Rupestrella

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Rupestrella
Rupestrella rupestris

Rupestrella rupestris

Systematics
Order : Lung snails (pulmonata)
Subordination : Land snails (Stylommatophora)
Superfamily : Pupilloidea
Family : Corn snails (Chondrinidae)
Subfamily : Chondrininae
Genre : Rupestrella
Scientific name
Rupestrella
Monterosato , 1894

Rupestrella is a genus of the grain snails (Chondrinidae) from the suborder of the land snails (Stylommatophora).

features

The housing of the representatives of the genus Rupestrella are comparatively small, squatly conical to very slender conical. They are up to about 5 mm high, with a diameter of about 2 mm and have up to about 6, mostly strongly arched turns, which in most species increase more or less continuously. The surface is finely striped radially to very coarsely ribbed. Usually, however, the housings are encrusted with rock dust. The mouth is not or only slightly widened, the edge of the mouth thin and only slightly thickened. The reinforcement of the mouth consists of a maximum of two simple palatal folds, a parietal fold, an angular fold and two short spindle folds. This mouth reinforcement can be reduced to a greater or lesser extent or even be absent entirely.

In the male genital tract, the penis has an epiphallus that is longer than the actual penis. The transition is marked by a thickening. The penile retractor muscle starts in the upper third of the penis or even at the thickening in the penis / epiphallus transition area. There is no blind sac (caecum or flagellum). The spermatic duct is not twisted and comparatively short. It is free in the basal area of ​​the penis, i.e. H. not integrated into the tissues of the penis. In the female tract, the vagina and free fallopian tubes taken together are slightly shorter or only slightly longer than the penis. The free fallopian tube is short to very short. The stem of the seminal vesicle is long to very long; it is not embedded in the prostate gland. The seminal vesicle lies next to the egg ladder (spermoviduct), but can also reach the albumin gland ( Rupestrella homala ).

The radula has 19 to 24 posterior teeth in a semi-transverse row next to the central tooth, the main tips of which are not always clearly visible. Two relatively narrow supporting cusps sit on the basal plate of the central tooth. In the posterior teeth immediately following outwards, there is a single supporting cusp on the basal plate; but which is a bit bigger.

Geographical distribution and habitat

The genus occurs in southern Mediterranean Europe, North Africa and East Africa (Somalia). It is very likely that these are exclusively "rock snails", i. H. species living on the surface of rocks, mostly limestone rocks. There they graze endolithic lichens.

Taxonomy and systematics

The genus was proposed by Tommasso Allery di Monterosato in 1894 . Anatolij Schileyko put it in 1998 in the synonymy of Chondrina (Granopupa) Boettger, 1889. The later authors and the Fauna Europaea did not follow this. The following species and subspecies are currently assigned to the genus:

supporting documents

literature

  • Karl-Heinz Beckmann: Elements of a revision of the endemic Rupestrelles of Sicily. In: Falkner, M., Groh, K. & Speight, MCD: Collectanea malacologica. Festschrift for Gerhard Falkner. Pp. 49-78, ConchBooks, Hackenheim 2002.
  • Edmund Gittenberger: Contributions to the knowledge of the pupillacea: III. Chondrininae. Zoologische Verhandelingen, 127 (1): 3-267, 1973 ISSN  0024-1652 PDF .
  • Henry Augustus Pilsbry: Manual of Conchology. Second Series: Pulmonata, 24. Pupillidae (Gastrocoptinae). SI-XII, pp. 1-380, Philadelphia, 1916-1918 online at www.archive.org (p. 341).
  • Anatolij A. Schileyko: Treatise on Recent terrestrial pulmonate molluscs, Part 1. Achatinellidae, Amastridae, Orculidae, Strobilopsidae, Spelaeodiscidae, Valloniidae, Cochlicopidae, Pupillidae, Chondrinidae, Pyramidulidae. Ruthenica, Supplement 2 (1): 1-126, Moscow 1998 ISSN  0136-0027
  • 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

Individual evidence

  1. ^ Tommaso Allery di Monterosato: Conchiglie terrestri viventi e fossili di Monte Pellegrino. Il Naturalista Siciliano 13 (9): 165-173. Palermo 1894 Online at www.biodiversitylibrary.org (p. 170)
  2. ^ A b Fauna Europaea: Rupestrella Monterosato, 1894
  3. ↑ Bas Kokshoorn, Edmund Gittenberger: Chondrinidae taxonomy revisited: New synonymies, new taxa, and a checklist of species and subspecies (Mollusca: Gastropoda: Pulmonata). Zootaxa, 2539: 1-62, 2010 Preview (PDF; 22 kB)

On-line

Web links

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