Roz Posted July 1, 2008 Share Posted July 1, 2008 I found this over a year ago when I lived in Arkansas. It was in a Cretaceous creek. Someone said it might be a Dakoticancer crab at the time but wasn't sure. Is that what it is? It seems small compared to the ones I have seen online.. Thanks! Welcome to the forum! Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted July 1, 2008 Share Posted July 1, 2008 Roz Can you post a head-on view of its face showing the rostrum and orbits if present? With enough views I can compare to some of the specimens I've collected. I'm told that the ventral side is diagnostic, and yours seems to be largely eroded away, but I'd be glad to take a look. Does the specimen look like a phosphatic internal mold to you? From here it appears to lack the actual shell which would have many fine tubercles as seen in specimens from the Corsicana formation. Other than D. australis as I've found in South Texas, I've read about a D. overana in the Pierre Shale which is smaller and preserved more like what you've found. D. australis is a Maastrichtian form - do you know the formation and age where you found yours? D. australis in my experience has a pretty big carapace for a Cretaceous TX crab, ranging from 1 inch juvies to 2.5 inch whopping adults not including legs and claws when present. They seem to average around 1.75-2 inches in my experience. No matter how it shakes out, that is a very cool find. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Roz Posted July 1, 2008 Author Share Posted July 1, 2008 Dan I hope I am posting the rostrum and orbit. I think the orbit has eroded away though. The top may be not the actual shell, and an internal mold (not sure), but the legs have tubercles that I can see with my loop. The formation would be Ozan but not certain of the exact age. Hope you can tell from the pics.... Welcome to the forum! Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted July 1, 2008 Share Posted July 1, 2008 Sorry Roz, I can't really tell for sure what genus or species we are looking at although it is similar in form to Dakoticancer. Looks like your rostrum is gone as are the bottom half of the orbits and the maxillipeds (feeding appendages). Seeing both crabs first hand side by side would be helpful, but honestly my knowledge of Ozan age crustaceans is lacking as I've not had the opportunity to collect them. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
MB Posted July 1, 2008 Share Posted July 1, 2008 I found this over a year ago when I lived in Arkansas. It was ina Cretaceous creek. Someone said it might be a Dakoticancer crab at the time but wasn't sure. Is that what it is? It seems small compared to the ones I have seen online.. Thanks! Roz, ISN'T Dakoticancer http://www.mbfossilcrabs.com/ Link to comment Share on other sites More sharing options...
MB Posted July 2, 2008 Share Posted July 2, 2008 Hey Roz, you can say it, this one is Costacopluma crab, Costacopluma bishopi, Vega&Feldmann, the oldest member of this Retoplumid crab. I want one 1 http://www.mbfossilcrabs.com/ Link to comment Share on other sites More sharing options...
Roz Posted July 2, 2008 Author Share Posted July 2, 2008 Thanks, MB I have a label on it now. Welcome to the forum! Link to comment Share on other sites More sharing options...
worthy 55 Posted July 11, 2008 Share Posted July 11, 2008 Cool one Roz !!!! It's my bone!!! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now