Hemithiris Sous-embranchement (subphylum) des Rhynchonelliformea   Classe des Rhynchonellata  Ordre des Rhynchonellida  Super-famille des Pugnacoidea  Super-famille des Dimerelloidea  Super-famille des Norelloidea  Super-famille des Hemithiridoidea

Genus Hemithiris d'Orbigny, 1847

[Type species= Anomia psittacea Gmelin, 1791 (p. 3348)]

Medium, trigonal, uniplicate, finely costellate, finely striate to smooth; beak long, suberect, hypothyrid. Ventral median ridge posteriorly; dorsal median ridge low; crura long, flattened posteriorly, and with moderate concave surfaces dorsally becoming more acute at the distal ends. [Living species range from subtidal to circalittoral, even bathyal.]

Paleogene (Eocene) - Present Diagnosis from volume 4 of the Treatise on Invertebrate Paleontology (2002)

Extant Species of Hemithiris

H. psittacea (Gmelin, 1791) H. woodwardi (Adams, 1863)

Diagnosis