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Trimeroceratidae
Trimeroceratidae is a family of molluscs in the order Oncocerida. These molluscs were fast-moving nektobenthic carnivores. They lived in the Silurian period. Distribution Species have been found in Silurian-era strata of Canada (Québec), China, Czechia, Italy, Russia, Sweden, and the United States (Indiana, Wisconsin). Genus * '' Clathroceras'' * '' Eotrimeroceras'' * ''Inversoceras'' * '' Jeppssonoceras'' * '' Patagiumoceras'' * '' Pentameroceras'' * '' Plemeroceras'' * '' Simonssoceras'' * '' Stenogomphoceras'' * '' Trimeroceras'' See also *List of nautiloids This list of nautiloids is a comprehensive listing of all genera that have ever been included in the subclass Nautiloidea, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered in ... ReferencesPaleobiology Database Oncocerida Prehistoric cephalopod families Silurian first appearances Silurian extinctions {{silurian-animal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentameroceras
''Pentameroceras'' is a straight to slightly exogastric breviconic Oncocerida, oncocerid from the middle Silurian of North America and Europe belonging to the Trimeroceratidae. This Nautiloidea, nautiloid Cephalopoda, cephalopod produced a straight to slightly exogastric shell with a variable cross section that is generally circular, in which septa are close spaced and transverse, the body chamber is inflated. The aperture, which is constricted, consists of a narrow, vertical slit-like opening extending from the ventral hyponomic sinus to a dorsal sinus and two pairs of lateral sinuses that diverge in the upper portion. Siphuncles in the Trimeroceratidae are slender and empty. References * Sweet W.C. 1964. Nautiloidea-Oncocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America and Univ. of Kansas press. Teichert & Moore, (eds) Pentameroceras- Paleobio db {{Taxonbar, from=Q7165021 Prehistoric nautiloid genera Oncocerida ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |