Dallina
Dallina |
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File:Dallina septiger internal 1.jpg | |
Dallina septiger, 23mm wide, recent | |
Scientific classification | |
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Superfamily: |
Terebratelloidea
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Family: |
Dallinidae
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Genus: |
Dallina
Beecher, 1893
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species | |
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Dallina is a genus of small to average size lampshells (maximum 35 millimetres or 1.4 inches long).[1] 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.[2]
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Dallina septigera brachial.jpg
Dallina septigera, brachial valve, 24mm long, near the Philippines
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Dallina septigera pedicle valve.jpg
pedicle valve
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Dallina septigera anterior.jpg
anterior view
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Dallina septigera internal 2.jpg
interior view
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Dallina septigera lateral.jpg
lateral view