Ascending chondrina
| Ascending chondrina | ||||||||||||
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Ascending chondrina |
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| Ascending chondrina | ||||||||||||
| ( Westerlund , 1878) |
Chondrina ascendens is a type of grain snail (Chondrinidae) from the suborder of land snails (Stylommatophora).
features
The spindle-shaped to conical spindle-shaped housing is 5.6 to 8.7 mm high and 2.3 to 3.1 mm wide. It has 6.5 to 8.25 moderately curved turns. The surface is very fine and regularly ribbed to fine, regularly striped, e.g. Sometimes even to almost smooth. The mouth rim is sharply bent and moderately to very strongly swell-shaped thickened. It is interrupted in the neck area. The mouth reinforcement is greatly reduced to completely reduced. Usually only the angularis, parietalis and columellaris are developed as somewhat stronger lamellae; often only the angularis can be seen more clearly. The superior and inferior palatalis, on the other hand, are usually only white, slightly thickened stripes. The last turn of the casing is not or only slightly flattened in the palate area. The housing base is therefore not keeled, but is rounded in a U-shape when viewed from the front. The housing is colored light to dark horn brown. The surface is shiny, the shell translucent.
In the male part of the genital apparatus, the penis and epiphallus are fused in the basal area of the penis; the "free" part of the penis, d. H. from the point where it joins the atrium to where it adjoins the epiphallus is very short, usually less than a quarter of the penile / epiphallus loop. The length and width of the penis / epiphallus loop vary, but the proportions remain roughly the same. The penile retractor muscle attaches to the first third to fourth of the penis / epiphallus loop. The spermatic duct lies tightly against the vagina and enters the tissue of the penis sheath before the penis / epiphallus adhere. In the first quarter of the penis / epiphallus loop (towards the atrium) there is only one longitudinal structure. In the next quarter there is also a cross wrinkle, which becomes more obvious and regular in the further course (in the third quarter). In the last quarter of the proximal half of the penis / epiphallus loop and in the first quarter to first third of the distal half, only a longitudinal structure is again formed. In the last part of the distal half there is again an initially coarse, then more regular and finer transverse wrinkle. In the last quarter or eighth before the confluence of the spermatic duct, the inner wall is only covered with papillae.
In the female part of the genital apparatus, the vagina is only moderately long, and about twice as long as the short, free fallopian tube. The vagina is also about one and a half times as wide as the free part of the penis. The stem of the seminal vesicle is comparatively long, but the seminal vesicle itself comes to lie at the level of the prostate gland and is z. T. embedded in the tissue of the prostate gland. The radula has 38 posterior teeth in the semi-transverse row next to the central tooth.
Similar species
The casing of Chondrina ascendens is very similar to the casing of Chondrina farinesi , especially the subspecies Chondrina farinesii farinesii , which also has a greatly reduced mouth reinforcement . On average, however, it is somewhat larger and usually has a more thickened mouth lip; however, small specimens with a less thickened mouth lip can hardly be distinguished. The ascending chondrina , however, can be clearly distinguished by the differently developed genital apparatus; Chondrina farinesii has a rudimentary flagellum. Also chondrina falkneri us chondrina Gerhardi differ in the housing morphology little, but come hundreds of kilometers away in front in the French western Alps.
Geographical distribution and habitat
The distribution area extends in the Pyrenees on both sides of the watershed from the Ariège in the east to the Basque Country ( Orduña , Prov. Vizcaya ) and Haro ( Province of La Rioja ) as well as near Huesca ( Aragon , Spain, south of the Ebro ).
The species lives in open, rocky habitats from 300 m to around 1700 m above sea level.
Taxonomy
The taxon was first described in 1878 by Carl Agardh Westerlund as Pupa jumillensis var. Ascendens . Edmund Gittenberger raised the taxon to the rank of a species and assigned it to the genus Chondrina . He gives the following synonyms (Fauna Europaea follows him):
- Pupa aragonica Fagot, 1888
- Pupa saltus Fagot, 1888
- Pupa ignota Fagot, 1888
- Pupa speluncae Locard, 1894
- Pupa longini fagot, 1906
- Chondrina gorbeana Pilsbry, 1918
Danger
According to the assessment of the International Union for Conservation of Nature and Natural Resources (IUCN), the species is not endangered despite its small distribution area.
supporting documents
literature
- Edmund Gittenberger: Contributions to the knowledge of the pupillacea: III. Chondrininae. Zoologische Verhandelingen, 127 (1): 3-267, 1973 ISSN 0024-1652 PDF (pp. 142ff.).
- 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 (p. 117)
- 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)
- 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
- ^ Carl Agardh Westerlund: Fauna Europæa molluscorum extramarinorum. Prodromus. Sistens descriptiones systematicas et criticas omnium generum et specierum horum animalium in Europe viventium et hodie cognitarum. Pp. 1–320, Lund 1876-1878 (p. 179) (2nd part not available online; not seen; page number according to Gittenberger, 1973)
- ↑ Fauna Europaea: Chondrina ascendens (Westerlund 1878)
- ↑ Gargominy, O. 2011. Chondrina ascendens . In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. <www.iucnredlist.org>. Retrieved October 7, 2013.
