Sous-embranchement (subphylum) des Linguliformea
Classe des Lingulata
Ordre des Lingulida
Super-famille des Discinoidea
Famille des Discinidae


Genus Discinisca Dall, 1871
[Type-species = Orbicula lamellosa Broderip, 1833]
Shell dorsibiconvex to convexoconcave, subcircular; ornamentation of fine growth lines that may become lamellose peripherally, with or without fine ribs; ventral valve with large depressed area around pedicle track, internally with small triangular median septum extending posteriorly from apex on to listrium; lophophore spirolophous.
?Triassic, Lower Jurassic - Present

Diagnosis modified, from volume 2 of the
Treatise on Invertebrate Paleontology

Extant Species of Discinisca
  • D. lamellosa (Broderip, 1833)
  • D. tenuis (Sowerby)
  • D. laevis ( Sowerby, 1822)
  • D. rikurenensis (Hatai, 1940)

  •  FIGURES : Discinisca