Trilobita - Asaphida - Asaphidae
Alternative combinations: Kirkella declivita, Ptyocephalus declevita, Ptyocephalus declevitus, Ptyocephalus declivita, Ptyocephalus declivitus
Full reference: R. J., J.r. Ross. 1951. Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Yale Peabody Museum of Natural History Bulletin 6:1-161
Belongs to Ptyocephalus according to R. A. Fortey 1975
See also Dean 1989, Hintze 1953, Ross 1951 and Ross 1968
Sister taxa: Ptyocephalus acclivus, Ptyocephalus vigilans, Kirkella yersini, Kirkella fillmorensis
Type specimen: YPM 18138, a pygidium. Its type locality is Locality 13, Round Hill, Zone "J", which is in a Blackhillsian shallow subtidal limestone/chert in the Garden City Formation of Utah.
Distribution:
• Ordovician of Canada (3: Alberta, British Columbia collections), United States (10: California, Utah)
• Tremadoc of Canada (13: Alberta)
Total: 26 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.