Sous-embranchement (subphylum) des Rhynchonelliformea  
Classe des Rhynchonellata 
Ordre des Terebratulida 

Sous-ordre des Terebratulidina 
Super-famille des Terebratuloidae 
Super-famille des Dyscolioidae 
Super-famille des Cancellothyroidea 

Genus Abyssothyris Thomson, 1927
[Type species= Terebratula wyvilli Davidson, 1878 (p. 436)]

Small to medium, oval to subpentagonal in outline, ventribiconvex, smooth, thin shelled; anterior commissure unisulcate; beak small, suberect; foramen large, permesothyrid; symphytium partly visible; pedicle collar short, teeth small; cardinal process small, semielliptical, outer hinge plates narrowly triangular, tapering anteriorly to bluntly pointed crural processes located at midloop; crural bases narrow; transverse band broad, gently folded medially, anterior part of loop variable, anterolateral extremities rounded to subangular.
Lophophore plectolophous with small median coil.

Miocene - Present

Diagnosis from volume 5 of the
Treatise on Invertebrate Paleontology (2006)

Extant Species of Abyssothyris
  • A. wyvillei (Davidson, 1878)
  • Diagnosis

    Abyssothyris wyvillei   (Davidson, 1878)

    Type locality: “42°41'S, 134°10'E, depth 2,600 fathoms” [1,829 m]
    Depth range: 284-6179 m

    Terebratula wyvilli Davidson, 1878
    Liothyris wyvillii Davidson, 1886
    Terebratella (Liothyrina) wyvillei Möricke, 1895
    Liothyrina wyvillii Dall, 1908
    Gryphus wyvillii Dall, 1921
    Abysothyris wyvillei Thomson, 1927
    Abysothyris elongata Cooper, 1972
    Abyssothyris sp Cooper, 1973
    Abysothyris cf. A. wyvillei Foster, 1974
    Liothyrella sp. A Foster, 1974 (see Foster, 1998)
    Abysothyris atlantica Cooper, 1977 (see Laurin, 1997)
    Abyssothyris? parva Cooper, 1977 (see Laurin, 1997)
    Abyssothyris sp 1 & 2 Cooper, 1977
    Abyssothyris? sp Cooper, 1982
    Abyssothyris cf. elongata Cooper, 1982

    Diagnose in preparation -