Banded clam
| Banded clam | ||||||||||||
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![Banded clam (Clausinella fasciata) (from GB Sowerby II 1859: Plate 4, Fig. 14 [1])](https://de.wikipedia.org/wiki/Datei:Venus_fasciata_(Sowerby).jpg)
Banded clam ( Clausinella fasciata ) (from GB Sowerby II 1859: Plate 4, Fig. 14) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Clausinella fasciata | ||||||||||||
| ( da Costa , 1778) |
The banded clam ( Clausinella fasciata ) is a sea-living clam - a species of the clams family (Veneridae). It is the type species of the genus Clausinella Gray, 1851.
features
The flat, flattened case is almost triangular in outline; it becomes up to 26 mm long. It is unequal, the prominent, forward-facing vertebrae sit in front of the midline. The anterior dorsal margin is clearly concave while the posterior dorsal margin is slightly convex. The ventral margin is well rounded. The inner edge of the case is very finely notched. The lock consists of three main teeth in each flap. There are no posterior teeth. The lunula is flat and lanceolate or heart-shaped, but not very distinct. The large, narrow area is elliptical and almost reaches the rear end. The sunken ligament extends to about a third of the posterior dorsal margin. The two sphincters are approximately the same size and clearly outlined. The surface line is indented in a flat U-shape.
The shell is thick and tight. The ornamentation consists of a few (around 10 to 15) lamellae or bulges parallel to the edge with fine growth strips in between. The surface is very variable in color, from whitish, yellowish, violet or lavender, also brownish and reddish, occasionally with somewhat darker bands, lines, rays, stripes or spots on a lighter background. The periostracum is thin and glossy. The inside of the shell is white, occasionally tinged with purple.
The edge of the coat is reddish with whitish fringes. The short, yellowish siphons are fused together except for the tips. At the tips they are provided with whitish fringes. The thick, whitish foot is lanceolate.
Similar species
The rough clam ( Venus verrucosa ) has numerous bulges parallel to the edge that are interrupted warty. Circomphalus casina has significantly stronger ridges and ribs parallel to the edge .
Geographical distribution, habitat and way of life
The distribution area of the banded clam stretches from northern Norway to the Mediterranean and the Canary Islands .
It lives in coarse, sandy gravel or sandy soils from about 6 to 110 meters water depth. It digs shallow in these soils.
Taxonomy
The taxon was established in 1778 by Emanuel Mendez da Costa as Pectunculus fasciatus . It is the type species of the genus Clausinella Gray, 1851. MolluscaBase lists a number of synonyms : Venus brongniartii Payraudeau, 1826, Ortygia costata T. Brown, 1827, Venus biradiata Risso, 1826, Venus busschaerdi Requien, 1848, Venus decipiens Hanley, 1845 , Venus duminyi Requien, 1848, Venus fasciata var. Lilacina Bucquoy, Dautzenberg & Dollfus, 1893, Venus fasciata var. Raricostata Jeffreys, 1864, Venus fasciata var. Rudis Bucquoy, Dautzenberg & Dollfus, 1893, Venus fasciata var. Zigzag Bucquoy, Dautzenberg var & Dollfus, 1893, Venus paphia Montagu, 1803, Venus phliippiae Requien, 1848 and Venus scalaris Bronn, 1832.
supporting documents
literature
- S. Peter Dance, Rudo von Cosel (arrangement of the German edition): The great book of sea shells. 304 p., Verlag Eugen Ulmer, Stuttgart, 1977 ISBN 3-8001-7000-0 (p. 269/70)
- Rudolf Kilias: Lexicon marine mussels and snails. 2nd edition, 340 p., Verlag Eugen Ulmer, Stuttgart 1997 ISBN 3-8001-7332-8 (p. 68)
- 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. 114)
- Guido Poppe & Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 p., Verlag Christa Hemmen, Wiesbaden 1993 (2000, un. Reprint). ISBN 3925919104 (p. 121)
On-line
- Marine Bivalve Shells of the British Isles: Clausinella fasciata (da Costa, 1778) (site of the National Museum Wales, Department of Natural Sciences, Cardiff)
- Marine Species Identification Portal: Clausinella fasciata (da Costa)
- Clausinella fasciata (da Costa, 1778) Conchological Society of Great Britain and Ireland, (accessed May 17, 2017).
Individual evidence
- ↑ George Brettingham Sowerby II : Illustrated index of British shells. containing figures of all the recent species, with names and other information. XV S., XXIV plate. London, Simpkin, Marshall & Co., 1859 Online at www.biodiversitylibrary.org (plate 4)
- ^ Emanuel Mendez da Costa: Historia naturalis testaceorum Britanniæ, or, the British conchology; containing the descriptions and other particulars of natural history of the shells of Great Britain and Ireland: illustrated with figures. In English and French. - Historia naturalis testaceorum Britanniæ, ou, la conchologie Britannique; contenant les descriptions & autres particularités d'histoire naturelle des coquilles de la Grande Bretagne & de l'Irlande: avec figures en taille douce. En anglois & françois. SI-XII, 1-254, London, Millan, White, Emsley & Robson, 1778 Online at www.biodiversitylibrary.org (p. 210)
- ↑ MolluscaBase: Clausinella fasciata (da Costa, 1778)
