Asperarca nodulosa
| Asperarca nodulosa | ||||||||||||
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Asperarca nodulosa (from Kobelt, 1891: Plate 7, Fig. 6.7) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Asperarca nodulosa | ||||||||||||
| ( OV Müller , 1776) |
Asperarca nodulosa is a type of mussel from the family of ark mussels (Arcidae).
features
The moderately convex arched, equilateral case is approximately elongated-rhombic in outline with a maximum length of 1.5 cm. The rear part of the housing is strongly drawn out; Overall, the case is about twice as long as it is high. The vertebrae protrude beyond the almost straight dorsal margin and are about a quarter of the total length of the dorsal margin from the anterior end. The rear housing part is therefore more than twice as long as the front housing part. The front edge merges continuously into the ventral edge. The rear edge and ventral edge, on the other hand, form an acute angle, the transition between the rear edge and the ventral edge is tightly rounded.
The ligament lies outside between the vertebrae. The edge of the lock is straight. The elongated, slightly curved teeth sit on a narrow plate and are slightly tilted inwards. They are divided into two groups, interrupted by a short toothless area under the vertebrae. There are up to 7 teeth in the front area of the lock plate and up to 14 teeth in the rear area.
The shell is firm and not translucent. The ornamentation consists of distinct concentric and radial ribs and backs. In the middle field, the concentric ribs dominate, in the front field the radial ribs, which are knotty to prickly here. The periostracum is thin and straw yellow. It is usually only preserved on the edge of the case. The edges of the case therefore appear to be irregular and frayed.
There are two sphincters of different sizes, the anterior sphincter being slightly smaller than the posterior sphincter.
Geographical distribution and habitat
The species occurs on both sides of the North Atlantic from the Arctic to the Mediterranean . It lives in deeper water from about 200 m to 4000 m depth, mostly on the outer continental margin from 200 to 500 m water depth.
They live with thin linen attached to deep sea corals, stones and rubble.
Taxonomy
The species was first scientifically described in 1776 by Otto Friedrich Müller as Arca nodulosa . It appears in the literature as Arca nodulosa , Acar nodulosa and Barbatia nodulosa . The World Register of Marine Species places them in the genus Asperarca Sacco, 1898; it is the type species of this genus. Synonyms are: Arca scabra Poli, 1795 and Arca aspera Philippi, 1844.
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. 21 as Acar nodulosa )
- Guido Poppe and Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 pp., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3925919104 (p. 43 as Barbatia nodulosa )
- Rainer Willmann: Mussels and snails of the North and Baltic Seas. 310 p., Neumann-Neudamm, Melsungen 1989, ISBN 3-7888-0555-2 (p. 109 as Arca nodulosa )
Web link
Individual evidence
- ↑ Otto Friedrich Müller: Zoologiae Danicae prodromus, seu animalium Daniae et Norvegiae indigenarum characteres, nomina, et synonyma imprimis popularium. S. I-XXXII, 1-274, Havniae / Copenhagen, Hallager, 1776 Online at www.biodiversitylibrary.org (p. 248).
- ^ World Register of Marine Species: Asperarca nodulosa (OF Müller, 1776) .
