Rank Genus | ||
Similar Oncocerida, Nautilida, Nautiloid | ||
Trimeroceras is a genus of straight oncocerid (Nautilodea, Cephalopoda) from the Middle and Upper Silurian of Europe, and type for the Trimeroceratidae. A principal character is the slit-like aperture with a hyponomic sinus for the water-jet funnel, and mid dorsal and dorsolateral sinuses.
References
Trimeroceras Wikipedia(Text) CC BY-SA