Bathyarca philippiana

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Bathyarca philippiana
Bathyarca philippiana (from Kobelt 1891: Plate 49, Fig. 10 [1])

Bathyarca philippiana (from Kobelt 1891: Plate 49, Fig. 10)

Systematics
Order : Arcida
Superfamily : Arcoidea
Family : Ark clams (Arcidae)
Subfamily : Bathyarcinae
Genre : Bathyarca
Type : Bathyarca philippiana
Scientific name
Bathyarca philippiana
( Nyst , 1848)

Bathyarca philippiana is a clam species from the family of ark clams (Arcidae) in the order Arcida .

features

The slightly unevenly folded, moderately inflated housing has a rounded oblong-trapezoidal outline and is up to 10 mm long (north triangle: L = 9.9 mm, H = 6.6 mm, D = 5 mm). The left flap is slightly larger than the right flap, the latter sits in the left flap. It is unequal, the powerful vertebrae sit in front of the midline (about a third from the front end). The rear part of the housing is extended. The dorsal margin is long and straight. The posterior margin is broadly rounded, the ventral margin straight or slightly curved with a slight recess in the byssus. The angle between the dorsal margin and the posterior margin is somewhat more obtuse than the angle of the dorsal margin with the anterior margin. The front edge is widely rounded, the rear edge is more narrowly rounded. The dorsal field is narrow and flat. The anterior housing field has a flat sinus that extends from the vertebrae to the ventral margin and which is more clearly defined in smaller housings.

The lock is taxodont, the moderately curved lock plate strong. The initially large teeth on the outside become smaller towards the middle. In the front part there are up to eight slightly outwardly diverging teeth, in the back there are up to 14 teeth (northern triangle: front 5, rear 10 teeth). There is no or only a very small smooth area between the two groups of teeth. The duplivincular ligament extends across the dorsal field in angular ligaments. The angles are formed by the posterior part of the dorsal field. The two sphincters are of different sizes; the anterior sphincter is only about two thirds the size of the posterior sphincter.

The whitish skin is thin and translucent but not fragile. The ornamentation consists of numerous fine, radial ribs, which are interrupted by growth stops. The ribs are covered with short, thin scales, which are most strongly developed in the rear housing field. However, they are mostly abraded, most likely still preserved at the edges of the case. When the scales are rubbed off, the ribs appear knotty. They intersect with strong growth strips. The inner edge of the case on the larger left keys is slightly notched, the inner edge of the right key is smooth. The periostracum is drawn out into straw-colored bristles, which are often arranged in rows, especially at the rear and front ends.

Geographical distribution, way of life and habitat

The distribution area of ​​the species extends in the western Atlantic from the Arctic to the Gulf of Mexico . In the Eastern Atlantic, the distribution area extends to the Iberian Peninsula and North Africa, and into the Mediterranean . The species is also found in the waters around the Azores .

It usually lives in somewhat deeper water from 54 m to 1385 m water depth, in the Aegean from 134 m to 755 m water depth.

Taxonomy

The species was founded in 1844 by Rudolph Amandus Philippi as Arca obliqua . However, the name is preoccupied by Arca obliqua Portlock, 1840. In 1848 the name was replaced by Pierre-Henri Nyst with Arca philippiana .

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. 22)
  • Guido Poppe and Yoshihiro Goto: European Seashells Volume 2 (Scaphopoda, Bivalvia, Cephalopoda) . 221 p., Verlag Christa Hemmen, Wiesbaden 1993 (2000 unc. Reprint), ISBN 3-925919-10-4 (p. 44)

On-line

Individual evidence

  1. ^ Wilhelm Kobelt: The genus Arca L. In illustrations after nature with descriptions. Systematic Conchylia Cabinet by Martini and Chemnitz, 8 (2): 1-238, Nürnberg 1891 Online at www.biodiversitylibrary.org (p. 38), plate 49 (as Arca (Bathyarca) Koreni Danielsson).
  2. ↑ Rudolph Amandus Philippi: Enumeratio molluscorum Siciliae cum viventium tum in tellure tertiara fossilium. 2nd edition: Eduard Anton, Halle, 1844 Online at www.biodiversitylibrary.org (p. 43) plate 15 (Fig. 2).
  3. ↑ a b MolluscaBase: Bathyarca philippiana (Nyst, 1848)
  4. ^ Pierre-Henri Nyst: Tableau synoptique et synonymique des espèces vivantes et fossiles de la familie des Arcacées. pt. 1 genre Arca. Mémoires de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique, 22: 1-79, Brussels 1848 Online at www.biodiversitylibrary.org (p. 53).

annotation

  1. ↑ Contrary to the information in MolluscaBase, Pierre-Henri Nyst did not note on p. 50 (here Arca obliqua Philippi) and p. 53 (here Arca philippiana ) that it was a substitute name.

Web links

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