Drill shells

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Drill shells
White borer mussel (Barnea candida)

White borer mussel ( Barnea candida )

Systematics
Subclass : Heterodonta
Euheterodonta
Superordinate : Imparidentia
Order : Myida
Superfamily : Pholadoidea
Family : Drill shells
Scientific name
Pholadidae
Lamarck , 1809

The lithophagous molluscs (Pholadidae), and True lithophagous molluscs called, are a mussel Family from the order of Myida . The family has been known since the Bajocium (Middle Jurassic).

features

The housings are equally hinged and greatly elongated, mostly gaping at the front and back. Often, secondary shell formations (protoplax, mesoplax, metaplax and siphonoplax) appear in addition to the two valves of the housing. The front end is often elongated like a beak, the front dorsal margin is turned over.

The ligament lies internally under the vertebrae on a chondrophore , it can also be reduced. The lock is toothless. The two sphincters are unequal in size. The posterior sphincter is large and is close to the ventral margin. The smaller, anterior sphincter muscle lies on the anterior, folded dorsal margin. The jacket is deeply indented, the jacket bay extends approximately into the middle of the housing. The edge of the mantle is largely fused ventrally. There are openings for the foot and the long siphons . The foot is short without linen. The end of the siphons can be closed with lime plates (pallets).

The shell is aragonitic with a variable microstructure, usually with an outer prism layer, a middle cross-lamellar layer and an inner complex-cross-lamellar or homogeneous layer. The ornamentation in the front part of the case consists of strong radial ribs or sinusoidally curved ribs parallel to the edge, which can be reinforced with thorns or spikes. The rear end is only weakly ornamented.

Geographical distribution and way of life

The family is spread around the world. They live boring in semi-solid or solid sediments.

Taxonomy

The taxon was introduced by Jean-Baptiste de Lamarck as Les pholadaires . Since the name was ascribed to Lamarck in the later Latinization, Lamarck is also considered the author of the taxon, not the author who was the first to Latinize the taxon. MolluscaBase assigns the following genera to the family in three subfamilies:

supporting documents

literature

  • Michael Amler, Rudolf Fischer & Nicole Rogalla: Mussels . Haeckel library, volume 5. Enke Verlag, Stuttgart 2000 ISBN 3-13-118391-8 .
  • S. Peter Dance, Rudo von Cosel (arrangement of the German edition): The great book of sea shells. 304 p., Verlag Eugen Ulmer, Stuttgart, 1977 ISBN 3-8001-7000-0 (p. 272)
  • Fritz Gosselck, Alexander Darr, Jürgen HJ Jungbluth, Michael Zettler: common names for mollusks of the sea and brackish water in Germany. Mollusca, 27 (1): 3-32, 2009 PDF (p. 29)
  • Rudolf Kilias: Lexicon marine mussels and snails. 2nd edition, 340 pages, Verlag Eugen Ulmer, Stuttgart 1997 ISBN 3-8001-7332-8 (p. 248/9)
  • Raymond Cecil Moore (Ed.): Treatise on invertebrate paleontology. Mollusca, 6, Part N, Bivalvia 2. XXXVIII S., S.N491-951, New York, 1969 (S.N706).
  • 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. 151/2)
  • 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. 131)

Individual evidence

  1. ↑ Yasuo Kondo, Shin-ichi Sano: Origination of extant heteroconch families: Ecological and environmental patterns in post-Paleozoic bivalve diversification. Palaeontological Research, 13: 39-44, Tokyo 2009 doi : 10.2517 / 1342-8144-13.1.039
  2. ^ Jean-Baptiste de Lamarck: Philosophy zoologique. Vol. 1, XXV + 428 S., Dentu, Paris, 1809 Online at Google Books (p. 319).
  3. ↑ MolluscaBase: Pholadidae Lamarck, 1809

Web links

Commons : Boring Clams (Pholadidae)  - Collection of images, videos and audio files