Stripe nut shell
| Stripe nut shell | ||||||||||||
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Nucula sulcata |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Nucula sulcata | ||||||||||||
| ( Bronn , 1831) |
The strip Nut Shell ( Nucula sulcata ) is a shell - type from the family of nuculidae (Nuculidae).
features
The evenly folded, moderately inflated housing is triangular-ovoid in outline; the maximum length is 20 millimeters. It is longer than it is tall, about four-fifths of its length in height. The vertebra is behind the center at about a third to a quarter of the rear end. The anterior, moderately arched dorsal margin is long and sloping flat. The posterior dorsal margin, on the other hand, is almost straight and slopes steeply. The transition from the posterior dorsal margin to the ventral margin is angled. The transition from the anterior dorsal margin to the ventral margin, on the other hand, is moderately rounded. The ventral margin is also well rounded, stronger than the anterior dorsal margin.
The taxodontic lock consists of a wide lock plate with long, pointed teeth. It is bent at an angle and therefore has a front and a rear part. In the front part there are 24 to 29 teeth, in the back part 12 to 14 teeth. The internal, elongated ligament is opisthodetic and sits in a well-formed, elongated triangular resilifer . A cone-shaped tooth or tooth lies directly behind the resilifer. Another, externally located, thin and barely visible ligament sits in front of the vertebra. The lunula is long and lanceolate with only indistinct edges. It is barely raised, slightly convex and has transverse wrinkles. The area is elongated, heart-shaped with margins that are not very distinct.
The ornamentation consists of numerous, closely spaced and very fine raised, radial lines. They intersect with clear and somewhat coarser, closely spaced, concentric, raised lines and form a fine grid pattern. The inner edge of the housing is thus finely serrated, the serration corresponds to the radial raised lines. The periostracum is comparatively thick with a matt surface. The color varies from gray-green, olive green to dark brown and almost black. The housings are often covered with a crust of manganese compounds or hardened mud, especially in the rear part and / or dorsal part of the housing. The shell is quite thick and firm for a species of the genus Nucula . It is whitish, with a pearly sheen inside . The vertebrae are often corroded.
The surface line is entire and has no indentation. There are two approximately equally large, egg-shaped sphincters that leave only indistinct marks on the inside of the case.
Similar species
It is the largest of the nucula species found in the eastern Atlantic . The shell is remarkably thick with a dull periostracum.
Geographical distribution and habitat
The distribution area extends along the eastern Atlantic from northern Norway to Angola . It also penetrates the North Sea and the Mediterranean .
Nucula sulcata occurs from shallow water (about nine meters water depth) to about 400 meters (a find up to 2,250 m) water depth on muddy sandy soils.
Taxonomy
The taxon was published in 1831 by Heinrich Georg Bronn in his work Italy's Tertiary Formations and Their Organic Inclusions . A word-for-word description can be found in the second volume of his work, Results of My Natural History-Economic Travel (in Italy) , which appeared in 1832 . Remarkably, it has only been used in this combination since then. But there are a number of younger synonyms :
- Nucula compta Gould, 1834
- Nucula decussata GB Sowerby I, 1833
- Nucula polii Philippi, 1836
- Nucula rugosa Ponzi, 1872
- Nucula triquetra Ponzi, 1872
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. 4)
- 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. 37)
On-line
- Marine Species Identification Portal: Nucula sulcata Bronn, 1831
- Marine Bivalve Shells of the British Isles: Nucula sulcata Bronn, 1831 (site of the National Museum Wales, Department of Natural Sciences, Cardiff)
Individual evidence
- ^ Theodor CH Cole: Dictionary of Invertebrates / Dictionary of Invertebrates: Latin-German-English. Springer Spektrum, Berlin 2017, ISBN 978-3-662-52869-3 , p. 59. Preview on Google Books
- ^ Heinrich Georg Bronn: Italy's tertiary structures and their organic inclusions. 176 pp., Heidelberg, Groos, 1831. Online at www.biodiversitylibrary.org (p. 109/10).
- ^ Heinrich Georg Bronn: Results of my natural-historical-economic trips. II. 686 p., Heidelberg & Leipzig, Akademische Buchhandlung Karl Groos, 1832 Online at SLUB Dresden (p. 617/8).
- ^ World Register of Marine Species: Nucula sulcata Bronn , 1831
