Dallina
Genus of brachiopods
From Wikipedia, the free encyclopedia
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.
| Dallina Temporal range: | |
|---|---|
| |
| Dallina septigera, 23mm wide, recent | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Brachiopoda |
| Class: | Rhynchonellata |
| Order: | Terebratulida |
| Family: | Dallinidae |
| Subfamily: | Dallininae |
| Genus: | Dallina Beecher, 1893 |
| Species | |
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See text | |
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]
Dallina septigera, brachial valve, 24mm long, near the Philippines
pedicle valve
anterior view
interior view
lateral view
Taxonomy
Nine extant species are recognized (though one has recently been synonymized),[3] these are listed below:
- Dallina septigera (Lovén, 1845), Type species of genus, from northeastern Atlantic.[4]
- Dallina elongata Hatai, 1940, recorded from Sea of Japan.[4]
- Dallina eltanini Foster, 1974, southern Pacific, near Antarctica.[4]
- Dallina floridana (Pourtalès, 1867), recorded from the Gulf of Mexico and Bahamas.[4]
- Dallina obessa Yabe & Hatai, 1934, recorded from Sea of Japan.[4]
- Dallina parva Cooper, 1981, recorded from northeast Atlantic (Bay of Biscay).[4][5]
- Dallina profundis Konjukova, 1957 (junior synonym of Glaciarcula spitzbergensis[6])
- Dallina raphaelis (Dall, 1970), recorded from off Japan.[4]
- Dallina tasmaniaensis Verhoeff, 2023, southeastern Australia.[6]
- Dallina triangularis Yabe & Hatai, 1934, recorded from off Japan and possibly Lau Ridge.[4][6]