''Dallina'' is a genus of small to average size lampshells (maximum long). It is known since the

Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...

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. File:Dallina septigera brachial.jpg, ''Dallina septigera'', brachial valve, 24mm long, near the Philippines File:Dallina septigera pedicle valve.jpg, pedicle valve File:Dallina septigera anterior.jpg, anterior view File:Dallina septigera internal 2.jpg, interior view File:Dallina septigera lateral.jpg, lateral view

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; f ...

'' Hatai, 1940, recorded from

Sea of Japan The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and the mainland of the Russian Far East. The Japanese archipelago separates the sea from the Pacific Ocean. Like the Mediterranean Sea, i ...

. * ''

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; f ...

'' 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 ''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; f ...

'' Cooper, 1981, recorded from northeast Atlantic ( Bay of Biscay). * ''Dallina profundis'' Konjukova, 1957 (junior synonym of '' Glaciarcula spitzbergensis'') * ''

Dallina raphaelis ''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; f ...

'' (Dall, 1970), recorded from off Japan. * ''

Dallina tasmaniaensis ''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; f ...

'' 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; f ...

'' Yabe & Hatai, 1934, recorded from off Japan and possibly Lau Ridge.

References

{{Taxonbar, from=Q3542846 Terebratulida Brachiopod genera Extant Miocene first appearances