I believe this is a partial denticle. Does anyone know what shark or ray it would have belonged to? It was found in a Late Maastrichtian clay in Arkansas. 

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Same age as the Hell  Creek  this one is the one of the most common in that fauna  Myledaphus sp. denticle may be the same.

 

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My first guess would be some type of dermal denticle, but I've never seen one like this. Second guess would be from a bony fish. They sometimes have ornamentation on their scales and bones of the skull. What does the bottom look like?

 

Myledaphus is a fresh water ray and hasn't been found in the Southern states but there are related rays that are found there.

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29 minutes ago, Al Dente said:

My first guess would be some type of dermal denticle, but I've never seen one like this. Second guess would be from a bony fish. They sometimes have ornamentation on their scales and bones of the skull. What does the bottom look like?

 

Myledaphus is a fresh water ray and hasn't been found in the Southern states but there are related rays that are found there.

 

Here is the the under side. 

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Check out these pubs if you don't already have them.


J. Paleont., 80(4), 2006, pp. 700–716
Copyright q 2006, The Paleontological Society
0022-3360/06/0080-700$03.00
CHONDRICHTHYANS FROM THE ARKADELPHIA FORMATION
(UPPER CRETACEOUS: UPPER MAASTRICHTIAN)
OF HOT SPRING COUNTY, ARKANSAS
MARTIN A. BECKER,1 JOHN A. CHAMBERLAIN JR.,2 AND GEORGE E. WOLF3

 

Journal of Vertebrate Paleontology 30(4):1019–1036, July 2010
©2010 by the Society of Vertebrate Paleontology
ARTICLE
OSTEICHTHYANS FROM AN ARKADELPHIA FORMATION–MIDWAY GROUP LAG DEPOSIT

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No other freshwater fish material has been found. I am collecting a similar fauna as Case and Cappetta (1997) in Texas. 

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