Macroloxoceras

Macroloxoceras is a large pseuorthocerid from the upper Devonian of Central Colorado and Southern New Mexico with features resembling those found inactinocerids.Pseudorthocerids and actinocerids (respectively Pseuorthocerida and Actinocerida) are extinct nautiloid cephalopods, generally with long straight shells and expanded siphuncle segments filled with organic deposits.

Macroloxoceras

Macroloxoceras is a large pseuorthocerid from the upper Devonian of Central Colorado and Southern New Mexico with features resembling those found inactinocerids.Pseudorthocerids and actinocerids (respectively Pseuorthocerida and Actinocerida) are extinct nautiloid cephalopods, generally with long straight shells and expanded siphuncle segments filled with organic deposits.