Sous-embranchement (subphylum) des Rhynchonelliformea
Classe des Rhynchonellata
Ordre des Terebratulida
Sous-Ordre Uncertain
Super-famille des Gwynioidea


Genus Gwynia King, 1859

[Type species = Terebratula capsula Jeffreys, 1859, p. 43]

Biconvex, notothyrium triangular, wider and larger than delthyrium. Ventral interarea narrow, triangular, apsacline; delthyrium bounded by 2 small, oval teeth. Dorsal valve interior with a pair of well-developed, arcuate, submarginal ridges extending from stout inner socket ridges; dorsal interarea anacline; cardinal process not differentiated.

Pleistocene - Present

Diagnosis from volume 6 of the Treatise on Invertebrate Paleontology (2007)

Extant Species of Gwynia
  • G. capsula (Jeffreys,1859)
  • G. macrodentata Lüter, 2008
  • Diagnosis

    Gwynia capsula  (Jeffreys,1859)

    Type locality: Gwynia was described by King (1859) from a specimen collected by Jeffreys at Etretat (Normandy, France), while G. capsula was described by Jeffreys (1859) from a collection recorded in Belfast Lough, name of Belfast Bay (Ireland).
    Depth range: 10-46 m.

    Gwynia capsula (Jeffreys,1859), p. 43

    No Diagnosis -

    Gwynia macrodentata  Lüter, 2008

    Type locality: Moore Seamount, Station 13: depth 1605-1865 m, 40°25.202'S, 179°26.816'W
    Depth range: 1605-1865 m

    Diagnosis (Lüter,2008, p. 318)

    Very small brachiopod, about 1.5 mm shell length, slightly larger than Gwynia capsula. Trocholophous lophophore with highly spiculated connective tissue. Ventral valve with massive, two- lobed teeth and broad, rather flat median septum. Shell semi-transparent, light brown, densely punctate. Short but sturdy pedicle, with both valves forming the pedicle opening.