Sawtooth
| Sawtooth | ||||||||||||
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Saw tooth ( Donax vittatus ) |
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| Scientific name | ||||||||||||
| Donax vittatus | ||||||||||||
| ( da Costa , 1778) |
The banded wedge ( Donax vittatus ), also Toothed Wedge shell , banded Sägemuschel or stump shell is in the North Atlantic common mussel species from the family of suitcase shells (Donacidae).
features
The flat housings, which have the same flaps, are up to 4 cm long. In outline, they form a somewhat distorted triangle with rounded corners. They are unequal, the small, opisthogyric vertebrae sit behind the center line in relation to the length of the case. The brown ligament is small but protruding. The lock has two main teeth in both flaps. In the left valve the anterior cardinal tooth is bilobed, the posterior cardinal tooth is only weakly developed. In addition, there are weak anterior and posterior lateral teeth. In the right valve, the anterior cardinal tooth is short and the posterior cardinal tooth is two-pointed. There are two posterior and one anterior lateral teeth. The surface line is deeply indented, the bay extends to the center line. The foot is very large and strong.
The shell is thin but tightly skinned. Their thickness is very different. The color varies from white, pale yellow, brown, reddish to purple on the outside. The inside is usually purple in color. The ornamentation consists mainly of fine growth lines and fine radial lines. They are much stronger at the rear end than at the front end, where they can also be missing. The ventral edge of the housing is serrated. The name saw tooth comes from this characteristic. The periostracum is thin and shiny.
Geographical distribution, habitat and way of life
The distribution area extends from Norway along the coast of the east Atlantic to Mauritania. It is also found in the North and Baltic Seas, as well as in the Mediterranean and Black Seas. It has also been proven from the waters around the Canary Islands .
The saw tooth lives buried in clean sand from the lower tide line to about 20 meters water depth. If it is flushed free, it can bury itself again very quickly, within four to five seconds. The animals are five to six years old, but are sexually mature after about a year. They are of separate sex. The sex products are released into the open water where fertilization takes place. The eggs have a thin egg shell from which planktotroph larvae hatch. Under laboratory conditions, the pediveliger stage was reached after three weeks. A week later, the larva switched to metamorphosis and soil life.
Taxonomy
The species was proposed as Cuneus vittatus by Emanuel Mendes da Costa in 1778 . It is now generally accepted as belonging to the genus Donax Linnaeus, 1758.
supporting documents
literature
- Fritz Gosselck, Alexander Darr, Jürgen HJ Jungbluth, Michael Zettler: common names for mollusks of the sea and brackish water in Germany. Mollusca, 27 (1): 3-32, 2009 PDF
- Fritz Nordsieck: The European sea shells (Bivalvia). From the Arctic Ocean to Cape Verde, the Mediterranean Sea and the Black Sea. 256 pages, Gustav Fischer Verlag, Stuttgart 1969
- Guido Poppe. Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 p., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 113/4)
- Rainer Willmann: Mussels of the North and Baltic Seas. 310 p., Neumann-Neudamm, Melsungen 1989 ISBN 3-7888-0555-2 (p. 153)
On-line
Individual evidence
- ↑ L. Frenkiel, M. Mouëza: Developpement larvaire de deux Tellinacea, Scrobicularia plana (Semelidae) et Donax vittatus (Donacidae). Marine Biology, 55: 87-195, 1979 doi : 10.1007 / BF00396817
- ^ 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. 207/8)
- ↑ MolluscaBase: Donax vittatus (da Costa, 1778)
