Dallina
Appearance
Dallina Temporal range:
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Dallina septigera, 23mm wide, recent | |
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Superfamily: | Terebratelloidea
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Family: | Dallinidae
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Genus: | Dallina Beecher, 1893
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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 valve, 24mm long, near the Philippines
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pedicle valve
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anterior view
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interior view
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lateral view
References
- ^ a b Atkins, D. (1960). "A note on Dallina septigera (Lovèn), (Brachiopoda, Dallinidae)" (PDF). Journal of the Marine Biological Association of the United Kingdom. 3 (1): 91–99. doi:10.1017/s0025315400013126. Archived from the original (PDF) on 2014-11-29.
- ^ Moore, R.C. (1965). Brachiopoda. Treatise on Invertebrate Paleontology. Vol. Part H., Volume 2. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. pp. H835. ISBN 0-8137-3015-5.