''Maccoyoceras'' is a genus of
nautilids included in the family
Trigonoceratidae
The Trigonoceratidae is a family of coiled nautiloid cephalopods that lived during the period from the Early Carboniferous ( Mississippian) to the Early Permian.
Diagnosis
Trigonoceratidae comprise members of the order Nautilida characterized ...
from the Mississippian of North America (Michigan) and Europe.
The shell of ''Maccoyoceras''is evolute, volutions only slightly impressed, whorl section hexagonal. Venter flattened, flanks converging, umbilical shoulder prominent. Siphuncle slender, ventral of whorl center.
References
* Barnhard Kummel, 1964. Nautiloidea - Nautilida; Treatise on Invertebrate Paleongology, Part K. Geological Society of America and University of Kansas Press.
Prehistoric nautiloid genera
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