Delectopecten vitreus

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Delectopecten vitreus
Delectopecten vitreus

Delectopecten vitreus

Systematics
Order : Pectinida
Superfamily : Pectinoidea
Family : Scallops (Pectinidae)
Subfamily : Camponectinae
Genre : Delectopects
Type : Delectopecten vitreus
Scientific name
Delectopecten vitreus
( Gmelin , 1791)

Delectopecten vitreus is a type of mussel from the scallop family(Pectinidae).

features

The almost equally hinged housing is up to 25 millimeters in size. The somewhat unequal-sided flaps are approximately rounded to oblique-egg-shaped in outline, with the front end being slightly more rounded than the rear end. The two valves are only moderately arched, and usually a little higher than wide (long). Fritz Nordsieck gives the following dimensions: 18 mm long, 19 mm high and 6 mm thick. He gives the dimensions of the subspecies chaperi as 17 mm in length, 18.5 mm in height and 8 mm in thickness. The umbonal angle is approx. 110 °. The front ears are comparatively large and have a deep byssus slit and a ctenolium . The upper part of the front ear has three to five radial lines or folds, the front end is convexly rounded, the inner end of the byssus slit is concavely rounded. The rear ears are much smaller and hardly separated from the actual case body. The dorsal edge and the rear edge form an obtuse angle (approx. 120 °), the rear edge merges into the rear edge of the housing body without any noticeable interruption.

The gray-white skin is thin, fragile and translucent (hyaline). The ornamentation consists of very fine radial applied lines that intersect with very fine growth strips at slightly different distances. Radial lines and growth stripes become a little clearer towards the edge. The crossing points are developed into small warts or fine thorns. The intensity of the radial lines and growth strips is variable; there are also almost smooth specimens. However, it is still visible here that the fine warts and spines were probably lost during the animal's lifetime.

Similar species

Delectopecten alcocki from the Indian Ocean is very similar. The species lacks the reinforcement of the ornamentation towards the edge of the case. Delectopecten musorstomi Poutiers, 1981 from the Philippines and Indonesia

Geographical distribution, habitat and way of life

The distribution area extends from the Arctic Ocean ( Greenland , Northern Norway , Arctic Canada ) to the coasts of North Africa and Namibia . It also occurs in the Mediterranean Sea , the waters around the Canary Islands and the Azores . According to Dijkstra and Goud, it even occurs as far as Tierra del Fuego and the Antarctic . Poppe and Goto even refer to it as a cosmopolitan species.

The animals often live with byssus attached to a hard ground between deep water corals on the shelf edge or on the shelf slope down to the deep sea. They rarely occur in shallower water. The depth distribution is by Fritz Nordsieck with 37 meters water depth to 3,125 meters water depth. Dijkstra and Goud name 70 m to 4,255 m. It is part of the Lophelia pertusa deep water coral community in the North Atlantic . Here the specimens are often attacked by the parasitic-predatory foraminifera Hyrrokkin sarcophaga .

Taxonomy

The taxon was set up by Johann Friedrich Gmelin in 1791 as Ostrea vitrea . However, he did not give a picture, but referred to three eyepieces shown in 1784 by Johann Hieronymus Chemnitz on plate 67 (Fig. 637a, b, a), which are thus syntypes of the species. The taxon is now generally accepted as belonging to the genus Delectopecten Stewart, 1930. The MolluscaBase names a number of synonyms : Chlamys abyssorum (M. Sars, 1868), Chlamys chaperi Dautzenberg & Fischer, 1897, Chlamys papyracea Röding, 1798, Pseudamussium gelatinosum Mabille & Rochebrune, 1889, Pecten vitreus var. Albida Locard, 1888, Pecten vitreus var. Denudata Locard, 1898, Pecten vitreus var. Elongata Locard, 1898, Pecten vitreus var. Inflata Locard, 1898, Pecten vitreus var. Lavigata Lovén, 1846, Pecten vitreus var. Minor Locard, 1888 and Pecten vitreus var. Sublaevigata Locard, 1888.

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. 46)
  • Guido T. Poppe and Y. Goto: European Seashells. Vol II (Scaphopoda, Bivalvia, Cephalopoda). 221 pp., Verlag Christa Hemmen, Wiesbaden, 1993 ISBN 3-925919-11-2 , p. 65.

On-line

Individual evidence

  1. ↑ Jean Maurice Poutiers: Mollusks: Bivalves. Results of the Campahnes MUSORSTOM. I Philippines (18-28 Mars 1976), pp. 325-356, 1981 PDF
  2. ↑ a b Henk H. Dijkstra, Joroen Goud: Pectinoidea (Bivalvia, Propeamussiidae & Pectinidae) collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern region of the North Atlantic Ocean. Basteria, 66: 31-82, 2002.
  3. ↑ Tomas Cedhagen: Taxonomy and Biology of Hyrrokkin sarcophaga gen. Et sp. n., a parasitic foraminiferan (Rosalinidae). Sarsia, 79: 65-82, Bergen 1994.
  4. ^ Johann Friedrich Gmelin: Caroli a Linné, systema naturae. Tom. I. Pars VI. Pp. 3021–3910, Beer, Lipsiae / Leipzig 1791 Online at www.biodiversitylibrary.org (p. 3328)
  5. ↑ Johann Hieronymus Chemnitz: New systematic Conchylien-Cabinet . 7th Volume, 356 pp., Pl. 37–69, Raspische Buchhandlung, Nuremberg 1784. Online at www.biodiversitylibrary.org (here called glass coat ) Pl. 67
  6. ↑ a b MolluscaBase: Delectopecten vitreus (Gmelin, 1791)

Web links

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