| 词条 | Mecynoceras |
| 释义 |
| fossil_range = Late Devonian | image = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = | ordo = Oncocerida | familia = Poterioceratidae | genus = Mecynoceras | genus_authority = 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
1 : Prehistoric nautiloid genera |
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