Pomatias

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Pomatias
Beautiful land snail (Pomatias elegans)

Beautiful land snail ( Pomatias elegans )

Systematics
Superordinate : Caenogastropoda
Order : Sorbeoconcha
Subordination : Hypsogastropoda
Superfamily : Littorinoidea
Family : Land snails (Pomatiidae)
Genre : Pomatias
Scientific name
Pomatias
Studer in Coxe , 1789

Pomatias is a genus of land-dwelling snails from the family of terrestrial snails (Pomatiidae) in the order of Sorbeoconcha . The oldest representatives of the genus come from the Oligocene .

features

The conical-shaped cases of the representatives of the genus Pomatias are up to 25 mm high and 17 mm wide. The males are usually smaller on average, the housings are somewhat slimmer and have a narrower mouth. The ratio of height to width is slightly different for the species in the genus. They have 4 to 6 strongly curved turns, which are separated from each other by a deep seam, and a rather pointed housing apex . Usually the spiral lines are very clear and strong, the slightly oblique radial lines can also be very strong and form a reticulate pattern with the spiral lines. The radial lines can, however, also be significantly weaker than the spiral lines. The mouth is rounded to obliquely egg-shaped with a more or less angled upper end. The mouth rim is only slightly enlarged, simple and not thickened. The end turn is rounded at the bottom and has a narrow bifurcation.

The casings are mostly yellowish brown to reddish brown, often with a white flame pattern. The essentially flat operculum is calcified, has a few narrower inner turns and a large end turn, and a slight point or corner that fits into the angled upper end of the case mouth. The nucleus of the operculum is slightly eccentric to the edge of the spindle.

The animal is relatively large, the soft body gray-brownish with long tentacles. The animals are of separate sex.

Geographical distribution

The species mainly occur in the wider area of ​​the Mediterranean area. In the north the distribution area extends to southern England, southern Ireland and Denmark. In Central Europe, the occurrences are very dispersed and limited to a few heat-favored areas. In the east it extends to the northern Caucasus, in the south to North Africa. Another occurrence is in the Canary Islands.

Taxonomy

The taxon was validly proposed by Samuel Emanuel Studer in William Coxe in 1789 . The name is derived from the ancient Greek ὁ πωματίας, which is interpreted as "a snail that closes its little house with a lid in winter". Pomatias Studer in Coxe, 1789 is the type genus of the family Pomatiidae / Pomatiasidae. The strain is pomati-, therefore the correct family name is Pomatiidae. The generic name was used for a long time in the sense of Hartmann, 1821. This taxon is a synonym of Cochlostoma Jan, 1830. It was not until Wilhelm Kobelt restricted the term to the original species, or rather separated the other species into the genus Cochlostoma . At present nine to ten recent and around 25 extinct species have been described. Russian authors divide the genus into two sub-genera, Pomatias (Pomatias) and Pomatias (Eichwaldipoma) Starobogatov & Anistratenko, 1991:

The type species of the genus Pomatias Studer in Coxe, 1789 is the beautiful land snail ( Pomatias elegans ).

literature

  • Wilhelm Wenz: Gastropoda extramarina tertiaria. In: Carl Diener (Ed.), Fossilium catalogus, 1 Animalium , 17, 18, 20-23: 1-1862, Berlin 1923 Online at www.biodiversitylibrary.org (pp. 1793ff.).
  • Wilhelm Wenz: Gastropoda. Part I: General Part and Prosobranchia. In: Handbuch der Paläozoologie Volume 6, 948 p., Berlin, Verlag von Gebrüder Borntraeger, 1938 (p. 535)

Individual evidence

  1. ^ William Coxe: Travels in Switzerland, in a series of letters to William Melmoth, Esq. In three volumes. Vol. III. SI-VIII, pp. 1-446, London, Cadell Online at GDZ (p. 388)
  2. ^ Wilhelm Pape: Concise dictionary of the Greek language. Braunschweig 1914, Volume 2, p. 827.
  3. ^ Wilhelm Kobelt: The animal kingdom. A compilation and identification of the recent animal forms. 16. Delivery. Mollusca. Cyclophoridae. SI-XXXIX, p. 1-662, Berlin, Friedländer 1902 Online at www.biodiversitylibrary.org (p. 488)
  4. ^ A b Yuri I. Kantor, Anatoly Schileyko, Maxim V. Vinarski, Alexander V. Sysoev: Catalog of the Continental Mollusks of Russia and Adjacent Territories. Version 1.0, February 15, 2009, PDF
  5. ↑ A. Papp, Erich Thenius: Vösendorf - a life picture from the Pannon of the Vienna basin. A contribution to the geology and paleontology of the sub-Pliocene Congerian layers of the southern Vienna Basin. Announcements of the geological society in Vienna, 46: 1-109, 15 tables Vienna, 1953 PDF (p. 23 below)
  6. Jump up ↑ Ewa Stworzewicz: Miocene land snails from Bełchatów (Central Poland), I. Cyclophoridae, Pomatiasidae (Gastropoda, Prosobranchia). Paläontologische Zeitschrift, 69 (1/2): 19-30, Stuttgart 1995.
  7. ^ Mathias Neubauer, Thomas A. Neubauer: Opole (Poland) - a ley locality for middle Miocene terrestrial mollusc faunas. Bulletin of Geosciences 93 (1): 71-146, 2018 doi : 10.3140 / bull.geosci.1692