Systematic Paleontology
Class: Cephalopoda
Subclass: Nautiloidea
Order: Endocerida
Family: Manchuroceratidae
The Manchuroceratidae is a family of breviconic (short) endocerids from the lower Ordovician of China and Korea. Their shells (conchs) and siphuncles have been found to be somewhat depressed (flattened). Siphuncles are ventral, as for the order.
Two genera are included, Manchuroceras and Coreanoceras.
References
Curt Teichert 1964 Endoceratoidea. Treatise on Invertebrate Paleontology, Part K.