Round trunk shell
| Round trunk shell | ||||||||||||
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Round trunk shell ( Hemilepton nitidum ) (from Forbes & Hanley 1853: Plate 36, Fig. 3,4) |
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| Scientific name | ||||||||||||
| Hemilepton nitidum | ||||||||||||
| ( Turton , 1822) |
The round trunk clam ( Hemilepton nitidum ) is a type of clam from the Lasaeidae family .
features
The case is equally hinged, but slightly unequal. It is rounded square in outline and slightly elongated towards the front. The vertebrae sit behind the midline. It becomes up to three millimeters long, exceptionally up to four millimeters. Fritz Nordsieck states: 2.5 mm in length, 2 mm in height and 1 mm in thickness (in cross section). It is clearly elongated. The anterior and posterior dorsal edges are slightly shouldered. The rear edge is slightly less curved than the front end. The ventral margin is well rounded. The small ligament lies internally in a shallow depression behind the vertebrae. The lock has a single main tooth in the right flap and two posterior and anterior posterior teeth. In the left flap there is a strong main tooth and only one anterior and posterior posterior tooth. The surface line is not indented. The muscle impressions are only indistinct. The inner edge is smooth.
The whitish skin is thin and translucent. The surface is essentially smooth, apart from fine growth lines parallel to the edge. In the area of the vertebra there are microscopic pits anterior to the prodissoconch. The periostracum is a thin, light yellow coating.
Geographical distribution and habitat
The distribution area of Hemilepton nitidum extends from Northern Norway to North Africa and into the Mediterranean and Black Sea .
The species occurs on coarse sandy to gravelly sediments from shallow water to a depth of about 150 meters. Fritz Nordsieck specifies a depth range of 18 to 216 meters. The animals presumably live as commensals on or on crabs of the species Upogebia deltaura (Leach, 1816) and Upogebia stellata (Montagu, 1808).
Taxonomy
William Turton established this taxon in the original combination Lepton nitidum in 1822 . In the past it was also placed in the genera Erycina Lamarck, 1805 and Semierycina Monterosato in Cossmann, 1911. The MolluscaBase assigns the species to the genus Hemilepton Cossmann & Peyrot, 1911. MolluscaBase called following synonyms : Erycina prismatica Cossmann & Peyrot, 1912, kellia compressa Milaschewitsch, 1909, Lepton convexum Clark, 1852, Lepton nitidum var. Laevis Jeffreys, 1864, Lepton nitidum var. Lineolata Jeffreys, 1864 and Lepton nitidum var. Pisidialis Jeffreys , 1864.
supporting documents
literature
- Paul Chambers: Channel Island Marine Molluscs: An Illustrated Guide to the Seashells of Jersey, Guernsey, Alderney, Sark and Herm. 321 pp., Charonia Media, 2008, ISBN 978-0-9560655-0-6 , p. 230 (as Semierycina nitida )
- Fritz Nordsieck : The European sea shells (Bivalvia). From the Arctic Ocean to Cape Verde, the Mediterranean Sea and the Black Sea. 256 p., Gustav Fischer Verlag, Stuttgart 1969 (p. 89 as Lepton nitidum )
- Guido Poppe and Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 p., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 86 as Semierycina nitida )
On-line
Individual evidence
- ↑ Fritz Gosselck, Alexander Darr, Jürgen HJ Jungbluth, Michael Zettler: Trivial names for mollusks of the sea and brackish water in Germany. Mollusca, 27 (1): 3-32, 2009 PDF
- ^ William Turton: Conchylia insularum Britannicarum. The shells of the British islands. 279 pp., 20 plates, MA Nattali, London 1822 Online at www.biodiversitylibrary.org (p. 63)
- ↑ a b MolluscaBase: Hemilepton nitidum (Turton, 1822)