Endoceratidae

Classification
Phylum: Mollusca
Class: Cephalopoda
Order: Endocerida
Family: Endoceratidae (Hyatt, 1883)
Cincinnatian Genera: Cameroceras, Endoceras

Geologic Range
Early Ordovician – Late Ordovician, ?Middle Silurian

Common Paleoecology
Endoceratidae is an extinct family of nektobenthic carnivores

Description of the Family

  • Large to extremely large conchs, straight and generally robust
  • Siphuncle large, mostly ventral, but may be subventral to central
  • Septal necks holochoanitic to macrochoanitic
  • Connecting rings generally thin, forming lining on internal surface of septal necks
  • Apical end of siphuncle inflated to fill entire apical portion of conch

Published Descriptions

Treatise on Invertebrate Paleontology, Part K (1964):

  • Straight, generally robust, large to extremely large conchs, including the largest known Paleozoic invertebrate fossils. Siphuncle large, mostly ventral, but may be subventral to central in position. Septal necks holochoanitic to macrochoanitic; connecting rings generally thin, forming lining on internal surface of septal necks; endospiphuncular structures generally simple. In many forms apical end of siphuncle inflated to fill entire apical portion of conch.

Cameroceras


Endoceras