''Cotteroceras'' is a genus of proterocameroceratids from the

Lower Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. The ...

of North America and Siberia characterized by a long straight and compressed shell with very short

camera A camera is an Optics, optical instrument that can capture an image. Most cameras can capture 2D images, with some more advanced models being able to capture 3D images. At a basic level, most cameras consist of sealed boxes (the camera body), ...

e and long body chamber. Sutures are straight and oblique, sloping

dorsoventrally Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position prov ...

toward the apex. The

siphuncle The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and ...

is large but details are unknown.

References

* Teichert, C, 1964. Proterocameroceratidae, pp 166– 170 in the

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

Part K. Geol Soc of America and Univ of Kansas Press. {{Taxonbar, from=Q5175598 Prehistoric nautiloid genera Ordovician cephalopods Ordovician cephalopods of North America Fossil taxa described in 1936