Arcopagia balaustina
| Arcopagia balaustina | ||||||||||||
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![Arcopagia balaustina (from GB Sowerby II, 1859: Plate 3, Fig. 6 [1])](https://de.wikipedia.org/wiki/Datei:GBSowerbyII_pl3_fig6_Arcopagia_balaustina.png)
Arcopagia balaustina (from GB Sowerby II, 1859: Plate 3, Fig. 6) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Arcopagia balaustina | ||||||||||||
| ( Linnaeus , 1758) |
Arcopagia balaustina is a mussel from the family of tellins (Tellinidae), also in the North Sea is native.
features
The housing, which is up to 19 mm long, is only slightly expanded, has the same hinges and is only very slightly uneven. The vertebrae are just a little behind the center line (in relation to the length of the case). The outline of the housing is rounded to slightly transverse elliptical. The length to width ratio is usually less than 1.1. The posterior dorsal margin is slightly shorter than the anterior dorsal margin. The posterior and anterior dorsal margins are almost straight and form an angle of about 110 °. They each drop steeply to the widely rounded rear or front end. The rear end of the ventral margin shows a slight kink.
The ligament is a sunken, thin, brown band behind the vertebrae. It extends to about a third of the length of the posterior dorsal margin. The lunula is narrow and lanceolate. It is smooth and reaches about half the length of the ligament. The right and left flaps each have two cardinal teeth. In the right valve the posterior cardinal tooth is furrowed and bilobed, In the left flap the anterior cardinal tooth is furrowed and bilobed. There is also a weak anterior and a weak posterior lateral tooth. In the right valve, the anterior lateral tooth is long and narrow, the base lies directly in front of the anterior cardinal tooth, and there is also a small posterior lateral tooth. The two sphincters are roughly the same size. The jacket book is deep, tongue-shaped and rises diagonally upwards. The ventral edge of the jacket book and the ventral jacket edge are separated.
The whitish to light yellow skin is quite firm, but thin-walled and translucent. The ornamentation consists of approx. 70 thin ribs parallel to the edge at regular intervals. In between there are finer growth strips. The inner edge of the case is smooth. Occasionally there are radial rays in pink or reddish brown on the surface as well as slightly darker zones parallel to the edge. The rays of different widths usually become clearer towards the edge of the housing and can unite. The inside of the shell is whitish-glossy, and colored orange or light yellow, especially in the wider vertebral area. The thin periostracum is translucent, the surface has a silky sheen.
The gray-white soft body is semi-transparent, as are the long and flexible siphons that are not grown together. The foot is a strong digging foot.
Similar species
The thick-shelled Tell mussel ( Arcopagia crassa ) has a much thicker shell, the vertebrae are more pointed. In addition, the housing is clearly unevenly hinged.
Geographical distribution and habitat
The distribution area of Arcopagia balaustina stretches from the British Isles along the Eastern Atlantic across West Africa to the mouth of the Congo . It has also been found in the Mediterranean Sea , the Sea of Marmara and the waters around Madeira and the Canary Islands .
It lives in muddy, sandy and gravelly soils from below the low water line to a depth of 750 meters. It lives buried in the sediment and extends the siphons to the surface of the sediment. The animals ingest organic detritus with the very long and flexible inlet siphon.
Taxonomy
The taxon was introduced into scientific literature in 1758 by Carl von Linné . It is the type species of the (sub) genus Arcopella Thiele, 1935. Arcopella was and is still regarded by some authors as a subgenus of Arcopagia , or even as an independent genus. The MolluscaBase puts Arcopella in the synonymy of Arcopagia and lists the species as Arcopagia balaustina Linnaeus, 1758.
supporting documents
literature
- 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. 127/8)
- Guido Poppe. Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 pp., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 109)
On-line
- Marine Bivalve Shells of the British Isles: Arcopella balaustina (Linnaeus, 1758) (site of the National Museum Wales, Department of Natural Sciences, Cardiff)
- Marine Species Identification Portal: Arcopagia balaustina (Linné, 1758)
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 3)
- ^ Carl von Linné: Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. Pp. 1-824, Holmia / Stockholm, Salvius, 1758. Online at www.biodiversitylibrary.org (p. 676).
- ↑ MolluscaBase: Arcopagia balaustina (Linnaeus, 1758)
