Thyasiridae

Thyasiridae
Common scallop ( Thyasira flexuosa )
Systematics
Subclass : Heterodonta Euheterodonta Superordinate : Imparidentia Order : Lucinoida Superfamily : Thyasiroid Family : Thyasiridae
Scientific name
Thyasiridae
Dall , 1900

The Thyasiridae are a shell - Family from the order of Lucinoida in the subclass Heterodonta . Many species in the family live in symbiosis with chemoautotrophic bacteria in the gills. About 130 species are currently known.

features

The same-flattened, inflated or even very flat housings are usually small (a few millimeters to centimeters), and round, ovoid, oblique-ovoid, rounded-rhomboidal or also rounded-polygonal in outline. They can be taller than wide or significantly longer than high. They are equilateral or approximately equilateral to clearly unequal, the vertebrae sit in front of the midline. The ligament is usually narrow. In the lock, teeth are usually only indicated, often the lock is also toothless. The coat is not indented. There are two sphincters.

The shell is usually thin, often translucent or transparent. There are only concentric growth strips.

Geographical distribution, habitat and way of life

The family is spread around the world. The species live in deeper water on or in soft, oxygen-poor and sulfide-rich soils.

The animals create a tube in the sediment that is roughly the length of the housing. This is attached inside with slime; the mucus is formed by the glands on the foot. The tube is not only used for protection and living, but is also used as an inflow opening for breathing water and z. T. also used for food. The foot is used for digging and is very flexible. It can be extended up to ten times the length of the housing.

Taxonomy

Maorithyas hadalis

Spinaxinus sentosus

The taxon was established by William Healey Dall in 1900. Currently (2016) the following genera are included in the family:

• • Adontorhina Berry, 1947
  • Ascetoaxinus Oliver & Frey, 2014
  • Axinodon Verrill & Bush, 1898
  • Axinopsida Keen & Chavan in Chavan, 1951
  • Axinulus Verrill & Bush, 1898
  • Axinus J. Sowerby, 1821
  • Channelaxinus Valentich-Scott & Coan, 2012
  • Conchocele Gabb, 1866
  • Genaxinus Iredale, 1930
  • Leptaxinus Verrill & Bush, 1898
  • Maorithyas CA Fleming, 1950
  • Mendicula Iredale, 1924
  • Ochetoctena Oliver, 2014
  • Odontogena Cowan, 1964
  • Parathyasira Iredale, 1930
  • Prothyasira Iredale, 1930
  • Spinaxinus Oliver & Holmes, 2006
  • Tauraxinus Sacco, 1901
  • Thyasira Lamarck, 1818
    • Common scallop shell ( Thyasira flexuosa (Montagu, 1803))
  • † Wallerconcha Valentich-Scott & CL Powell, 2014

supporting documents

literature

• Suzanne C. Dufour: Gill Anatomy and the Evolution of Symbiosis in the Bivalve Family Thyasiridae. Biological Bulletin, 208 (3): 200-212, 2005 URL
• Rudolf Kilias: Lexicon marine mussels and snails. 2nd edition, 340 p., Verlag Eugen Ulmer, Stuttgart 1997 ISBN 3-8001-7332-8 (p. 308)
• Raymond Cecil Moore (Ed.): Treatise on invertebrate paleontology. Part N. Mollusca, 6, Bivalvia 2. XXXVIII, S.N490-N951., New York, 1969 (S.N608).

Individual evidence

1. ↑ ^{a b} MolluscaBase: Thyasiridae Dall, 1900 (1895)
2. ^ William Healey Dall: Contributions to the Tertiary Fauna of Florida, with especial reference to the Miocene silex-beds of Tampa and the Pliocene beds of the Caloosahatchie River. Part 5, Teleodesmacea: Solen to Diplodonta. Transactions of the Wagner Free Institute of Philadelphia, 3 (5): 949-1218, Philadelphia 1900 Online at www.biodiversitylibrary.org (p. 1116)

Web links

Commons : Thyasiridae  - Collection of images, videos and audio files