Ribbed point screw

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Ribbed point screw
Ribbed point snail (Paralaoma servilis)

Ribbed point snail ( Paralaoma servilis )

Systematics
Subordination : Land snails (Stylommatophora)
Superfamily : Punctoidea
Family : Punctidae (Punctidae)
Subfamily : Laominae
Genre : Paralaoma
Type : Ribbed point screw
Scientific name
Paralaoma servilis
( Shuttleworth , 1852)

The ribbed point snail ( Paralaoma servilis ) is a species of snail in the family of point snails (Punctidae) from the suborder of land snails (Stylommatophora).

features

The right-hand wound, very small case is very low-conical. It measures only 1.5 to 2 mm in width and 1 mm in height. In the adult stage the casing has 3½ turns. The turns increase rapidly and are well arched on the periphery. The last turn is weakly shouldered; a weak keel is indicated on the periphery. The mouth is slightly oblique to the axis of the winding, is round and only slightly indented due to the previous winding. The edge of the mouth is thin, straight and only slightly bent in the navel area. The navel is large and wide open; it takes up about a quarter to a fifth of the case width.

The housing is yellowish brown. The surface shows very fine, regularly laid out growth strips at wide intervals. A fine spiral stripe can only be seen under higher magnification.

Similar species

The whorls widen slightly more in Paralaoma servilis than in the point snail ( Punctum pygmaeum ). Gittenbergia sororcula is larger at 3½ turns, the point snail is significantly smaller.

Distribution of the species in Europe and Western Turkey

Geographical distribution and habitat

The species is distributed worldwide through anthropogenic displacement. The original distribution area is not exactly known. Since the other species of the genus Paralaoma occur in Australia, New Zealand and some South Pacific islands, it is speculated that this was also the original range of the finned point snail. However, there are also suspicions that the species was found in prehistoric times in the Mediterranean, i.e. H. had a larger original range. Newer records in remote areas through anthropogenic displacement are Easter Island , Hawaii, Colombia and Argentina.

The occurrences in Germany are concentrated in gardens and parks, mainly in southwest Germany. The species was probably introduced with plants from the Mediterranean region.

The animals live in the litter in damp, shady locations in gardens, parks, along roads and feed on detritus and rotting plant material.

Taxonomy

The taxon was founded in 1852 by Robert James Shuttleworth as Helix servilis . The taxon can be found in the literature under various names (synonyms): Toltecia pusilla (Lowe, 1831), Pleuropunctum micropleuros (Paget), Punctum pusillum (Lowe), Vallonia patens and Paralaoma caputspinulae. The taxon is widely recognized.

literature

  • Michael P. Kerney, RAD Cameron & Jürgen H. Jungbluth: The land snails of Northern and Central Europe. 384 pp., Paul Parey, Hamburg & Berlin 1983, ISBN 3-490-17918-8 , pp. 137/38.

Individual evidence

  1. ↑ Jürgen H. Jungbluth and Dietrich von Knorre: Trivial names of land and freshwater mollusks in Germany (Gastropoda et Bivalvia). Mollusca, 26 (1): 105-156, Dresden 2008 ISSN  1864-5127 , p. 121.
  2. ^ A b Bernhard Hausdorf: Introduced land snails and slugs in Colombia. Journal of Molluscan Studies, 68: 127-131, 2002
  3. ↑ Patrick V. Kirch, Carl C. Christensen, David W. Steadman: Subfossil Land Snails from Easter Island, Including Hotumatua anakenana, New Genus and Species (Pulmonata: Achatinellidae). Pacific Science, 63 (1): 105-122 2009 BioOne .
  4. ↑ Carl C. Christensen, Norine W. Yeung & Kenneth A. Hayes: First Records of Paralaoma servilis (Shuttleworth, 1852) (Gastropoda: Pulmonata: Punctidae) in the Hawaiian Islands. Records of the Hawaii Biological Survey for 2011: Occasional Papers, 112: 3-7, 2012 PDF
  5. ^ A. Rumi, J Sánchez, NS Ferrando: Theba pisana (Müller, 1774) (Gastropoda, Helicidae) and other alien land molluscs species in Argentina. Biological Invasions, 12 (9): 2985-2990, 2010 doi : 10.1007 / s10530-010-9715-x
  6. ↑ a b Vollrath Wiese: The land snails of Germany. 352 p., Quelle & Meyer, Wiebelsheim 2014, ISBN 978-3-494-01551-4 (p. 156/57)
  7. ↑ Robert James Shuttleworth: Diagnoses of some new [sic] mollusks from the Canary Islands. Mittheilungen der Naturforschenden Gesellschaft in Bern, 1852 (241/242): 137-146, Bern 1852 Online at Biodiversity Heritage Library , p. 140.
  8. ^ A b Francisco W. Welter Schultes: European non-marine molluscs, a guide for species identification = identification book for European land and freshwater mollusks. A1-A3 S., 679 S., Q1-Q78 S., Göttingen, Planet Poster Ed., 2012 ISBN 3-933922-75-5 , ISBN 978-3-933922-75-5 (S. 203)
  9. ↑ Fauna Europaea: Paralaoma servilis (Shuttleworth, 1852)
  10. ↑ MolluscaBase: Paralaoma servilis (Shuttleworth, 1852)
  11. ↑ AnimalBase: Paralaoma servilis (Shuttleworth, 1852)