''Dallina'' is a genus of small to average size
lampshells (maximum long).
It is known since the
Miocene.
Description
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.
Taxonomy
Nine extant species are recognized (though one has recently been synonymized), these are listed below:
* ''
Dallina septigera'' (Lovén, 1845), Type species of genus, from northeastern Atlantic.
* ''
Dallina elongata
''Dallina'' is a genus of small to average size lampshells (maximum long). It is known since the Miocene.
Description
Small to large, triangular to subquadrangular in outline; rectimarginate to paraplicate; beak erect, without beak ridges; ...
'' Hatai, 1940, recorded from
Sea of Japan.
* ''
Dallina eltanini
''Dallina'' is a genus of small to average size lampshells (maximum long). It is known since the Miocene.
Description
Small to large, triangular to subquadrangular in outline; rectimarginate to paraplicate; beak erect, without beak ridges; ...
'' Foster, 1974, southern Pacific, near Antarctica.
* ''
Dallina floridana'' (Pourtalès, 1867), recorded from the Gulf of Mexico and Bahamas.
* ''
Dallina obessa'' Yabe & Hatai, 1934, recorded from Sea of Japan.
* ''
Dallina parva'' Cooper, 1981, recorded from northeast Atlantic (
Bay of Biscay
The Bay of Biscay (), known in Spain as the Gulf of Biscay ( es, Golfo de Vizcaya, eu, Bizkaiko Golkoa), and in France and some border regions as the Gulf of Gascony (french: Golfe de Gascogne, oc, Golf de Gasconha, br, Pleg-mor Gwaskogn), ...
).
* ''Dallina profundis'' Konjukova, 1957 (junior synonym of ''
Glaciarcula spitzbergensis''
)
* ''
Dallina raphaelis'' (Dall, 1970), recorded from off Japan.
* ''
Dallina tasmaniaensis'' Verhoeff, 2023, southeastern Australia.
* ''
Dallina triangularis
''Dallina'' is a genus of small to average size lampshells (maximum long). It is known since the Miocene.
Description
Small to large, triangular to subquadrangular in outline; rectimarginate to paraplicate; beak erect, without beak ridges; ...
'' Yabe & Hatai, 1934, recorded from off Japan and possibly Lau Ridge.
References
{{Taxonbar, from=Q3542846
Terebratulida
Brachiopod genera
Extant Miocene first appearances