Basterotiidae

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Basterotiidae
Basterotia oblonga, St. Helena (from EA Smith, 1894: Plate 22, Fig. 5.5a [1])

Basterotia oblonga , St. Helena (from EA Smith, 1894: Plate 22, Fig.5.5a)

Systematics
Subclass : Heterodonta
Euheterodonta
Superordinate : Imparidentia
Order :
Superfamily : Galeommatoidea
Family : Basterotiidae
Scientific name
Basterotiidae
Cossmann , 1909

The Basterotiidae are a shell - Family of Heterodonta .

features

The equally-folded to slightly uneven-folded, mostly small, mostly more or less inflated cases are a maximum of a few centimeters long. They are clearly unequal, the protruding vertebrae are always shifted towards the front end. The housings are oblique-rhomboidal, ovate-triangular or rounded; they gape at both ends. A weak keel emanating from the vortex and pulling towards the rear lower end of the housing separates the rear housing field from the rest of the housing. Another, but very weak, keel can pull from the vertebra to the lower front end of the housing.

The ligament is a narrow, short external ligament behind the vertebrae. It sits in the right flap on a nymph. There is only one main tooth in the lock, it can also be greatly reduced. The main tooth corresponds to a pit in the other valve. The surface line is entire or only slightly indented.

The shell is thick or thinner and slightly translucent. The surface shows rather coarser concentric growth stripes and somewhat irregular growth interruptions, the stripes parallel to the edge are often roughened or granular. The inner edge is also smooth. The periostracum is usually persistent even in adult specimens.

Geographical distribution, habitat and habitat

The species and genera of the family Basterotiidae are distributed worldwide.

The species of the genus Basterotia are commensals of hedgehog worms .

In 2013 Graham Oliver discovered that the genus Atopomya lives in symbiosis with bacteria. The bacteria live extracellularly on special cells in the gills (bacteriocytes).

Taxonomy

The taxon was established in 1909 by Maurice Cossmann . The family's eligibility, however, is controversial. While the MolluscaBase evaluates the taxon as a valid family name, Goto et al. (2011) transferred the genus Basterotia to the family Sportellidae. MolluscaBase represents the following genera and species in the family:

supporting documents

literature

  • Ryutaro Goto, Yoichi Hamamura, Makoto Kato: Morphological and Ecological Adaptation of Basterotia Bivalves (Galeommatoidea: Sportellidae) to Symbiotic Association with Burrowing Echiuran Worms. Zoological Science, 28 (3): 225-234, 2011. doi : 10.2108 / zsj.28.225
  • Ryutaro Goto, Atsushi Kawakita, Hiroshi Ishikawa, Yoichi Hamamura, Makoto Kato: Molecular phylogeny of the bivalve superfamily Galeommatoidea (Heterodonta, Veneroida) reveals dynamic evolution of symbiotic lifestyle and interphylum host switching. BMC Evolutionary Biology, 12: 172, 2012 doi : 10.1186 / 1471-2148-12-172

Individual evidence

  1. ^ Edgar Albert Smith: Report on the Marine Molluscan Fauna of the Island of St. Helena. Proceedings of the Zoological Society of London, 1890: 247-322, London 1890 Online at www.biodiversitylibrary.org (Plate 22, Fig.5,5a).
  2. ↑ P. Graham Oliver: Description of Atopomya dolobrata gen. Et sp. nov .: First record of bacterial symbiosis in the Saxicavellinae (Bivalvia). Journal of Conchology, 41 (3): 359-367, 2013 PDF
  3. ^ Maurice Cossmann, Albert Peyrot: Conchologie néogénique de L'Aquitaine. Actes de la Société linnéenne de Bordeaux, 63: 73-280, Bordeaux 1909 Online at www.biodiversitylibrary.org (p. 205)
  4. ↑ MolluscaBase: Saxicavella jeffreysi Winckworth, 1930