Phylum: Brachiopoda
Class: Rhynchonellata
Order: Orthida
Family: Glyptorthidae (Schuchert & Cooper, 1931)
Cincinnatian genera: Glyptorthis

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Alternate Spelling: Glyptorthinae
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Geologic Range
Lower Ordovician (Arenig) – Middle Silurian (Wenlock)

Common Paleoecology
Glyptorthidae is an extinct family of stationary epifaunal suspension feeders

Characteristics of the Family

  • Medium to large brachiopod
  • Subquadrate shape and generally has obtuse cardinal extremities
  • Costate to Costellate ornamentation with strong concentric ornamentation developed as lamellose frills or spines
  • Delthyrium and notothyrium of variable width>/li>
  • Short dorsal interarea
  • Dental plates normally present
  • Relatively broad adductor track which is rarely shorter than diductor scars
  • Generally well-developed callist
  • Well developed notothyrial platform which normally supports the simple cardinal process
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Treatise on Invertebrate Paleontology, Part H, Vol. 3 (2000):

  • Systematics
      Medium to large, subquadrate usually with obtuse cardinal extremities, costate to costellate with strong concentric ornamentation developed as lamellose frills or even drawn out as spines; delthyrium and notothyrium varying in width, exceptionally covered, short dorsal interarea variably orientated; dental plates normally present, recessive, ventral muscle scar variable, with relatively broad adductor track rarely shorter than diductor scars, pedicle callist usually well developed; brachiophores variably structured and disposed, well-developed notothyrial platform normally supporting simple cardinal process and invariably prolonged anteriorly as median ridge; quadripartite dorsal scars commonly with anterior pair larger than posterior pair; sporadically impressed mantle canals with saccate ventral and digitate dorsal systems.

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