Ennucula

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Ennucula
Ennucula obliqua

Ennucula obliqua

Systematics
Subclass : Protobranchia
Order : Nuculida
Superfamily : Nuculoidea
Family : Nut clams (Nuculidae)
Subfamily : Nuculinae
Genre : Ennucula
Scientific name
Ennucula
Iredale , 1931

Ennucula is a clam genus of the family of nuculidae (Nuculidae) in the order of Nuculida .

features

The same-hinged housing is unequal, the rear housing part is more or less significantly shorter than the front housing part, i. H. the vortex is behind the center. The housings are approximately triangular to broadly ovoid in outline, i. H. usually a little longer than high, and more or less bloated. They are only a few millimeters to a few centimeters in size in the adult stage.

The lock is taxodontic and divided by the internal ligament into a front and a rear part, which are at an angle of approximately 90 ° to each other. The front part always has more teeth than the rear part, often up to twice as many teeth. The ligament is usually large and sits in a well-developed resilifer . The resilifer is askew.

The surface is almost smooth, only with a concentric growth line and rarely also a fine grain. The inner edge of the two flaps is not serrated. The two sphincters are approximately the same size, usually round, egg-shaped or slightly elongated. The surface line is not indented.

Geographical distribution and habitat

The genus Ennucula occurs in all seas. The species live on sandy, fine sandy and muddy soils from the shallow subtidal to greater depths.

Taxonomy

The taxon was established in 1931 by Tom Iredale ; Type species is Nucula obliqua Lamarck, 1819.

The genus was previously mostly treated as a synonym by Nucula Lamarck, 1799 or Leionucula Quenstedt, 1930. The World Register of Marine Species accepts the taxon as a valid genus and adds the following species:

supporting documents

literature

  • Raymond C. Moore : Treatise on Invertebrate Paleontology. Part N: Mollusca. 6, Bivalvia. Vol. 2. The University of Kansas et al., Boulder CO 1969 (S.N230 / 1 as)
  • 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)

Individual evidence

  1. ↑ Tom Iredale : Australian molluscan notes. No. 1. Records of the Australian Museum, 18 (4): 201-235, Sydney 1931 PDF (p. 202)
  2. ↑ Jean-Baptiste de Lamarck : Prodrome d'une nouvelle classification des coquilles, comprenant une rédaction appropriée des caractères génériques, et l'établissement d'un grand nombre de genres nouveaux. Mémoires de la Société d'Histoire Naturelle de Paris, 1: 63-91, Paris, 1799 Online at www.biodiversitylibrary.org (p. 87).
  3. ↑ Werner Quenstedt : The adaptation to the burrowing way of life in the history of the Solenomyids and Nuculaceae. Geological and palaeontological treatises, New Series, 18 (1): 1-119, Jena 1930.
  4. ^ World Register of Marine Species: Nucula Lamarck, 1799

Web links

Commons : Ennucula  - collection of images, videos and audio files