Chondrina gerhardi
| Chondrina gerhardi | ||||||||||||
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| Scientific name | ||||||||||||
| Chondrina gerhardi | ||||||||||||
| Gittenberger , 2002 |
Chondrina gerhardi is a type of grain snail (Chondrinidae) from the suborder of land snails (Stylommatophora).
features
The slim, conical housing is 4.9 to 6.3 mm high and 2.1 to 2.4 mm wide. The 6 to 7 moderately curved turns are irregularly striped. The mouth reinforcement is largely reduced. There is only a more or less strong Columellaris. Occasionally a very poorly developed parietalis is indicated. The edge of the mouth is only slightly thickened by a white lip, which is also not created in the form of a swell. The base of the mouth is not rounded in a U-shape, but is obliquely V-shaped in the frontal view; the palate is slightly flattened. In the area of the (non-existent) infrapalatalis, there is a short notch in some cases.
In the male part of the reproductive system, the penis and epiphallus are fused together in the lower penis area and form a comparatively short loop. The epiphallus is shorter and slightly thinner than the penis; the penis / epiphallus transition is marked below the bend of the loop by a clear decrease in diameter. The "free" penis, i.e. H. from the point where it joins the atrium to where it adjoins the epiphallus, it is about a third of the length of the loop. More or less distinct, fine transverse wrinkles are formed on the inner wall of the penis. Just before the bend and in the thick part of the loop after the bend, there is a longitudinal structure. The inner wall of the epiphallus has a finely cross-wrinkled longitudinal structure. The penile retractor muscle attaches to the first third of the loop.
The vagina is very long relative to the very short free fallopian tube. The vagina is also three to four times longer than the "free" part of the penis. The spermatic duct lies close to the vagina. The stem of the seminal vesicle is very long; it is initially twice as wide as the free fallopian tube.
The radula has 33 to 34 posterior teeth in the semi-transverse row in addition to the central tooth. i
Similar species
The housing of Chondrina gerhardi is very similar to the housing of Chondrina farinesii , especially the subspecies Chondrina farinesii farinesii , due to the greatly reduced muzzle reinforcement and the general habitus . However, it is slightly flattened on the palate, so that the base is more V-shaped than U-shaped. Chondrina farinesii , however, forms a rudimentary flagellum in the male part of the sexual apparatus, which is missing in Chondrina gerhardi . The atrium is significantly longer in Chondrina farinesii . The housing of Chobdrina oligodonta has a broad, U-shaped rounded housing base. Chondrina falkneri is significantly larger on average. In chondrina falkneri, the columellaris are very weakly developed or completely absent and the angularis is usually present, even if weakly developed. 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 is so far only known from the type locality from the Combe de Queyras (Gorges du Guil) in the French department of Hautes-Alpes . She lives in 1100 m altitude sympatric with the subspecies chondrina avenacea avenacea the Western Oat grain auger .
Taxonomy
The taxon was first described in 1973 by Edmund Gittenberger in open nomenclature as " Chondrina spec. 2". 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 so far only known from the type locality. It is therefore classified by the International Union for Conservation of Nature and Natural Resources (IUCN) as "Vulnerable". Although the deposit is in a nature park, it is not protected from the potential dangers such as road widening and the construction of quarries.
supporting documents
literature
- Edmund Gittenberger: Contributions to the knowledge of the pupillacea. Part 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
- ^ 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 gerhardi E. Gittenberger 2002
- ↑ Gargominy, O. 2011. Chondrina gerhardi . In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. <www.iucnredlist.org>. Retrieved October 8, 2013.