Sous-embranchement (subphylum) des Rhynchonelliformea
Classe des Rhynchonellata
Ordre des Terebratulida
Sous-Ordre des Terebratellidina
Super-famille des Laqueoidea


Genus Tythothyris Zezina, 1979

[Type species= Tythothyris rosimarginata Zezina, 1979 (p. 224)]

Small, smooth, biconvex, rectimarginate to weakly sulcate; similar to juvenile Diestothyris but crura and descending loop branches not developed; septal pillar with ventrally curved, ascending lamellae that do not unite, with small, posteriorly directed flanges at apices of ascending lamellae.


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

Extant Species of Tythothyris
  • T. rosimarginata Zezina, 1979
  • Diagnosis

    Tythothyris rosimarginata  Zezina, 1979

    Type locality: Bering Island, depth 20 m [st. 184, sample 420]
    Depth range: 5 - 400 m

    Tythothyris rosimarginata Zezina, 1979, p. 102
    Diestotrhyris frontalis aleutica Zezina, 1970 p. 451 (not Magasella aleutica Dall, 1872 p. 303)

    Diagnosis (Zezina, 1979)

    in Russian

    from Zezina (1979)