Phylum: Brachiopoda
Class: Craniata
Order: Craniida
Family: Craniidae (Menke, 1828)
Cincinnatian Genera: Petrocrania , Philhedra

Geologic Range
Ordovician – Holocene

Common Paleoecology
Crannidae is an extinct family of stationary, epifaunal suspension feeders

Description of the Family

  • Calcified dorsal valve
  • Punctate
  • Shell growth generally holoperipheral, rarely mixoperipheral
  • Ventral valve convex or encrusting
  • Dorsal valve convex to subconical
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Treatise on Invertebrate Paleontology, Part H, Vol. 2 (2000):

  • Dorsal valve invariably calcified, punctuate; ventral valve in some taxa without secondary shell or entirely periostracal; mantle setae present in recent forms; shell growth generally holoperipheral, rarely mixoperipheral; dorsal valve convex to subconical, ventral valve plane to convex or encrusting; dorsal body wall of recent forms attached to dorsal valve in five separate areas; attachment scars of dorsal internal oblique muscles situated posterolaterally; mantle canal system pinnate, only rarely with vascula media.

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