Bathyarca pectunculoides

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Bathyarca pectunculoides
Bathyarca pectunculoides (from Kobelt, 1891: Plate 5, Fig.6,7 [1])

Bathyarca pectunculoides (from Kobelt, 1891: Plate 5, Fig. 6.7)

Systematics
Order : Arcida
Superfamily : Arcoidea
Family : Ark clams (Arcidae)
Subfamily : Bathyarcinae
Genre : Bathyarca
Type : Bathyarca pectunculoides
Scientific name
Bathyarca pectunculoides
( Scacchi , 1835)

Bathyarca pectunculoides is a mussel species from the family of ark mussels (Arcidae) in the order Arcida .

features

The slightly unevenly folded, moderately inflated housing is rounded and wedge-shaped in outline. The left flap is slightly larger than the right flap, which sits in the left flap. The length of the adult housing is up to about seven millimeters. The case is only slightly longer than it is high (L / H index = 1.3), and the rear part of the case is slightly longer and significantly higher than the front part of the case. The strong vertebra sits almost in the middle of the total dorsal length, only slightly in front of the midline. The dorsal margin is long and straight, the dorsal field (viewed from above) is narrow. The rear edge is broadly rounded and merges into the broadly rounded ventral edge, in some specimens it is truncated slightly at an angle. The front edge is rounded flat and initially merges into the straight front ventral edge. There is a recess for the byssus here .

The duplivincular ligament behind the vertebra has a diamond shape. The lock is taxodont, the lock plate is slightly curved. There are five teeth each in the front and back. The rear teeth are arranged almost parallel to the dorsal margin, the front teeth are inclined to the dorsal margin. There are two sphincters; the anterior sphincter is slightly smaller than the posterior sphincter.

The whitish skin is thin, translucent but still firm. The ornamentation consists of growth strips parallel to the edge and fine and dense radial ribs, which are somewhat stronger than the ornamentation parallel to the edge. The ornamentation is much more developed on the smaller right flap than on the larger left flap. The inner edge of the housing of the left flap is weakly serrated up to a pit parallel to the edge near the edge. The edge of the right flap is smooth. The light straw-colored periostracum is drawn out into dense, short hairs between the fine ribs. At the rear end, the edge of the jacket is extended to form lobes, which act as simple siphons for incoming and outgoing water. The gills are comparatively large, while the mouth lobes are small.

Geographical distribution, way of life and habitat

Bathyarca pectunculoides occurs in the Arctic Ocean , in the North and Southwest Atlantic and in the Mediterranean . It lives there at a depth of 40 to 3,310 meters.

Bathyarca pectunculoides is a suspension filter of the deeper water attached with byssus threads.

Taxonomy

The taxon was established in 1835 by Arcangelo Scacchi as Arca pectunculoides . The holotype is a fossil from the Pliocene . Bathyarca pectunculoides (Scacchi, 1835) is the type species of the genus Bathyarca Kobelt, 1891. The MolluscaBase lists the following synonyms on: Arca crenulata Verrill, 1882, Arca koreni Danielssen, 1859, Arca pectunculiformis Locard, 1886, Arca pectunculoides var. Major Friele, 1878 , Arca pectunculoides var. septentrionalis GO Sars, 1878, Arca Verrilli Lamy, in 1907 and Bathyarca pectunculoides var. pellucida Oliver & Allen 1980.

Fritz Nordsieck understood the species much broader and included Bathyarca orbiculata (Dall, 1886) and Arca raridentata S. Wood, 1848.

supporting documents

literature

  • Brian Morton: Functional morphology of Bathyarca pectunculoides (Bivalvia: Arcacea) from a deep Norwegian fjord with a discussion of the mantle margin in the Arcoida. Sarsia, 67 (4): 269-282, 1982 doi : 10.1080 / 00364827.1982.10421341
  • 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)

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, Nuremberg 1891 Online at www.biodiversitylibrary.org , plate 5 , plate 49 .
  2. ^ Arcangelo Scacchi: Note intorno alle conchiglie ed a 'Zoofiti fossili che si trovano delle Vicinanze di Cravina in Puglia. Annali Civili del Regno delle Due Sicilie, 6 :. 75-84, Naples 1834, 82. Online at Google Books (p. 82)
  3. ↑ a b MolluscaBase: Bathyarca pectunculoides (Scacchi, 1835)

Web links

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