Phylum: Brachiopoda
Class: Lingulata
Order: Lingulida
Cincinnatian Families: Trematidae, Pseudolingulidae

Geologic Range
Lower Cambrian (upper Atdabanian) – Holocene

Common Paleoecology
Lingulida is an extant order of stationary, low-level, epifaunal suspension feeders.

Characteristics of the Order

  • Smooth or pitted micro-ornamented shell
  • Inarticulate brachiopod
  • Musculature involves single or paired umbonal muscles
  • Baculate or bifurcate mantle canal system
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Treatise on Invertebrate Paleontology, Part H, Vol. 2 (2000):

  • Larval shell usually large (more than 0.3 mm across), smooth or with pitted micro-ornamentation; pedicle emerging posteriorly between valves or through foramen; musculature composed of single or paired umbonal muscle (posterior adductor in Discinoidea), three or four pairs of oblique muscles, and paired central muscles (anterior adductor in Discinoidea); mantle canal system baculate or bifurcate; dorsal vascula media usually developed; shell structure with baculate laminae.

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