Phylum: Brachiopoda
Class: Lingulata
Order: Lingulida
Family: Trematidae (Schuchert, 1893)
Cincinnatian Genera: Trematis, Schizocrania

Geologic Range
Ordovician – Devonian

Common Paleoecology
Trematidae is an extinct family of stationary low-level epifaunal suspension feeders.

Description of the Family

  • Ornamented shell with superficial pits
  • Beak of dorsal valve marginal
  • Protruding beyond beyond ventral valve
  • Pedicle opening extending to posterior of ventral valve
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Treatise on Invertebrate Paleontology, Part H, Vol. 2 (2000):

  • Shell usually ornamented with large, superficial pits; beak of dorsal valve marginal, protruding
    beyond ventral valve; pedicle opening usually extending to posterior margin of ventral valve in all growth

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