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


Genus Terebratalia Beecher, 1895, p. 380

[= Pacifithyris Hatai, 1938, p. 98 : type = Terebratalia xanthica Dall, 1920, p. 346]

[Type species = Terebratula transversa Sowerby, 1846, p. 94 (= Magasella radiata Dall, 1877]

Medium to large, outline extremely variable from subcircular to transversely oval, mildly unisulcate, ornamentation highly variable from smooth to costate; beak short, suberect, strongly attrite, beak ridges sharp, foramen large, mesothyrid, deltidial plates disjunct. Pedicle collar short, dental plates ventrally recessive, lateral umbonal cavities narrow and tending to infill with secondary shell. Cardinal process transverse-oval myophore; cardinalia strong with some median shell thickening, dorsal adjustor scars impressed on thickened inner socket ridges, crura fairly long, slender, roughly circular in cross section; loop tra- becular with very slender, lateral connecting bands extending from low median septum.

Eocene - Present

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

    Extant Species of Terebratalia
  • T. transversa (Sowerby, 1846)
  • T. coreanica (Adams et Reeve, 1850)
  • T. gouldi (Dall, 1891)
  • T. xanthica (Dall, 1920)
  • Diagnosis

    Terebratalia transversa   (Sowerby, 1846)

    Type locality: “Vancouver island, Canada.”
    Depth range: intertidal - 1800 m.

    T. caurina Gould, 1850
    T. transversa v. rubescens Dall, 1910
    T. hemphilli Dall, 1902

    Diagnose in preparation -