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

    Hemithiris psittacea   (Gmelin, 1791)

    Type locality: "Habitat rarissima in mari Groenlandiam alluente,...

    Depth range: 0 - 2078 m

    Rhynchonella psittacea: Davidson (1887)
    Hemithyris psittacea: Dall (1921)
    Hemithiris psittacea: Cooper (1959, 1973)
    Hemithyris psittacea: Zezina (1997)

    Diagnose in preparation -