Chondrina falkneri
| Chondrina falkneri | ||||||||||||
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| Scientific name | ||||||||||||
| Chondrina falkneri | ||||||||||||
| Gittenberger , 2002 |
Chondrina falkneri is a kind of grain snail (Chondrinidae) from the suborder of the land snail (Stylommatophora).
features
The slim, conical case is 6.0 to 7.3 mm high and 2.5 to 2.8 mm high. It has 6¾ to 7¾ moderately to heavily curved turns. The surface has very fine, closely spaced, z. T. very regular growth strips. The mouth is rounded in a U-shape at the base. The mouth edge is more or less thickened by a white lip. Only an angularis is indicated as reinforcement of the mouth, and a weak to very weak (or sometimes even missing) Columellaris developed.
In the male part of the reproductive system, the penis and epiphallus are fused together around the lower part of the penis and thus form a loop. The epiphallus is significantly shorter than the penis; the transition is marked by a strong narrowing below the bend of the loop. A sac or flagellum is missing. The "free" penis, i.e. H. from the confluence with the atrium to the point where it fuses with the epiphallus is relatively long and reaches about a quarter to almost a third of the length of the loop. The inner wall of the penis does not have any particular structure in the first third of the loop. In the following third there are numerous fine transverse wrinkles, and in the following section including the first third of the distal half there is only a longitudinal structure. The inner wall of the epiphallus has numerous small papillae. The penile retractor muscle attaches to the first quarter of the loop. In the female part of the sexual apparatus, the vagina is moderately long, the vagina is about the length of the "free" penis. The stem of the seminal vesicle (spermathec) is moderately long, the seminal vesicle itself does not reach the albumin gland. At the branching stalk of the seminal vesicle / fallopian tube, the stalk is initially one and a half times as wide as the free fallopian tube.
Similar species
The housing of Chondrina falkneri , with its greatly reduced muzzle reinforcement, can not be reliably distinguished from the housing of Chondrina farinesii farinesii . Chondrina farinesii , however, differs significantly from Chondrina falkneri in terms of the sexual apparatus (formation of a rudimentary flagellum) . The atrium is significantly longer in Chondrina farinesii . Chondrina gerhardi is difficult to distinguish in the housing and the reduced muzzle reinforcement . Chondrina gerhardi is much smaller on average. in this species a more or less strong columellaris is always present; a very weakly developed parietalis is rarely indicated. The ascending chondrina can also be very similar in extreme forms with greatly reduced muzzle reinforcement. As far as is known, this species occurs only in the Pyrenees and the neighboring areas to the south.
Geographical distribution and habitat
The species occurs in the French western Alps (Rémuzat, Département Drôme, St. Martin-en-Vercors, Isére, surroundings of Grenoble) at about 500 to 680 m above sea level. According to Margier (1913: 199), Chondrina falkneri lives sympathetically with Chondrina avenacea avenacea on the same rock.
Taxonomy
The taxon was first described in 1973 by Edmund Gittenberger in open nomenclature as " Chondrina spec. 1". In 2002 Gittenberger described the taxon as a new species. It is recognized by Fauna Europaea. The taxon is named after Gerhard Falkner, one of the leading German malacologists .
Danger
The species is classified as "Near Threatened" by the International Union for Conservation of Nature and Natural Resources (IUCN).
supporting documents
literature
- Edmund Gittenberger: Contributions to the knowledge of the pupillacea: III. Chondrininae. In: Zoologische Verhandelingen. 127 (1) 1973, ISSN 0024-1652 , pp. 3-267. (PDF, p. 142ff.)
- Francisco W. Welter-Schultes: European non-marine molluscs, a guide for species identification = identification book for European land and freshwater mollusks. Planet Poster Ed., Göttingen 2012, ISBN 978-3-933922-75-5 .
Individual evidence
- ^ Eugène Margier: Le Pupa Farinesi Desmoul. dans les Alpes. In: Feuille des jeunes Naturalistes. 43 (516), Paris 1913, p. 199. (online at www.biodiversitylibrary.org)
- ^ Edmund Gittenberger: Two more sibling Chondrina species, endemic for France (Gastropoda, Pulmonata, Chondrinidae). In: Margrit Falkner, Klaus Groh, Martin Specht (Eds.): Collectanea Malacologica. Hackenheim 2002, ISBN 3-925919-61-9 , pp. 41-47.
- ↑ Fauna Europaea: Chondrina falkneri. E. Gittenberger 2002
- ↑ Gargominy, O. 2011. Chondrina falkneri . In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. <www.iucnredlist.org>. Retrieved October 8, 2013.
On-line
annotation
- ↑ The length of the free fallopian tube is not specified by Gittenberger.