Dallina

Dallina Temporal range: Miocene–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Dallina septigera, 23mm wide, recent
Scientific classification
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	Rhynchonellata
Order:	Terebratulida
Suborder:	Terebratellidina
Superfamily:	Terebratelloidea
Family:	Dallinidae
Genus:	Dallina Beecher, 1893
Species
See text

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
• 
  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]

References

1. 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.
2. 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.
3. "WoRMS - World Register of Marine Species - Dallina Beecher, 1893". www.marinespecies.org. Retrieved 2023-01-16.
4. Zezina, ON (2010). "Check-list of Holocene brachiopods annotated with geographical ranges of species". Paleontological Journal. 4: 1176–1199.
5. Cooper, GA (1981). "Brachiopoda from the Gulf of Gascogne, France (Recent)". Smithsonian Contributions to Paleobiology. 44: 1–35.
6. Verhoeff, Tristan Joseph (2023). "New records and descriptions of recent Australian brachiopods (Terebratulida, Dallinidae and Aulocothyropsidae; and Rhynchonellida, Frieleiidae)". Australian Journal of Taxonomy. 11: 1–29.