Catalog Number: CG-0025

I am currently updating this post. I received a more solid identification of Brachycycloceras after a visit to the Carnegie Museum.

First described by Miller in 1933, the genus Brachycycloceras occurs from 326 million years ago up until the Permian extinction, 252 million years ago. This genus is relativity unknown to me. There are 5 valid species under the genus. They are:

GenusSpeciesYearDescriber
Brachycyclocerascurtum1869Meek and Worthen
Brachycyclocerascyclophorum1879Waagen
Brachycyclocerasnormale1855Miller et al.
Brachycyclocerasrustaqense1996Niko et al.
Brachycycloceraswashingtonense1964Gordon, Jr.
The 5 valid species of the genus Brachycycloceras.

Its worth noting that the Encyclopedia of Ancient Life lists Brachycycloceras bransoni as a species.

This is by far the largest identifiable Cephalopod body chamber I have found to date. It came out of the hillside as a boulder but had a familiar body chamber shape. I could quickly identify it as a cephalopod, but I was unsure of the species. This particular specimen measures 5.5 inches wide by 9 inches long.

As usual, a specimen this large is also very fragmented and hard to see detail past what you can see in photos below. However it is positive for being a shelled creature of this size.

More on Brachycycloceras

More large Cephalopod posts