Geukensia

from Wikipedia, the free encyclopedia
Geukensia
Geukensia demissa

Geukensia demissa

Systematics
Subclass : Pteriomorphia
Order : Mytilida
Superfamily : Mytiloidea
Family : Blue mussels (Mytilidae)
Subfamily : Brachidontinae
Genre : Geukensia
Scientific name
Geukensia
Van den Poel , 1959
inside

Geukensia is agenus of mussels from the mussel family( Mytilidae ).

features

The housing is elongated with an angled dorsal edge and a concave curved ventral edge. The greatest height is in the rear third of the case. The cases are up to 13 centimeters long. The vertebrae are broadly rounded and sit behind the front end. The rear part of the case in particular is covered with strong, tightly spaced radial ribs, which give the case edge a finely indented appearance.

Geographical distribution and habitat

The two species of the genus Geukensia were originally native to the east coast of North America and Central America. Geukensia demissa occurs from Nova Scotia (Canada) to Florida (in the south of the USA), Geukensia granosissima from Florida southwards to the Caribbean and the Gulf of Mexico . Geukensia demissa was brought to the west coast of North America ( San Francisco Bay , California) at the beginning of the 20th century . It has since been abducted to other coastal areas in the Gulf of Mexico and the Caribbean.

The two species occur on muddy soils, salt marshes and in oyster beds in the intertidal zone and in the shallow subtidal . They prefer slightly brackish water.

Taxonomy

The taxon Geukensia was proposed by Van de Poel in 1959. However, it is not a substitute name for Arcuatula Soot-Ryen, as indicated in 1955 in the World Register of Marine Species, but a new genus. Tron Soot-Ryen had not proposed a new genus called Arcuatula , but rather misinterpreted the genus Arcuatula Jousseume in Lamy, 1919. The type species is Mytilus demissus Dillwyn, 1817. Two species are currently assigned to the genus Geukensia :

The latter species was also considered a synonym or subspecies of Geukensia demissa in the past . Clear genetic differences, differences in housing morphology and the preservation of genetic identity in areas where both forms occur together speak in favor of a separation at the species level.

supporting documents

literature

  • Tron Soot-Ryen: A report on the family Mytilidae. Allan Hancock Pacific Expedition, 20 (1): 1-70, 1955 Online at UCS Digital Library .
  • Tron Soot-Ryen: Some nomenclatural changes in the family Mytilidae. Proceedings of the Malacological Society of London, 35: 127-128, London 1963.

Individual evidence

  1. ↑ Van den Poel, L .: Faune malacologique du Hervien. Troisième note. Bulletin Institut Royal des Sciences Naturelles de Belgique, 35 (15): 1-26, 1959.
  2. ^ A b S. K. Sarver, MC Landrum, DW Foltz: Genetics and taxonomy of ribbed mussels (Geukensia spp.). Marine Biology, 113: 385-390, 1992.
  3. ↑ World Register of Marine Species: Geukensia Van den Poel, 1959

Web links

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