Mecynoceras
| Mecynoceras Temporal range: Late Devonian
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Oncocerida |
| Family: | †Poterioceratidae |
| Genus: | †Mecynoceras Foerste, 1926 |
Mecynoceras is a genus of Late Devonian oncocerids included in the Poterioceratidae, a family of subcircular to compressed exogastric cyrtocones without a hyponomic sinus.
Mecynoceras has a compressed, gibbous cyrtoconic shell. The venter, especially of the chambered phragmocone is convex in profile; the body chamber long and tubular. Septa are transverse, close spaced; the siphuncle large, subcentral, with actinosiphonate deposits.
Cyrtogomphus, Lysagoroceras, and Poterioceras are among related genera.
References
- Walter C. Sweet, 1964. Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America.
- Mecynoceras Fossilworks entry.
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