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


Genus Dallina Beecher, 1895
[Type species= Terebratula septigera Lovén, 1846 (p. 29)]

Small to large, triangular to subquadrangular in outline; rectimarginate to paraplicate; beak erect, without beak ridges; foramen small to large, mesothyrid, attrite, symphytium concave. Hinge teeth small, weak; pedicle collar very short. Cardinalia lamellar with excavate inner and outer hinge plates separated by narrow crural bases; inner hinge plates converging on median septum to form V-shaped septalium; cardinal process not differentiated; median septum low anteriorly, extending beyond midvalve; adult loop teloform.

Miocene - Present

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

Extant Species of Dallina
  • D. septigera (Lovén, 1846)
  • D. floridana (Pourtalès, 1867)
  • D. raphaelis (Dall, 1870)
  • D. triangularis Yabe & Hatai, 1934
  • D. obessa Yabe & Hatai, 1934
  • D. elongata Hatai, 1940
  • D. profundis Konjukova, 1957
  • D. eltanini Foster, 1974
  • D. parva Cooper, 1981

  • Diagnosis



    Dallina triangularis   Yabe & Hatai, 1934

    Type locality: "Sôyô-maru station 419, 32°12'10"N., 129°49'45"E., 402 m, bottom temp. 9.6°C."
    Depth range: 356 - 402 m.

    Diagnosis (Yabe & Hatai, 1934, p. 662, fig. 31-35)

    Shell resembling D. raphaelis (Dall), but differing in possessing a strongly triangular shell, being broadest anteriorly, more stronglycurved lateral commissure, small shell and different coloration. Length ca. 23.5, width 21, depth 16 mm.


        Facsimile of the text-fig of Yabe & Hatai (1934) - disposition modified >>

    Dallina eltanini   Foster, 1974

    Type locality: “Stations USC 1345 (54°50'S, 129°48'W): 915-1153 m.”
    Depth range: 339 - 1208 m

    Diagnosis in preparation -