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 Notosaria Cooper, 1959
[Type species= Terebratula nigricans Sowerby, 1846, p. 91]
Subpentagonal, uniplicate, dorsal fold low; costate, growth lines developing anteriorly, beak nearly straight to suberect; large hypothyrid foramen, deltidial plates disjunct. Median dorsal ridge low; cardinal process wide, transversely triangular.
Eocene - Present

Diagnosis from volume 4 of the
Treatise on Invertebrate Paleontology (2002)


Extant Species of Notosaria
  • N. nigricans (Sowerby, 1846)
  • N. reinga Lee & Wilson, 1979
  • Diagnosis

    Notosaria nigricans  (Sowerby, 1846)

    Type locality: xx
    Depth range: 9 - 500 m


    Terebratula nigricans Sowerby, 1846
    Rhynchonella nigricans Dall, 1870
    Hemithiris nigricans Dall, 1973
    Tegulorhynchia nigricans Champan & Crespin, 1923
    Notosaria nigricans Cooper, 1959

    Diagnose in preparation -


    Should be added:
  • Muscle disposition: see Fig. in front -


    Disposition of the pedicle and pedicles muscles - sagittal section
    (from Richardson, 1979


    Muscle attachment (from Richardson, 1979)