Lasaeidae

Lasaeidae
Hemilepton nitidum (from Forbes & Hanley 1853: Plate 36, Fig. 3,4)
Systematics
Subclass : Heterodonta Euheterodonta Superordinate : Imparidentia Order : Superfamily : Galeommatoidea Family : Lasaeidae
Scientific name
Lasaeidae
JE Gray , 1842

The Lasaeidae are a shell - family from the superiority of the Imparidentia . The oldest members of the family come from deposits of chalk .

features

The housings are equally hinged and usually only moderately uneven. The vertebrae are slightly behind or slightly in front of the midline. They are small to slightly protruding and can be rolled up to the front or back. The housings are rounded in outline, square, egg-shaped or also rounded triangular, occasionally also a little crooked. They are only a few millimeters in size (rarely up to 12 mm). The ligament is internal. The lock has only a few teeth, mostly main and posterior teeth. The sphincter muscles are about the same size, the surface line is not indented.

The shells are thin, translucent and fragile. The surface is usually smooth or shows only strips of growth. Rarely occur on radial ribs or stripes or thicker ridges parallel to the edge. The periostracum is a thin coating.

Geographical distribution, habitat and way of life

The representatives of the Lasaeidae are distributed worldwide from shallow water to deeper areas. They live as commensals or as parasites on larger animals (crabs, echinoderms, annelids, ascidia, etc.). You can move quickly with your foot.

Taxonomy

The taxon was set up in 1842 by John Edward Gray as Lasiadae. MolluscaBase represents the Leptonidae Gray, which many authors still regard as an independent family, in 1847 as a synonym for the Lasaeidae. A younger synonym is also Erycinidae Deshayes, 1850, also a younger homonym of Erycinidae Swainson, 1827, which is based on Erycina Fabricius, 1807 (Lepidoptera).

• Family Lasaeidae JE Gray, 1842
  • Aligena HC Lea, 1843
  • Amerycina Chavan, 1969
  • Arculus Monterosato, 1909
  • Arthritica Finlay, 1926
  • Boreacola FR Bernard, 1979
  • Borniola Iredale, 1924
  • Ceratobornia Dall, 1899
  • Diarmaidia Valentich-Scott, 2012
  • Erycina Lamarck, 1805
  • Hemilepton Cossmann & Peyrot, 1911
    • Roundish suitcase shell ( Hemilepton nitidum (Turton, 1823))
  • Hitia Dall, Bartsch & Rehder, 1938
  • Isorobitella Keen, 1962
  • Lasaea Brown, 1827
    • Lasaea adansoni (Gmelin, 1791)
  • Lepton Turton, 1822
    • Transparent trunk shell ( Lepton squamosum (Montagu, 1803))
  • Lozouetia Cosel, 1995
  • Melliteryx Iredale, 1924
  • Myllita d'Orbigny & Récluz, 1850
  • Neaeromya Gabb, 1873
  • Orobitella Dall, 1900
  • Parabornia Boss, 1965
  • Paraborniola Habe, 1958
  • Platomysia Habe, 1951
  • Pristes Carpenter, 1864
  • Pythinella Dall, 1899
  • Rhamphidonta FR Bernard, 1975
  • Salpocola Lützen, Kosuge & Jespersen, 2008
  • Scacchia Philippi, 1844
  • Semeloidea Bartrum & Powell, 1928 †

supporting documents

literature

• Eugene V. Coan, Paul Valentich-Scott: Bivalve Seashells of Tropical West America marine Bivalve mollusks from Baja california to Northern Perú. Part 1,598 pp., Santa Barbara Museum of Natural History, Santa Barbara 2012 ISBN 978-0-936494-43-2 (p. 493)
• Peter J. Hayward, John S. Ryland: Handbook of the Marine Fauna of North-West Europe. X + 800 S., University Press, Oxford 2017 ISBN 978-0-19-954944-3 (p. 569)

Individual evidence

1. ^ John Edward Gray: Synopsis of the contents of the British Museum , Only bei GoogleBooks (pp. 79, 91)
2. ↑ MolluscaBase: Lasaeidae Gray, 1842

Web links

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