Maccoyoceras is a genus of nautilids included in the family Trigonoceratidae from the Mississippian of North America (Michigan) and Europe.
| Maccoyoceras Temporal range: Mississippian
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | †Trigonoceratidae |
| Genus: | †Maccoyoceras Miller, Dunbar, & Condra, 1933 |
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 edit
- Barnhard Kummel, 1964. Nautiloidea - Nautilida; Treatise on Invertebrate Paleongology, Part K. Geological Society of America and University of Kansas Press.
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