Kingdom Animalia Class Cephalopoda Order Nautilida Rank Genus | Phylum Mollusca Subclass Nautiloidea Superfamily Trigonocerataceae | |
Maccoyoceras is a genus of nautilids included in the family Trigonoceratidae from the Mississippian of North America (Michigan) and Europe.
The shell of Maccoyocerasis evolute, volutions only slightly impressed, whorl section hexagonal. Venter flattened, flanks converging, umbilical shoulder prominent. Siphuncle slender, ventral of whorl center.
References
Maccoyoceras Wikipedia(Text) CC BY-SA