Phylum: Mollusca
Class: Cephalopoda
Order: Endocerida (Teichert, 1933)
Cincinnatian Families: Endocertidae

Geologic Range
Early Ordovician – Late Ordovician, ?Middle Silurian

Common Paleoecology
Endocerida is an extinct order of nektobenthic carnivores

Characteristics of the Order

  • Conchs curved, breviconic, longiconic, or endogastrically
  • Septal necks ranging from nearly achoanitic to macrochoanitic
  • Siphuncles small to large, generally marginal more rarely subventral
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Treatise on Invertebrate Paleontology, Part K (1964):

  • Breviconic, longiconic, or endogastrically curved conchs with small to large, generally marginal, more rarely subventral or central siphuncles with posterior part filled by simple or complex endocones. Septal necks ranging from nearly achoanitic to macrochoanitic.

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