Phylum: Brachiopoda
Class: Lingulata
Order: Lingulida
Family: Pseudolingulidae (Holmer, 1991)
Cincinnatian Genera: Pseudolingula

Geologic Range
Middle Ordovician – Early Carboniferous

Common Paleoecology
Pseudolinguilidae is an extinct family of facultatively mobile infaunal suspension feeders

Description of the Family

  • Shell elongate, subrectangular to subelliptical.
  • Ventral pseudointerarea with small, triangular propareas lacking flexure lines
  • Dorsal posterior margin thickened
  • Poorly developed or absent dorsal vascula media
  • Umbonal muscle bisected by the pedicle nerve
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Treatise on Invertebrate Paleontology, Part H (2) (2000):

  • Shell elongate, subrectangular to elongate subelliptical, subequivalved to equivalved; ventral pseudointerarea with small, triangular propareas lacking flexure lines; dorsal posterior margin thickened, forming reduced, undivided, anacline to catacline pseudointerarea, never extending as plate into valve; both valves with paired umbonal muscle scars; ventral valve with impression of pedicle nerve bisecting umbonal scar; dorsal scars of central and anterior lateral muscles closely spaced; mantle canal system baculate or possibly bifurcate, vascula lateralia converging anteriorly; vascula media absent.

Holmer (1991):

  • The pseudolingulids are characterized by by the presence of of converging vascula lateralia, poorly developed or absent dorsal vascula media, and reduced pseudointerareas, in addition to a paired umbonal muscle, bisected by the pedicle nerve.

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Pseudolingula sp.