Pyramidula umbilicata

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Pyramidula umbilicata
Pyramidula umbilicata

Pyramidula umbilicata

Systematics
Order : Lung snails (pulmonata)
Subordination : Land snails (Stylommatophora)
Superfamily : Pupilloidea
Family : Pyramid snails (Pyramidulidae)
Genre : Pyramidula
Type : Pyramidula umbilicata
Scientific name
Pyramidula umbilicata
( Montagu , 1803)

Pyramidula umbilicata is a species of snail in the family of pyramid snails (Pyramidulidae) from the suborder of land snails (Stylommatophora).

features

The small, right-hand wound housing is flat-conical; it measures 2.05 to 2.9 mm in width and 1.3 to 2.05 mm in height. It is therefore very distinctly wider than it is high, the H / B index varies from 0.56 to 0.74 (mean 0.65). In the adult stage, the turns (four turns), which increase uniformly up to five, are well rounded on the periphery and separated from each other by a deep seam. The mouth is transversely elliptical and is oblique to the axis of the winding. The edge of the mouth is mostly straight and pointed, only slightly turned over in the navel area. The navel is wide open and takes up about a third of the width of the case.

The case is gray-brown and the surface shows very fine, closely spaced growth strips.

Distribution in Western Europe (from Welter-Schultes, 2012)

Geographical distribution and habitat

The range of the species are the British Isles as well as Northern Spain and the Pyrenees . So far there is also a site in central Portugal.

The animals live on limestone rocks and limestone walls, even on walls built with lime cement. During the day they crawl into pits, crevices and cracks. They are active at night and in damp weather. They feed on endolithic algae and also lichens, which are scraped off with the radula and ingested with a lot of gravel.

Taxonomy

The taxon was introduced into scientific literature in 1803 by Georges Montagu as Helix umbilicata . Today it is almost universally recognized as a valid taxon. The syntypes are kept in the Royal Albert Memorial Museum in Exeter .

Seddon et al. (2014) consider the taxon to be invalid and assign the specimens from the British Isles to Pyramidula pusilla .

Danger

The species was assessed as not endangered in the British Isles in 2014.

literature

  • Edmund Gittenberger, Ruud A. Bank: A new start in Pyramidula (Gastropoda Pulmonata: Pyramidulidae). Basteria, 60 (1/3): 71-78, Leiden 1996 PDF

Individual evidence

  1. ↑ a b Martínez-Ortí, A., Gómez-Moliner, BJ & Prieto, CE El género Pyramidula Fitzinger 1833 (Gastropoda, Pulmonata) en la Península Ibérica. Iberus 25 (1): 77-87, 2007 Online at Biodiversity Heritage Library (accessed June 13, 2018)
  2. ↑ a b Georges Montagu: Testacea Britannica, or natural history of British shells, marine, land, and fresh-water, including the most minute: systematically arranged and embellished with figures. Pp. I-XXXVII (= 1-37), 1-606, pl. 1-16, White, London, 1803 Online at Biodiversity Heritage Library , p. 434.
  3. ↑ Thomas Brown: Illustrations of the Land and Fresh Water Conchology of Great Britain and Ireland, with figures, descriptions, and localities of all the species. Smith, Elder & Co., London, 1845 Online at GoogleBooks p. 80.
  4. ↑ AnimalBase: Pyramidula umbilicata (Montagu, 1803)
  5. ↑ Asturnatura: Pyramidula umbilicata (Montagu, 1803)
  6. ↑ Fauna Europaea: Pyramidula umbilicata (Montagu, 1803)
  7. ↑ Sandra Kirchner, Josef Harl, Luise Kruckenhauser, Michael Duda, Helmut Sattmann, Elisabeth Haring: Phylogeography and systematics of Pyramidula (Pulmonata: Pyramidulidae) in the eastern Alps: still a taxonomic challenge. Journal of Molluscan Studies, 82: 110-121, 2016. doi : 10.1093 / mollus / eyv047
  8. ↑ MolluscaBase: Pyramidula umbilicata (Montagu, 1803)
  9. ↑ 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. 215)
  10. ↑ Mollusca Types in Great Britain: Helix umbilicata Montagu, 1803
  11. ↑ PG Oliver H. Morgenroth: Additional Type and other Notable specimens of Mollusca from the Montagu Collection in the Royal Albert Memorial Museum & Art Gallery, Exeter. Zoosystematics and Evolution 94 (2): 281-303, 2018. doi : 10.3897 / zse.94.24776
  12. ^ A b M. B. Seddon, Ian J. Killeen, AP Fowles: A Review of the Non-Marine Mollusca of Great Britain: Species Status No. 17. Natural Resources Wales, 2014 PDF (accessed June 13, 2018)