Chondrina bigorriensis
| Chondrina bigorriensis | ||||||||||||
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Chondrina bigorriensis |
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| Scientific name | ||||||||||||
| Chondrina bigorriensis | ||||||||||||
| ( Des Moulins , 1835) |
Chondrina bigorriensis is a species of grain snails (Chondrinidae) from the suborder of land snails (Stylommatophora).
features
The slim spindle-shaped to slim cone-shaped housing is 5.7 to 9.0 mm high and 2.2 to 2.8 mm wide. The 7 to almost 9 turns are moderately curved, the tip of the case is comparatively blunt. The surface is finely and regularly ribbed; the ribbing often becomes somewhat weaker on the last turn, almost smooth, and also becomes more irregular. The case is colored dark horn brown. The edge of the mouth is moderately to strongly thickened and turned over, but not flattened and also not contiguous in the parietal region. The mouth reinforcement consists of 8 teeth. The spiral is mostly connected to the angularis. There is a strong parietalis in the neck area. In the spindle area the columellaris is more strongly developed than the infracolumellaris. In the palate area, the Palatalis Superior is higher and longer than the Palatalis Inferior. The infrapalatalis is even shorter and lower and can occasionally be absent. A small, hump-shaped suprapalatalis may be present or absent. A suturalis is also missing. A basalis is occasionally present. The end turn is often slightly shouldered. It is obliquely flattened in the neck area. There is sometimes an indentation in the infrapalatalis area. The base is often clearly keeled.
In the male part of the reproductive system, the penis and epiphallus are fused together in the lower part of the penis and form a loop. The penis or the penis half is thicker than the epiphallus half. The "free" penis, i.e. H. the part of the penis between the atrium and the penis / epiphallus is quite short; it is only about fifth to a quarter of the length of the loop. The penile retractor muscle starts in the first quarter to first fifth of the loop. In the first quarter of the proximal half of the penis loop, the inner wall of the penis has a longitudinal structure that is partially indistinctly wrinkled across. In the following two quarters, a transverse wrinkled structure is formed, the longitudinal structure less clear. The longitudinal structure predominates in the last quarter and in the first fifth to fourth of the distal half. Then the lumen suddenly widens at the junction between the penis and epiphallus; there are now coarse transverse wrinkles on the inner wall. In the following section of the epiphallus up to the confluence of the vas deferens there is finally a finely cross-wrinkled longitudinal structure.
In the female part of the genital system, the tube is comparatively very long and the free fallopian tube is very short. The vagina is two to four times as long as the "free" penis. The stalk of the seminal vesicle is at the stalk of the seminal vesicle / free fallopian tube, the stalk is one to almost one and a half times as wide as the fallopian tube. The seminal vesicle extends only to the prostate gland, not to the albumin gland. The stem is not embedded in the tissue of the prostate gland.
Similar species
Chondrina bigorriensis differs from Chondrina tenuimarginata by the shape of the casing (more plump casing tip and one with a less conical habit), the edge of the mouth which is not folded flat, the darker casing color and the lack of suturalis in the mouth reinforcement. Chondrina avenacea avenacea has a smaller housing in the places where it lives sympathetically with Chondrina bigorriensis . The mouth rim is more regularly curved in a U-shape in the basal area, and the surface of the case has weaker ribbing.
Geographical distribution and habitat
The distribution area extends north of the watershed from the Eastern Pyrenees to the Western Pyrenees. Only smaller occurrences are located south of the watershed in Catalonia (Benasque). The species lives in open, rocky locations from around 200 m to over 2000 m above sea level.
Taxonomy
The taxon was established in 1835 by Charles des Moulins as Pupa bigorriensis in synonymy of Pupa megacheilos var. Pusilla des Moulins, 1835. However, since Ancey (1881) and then Henry Augustus Pilsbry (1918) and f. Haas (1926) treated the taxon as a valid species, the name is available. Edmund Gittenberger gave Chondrina bigorriensis priority over Pupa megacheilos var. Pusilla des Moulins, 1835. He gives the following synonyms , the Fauna Europaea follows him:
- Pupa megacheilos var. Pusilla des Moulins, 1835
- Pupa megacheilos var. Gracilis Rossmaessler, 1842
- Pupa moquiniana sexton, 1843
- Pupa bigorriensis var. Sinistrorsa Ancey, 1881 (nom. Nud.)
- Pupa hospitii Fagot, 1888
- Pupa aureacensis Locard, 1894
- Pupa baregiensis Locard, 1894
- Pupa oparea Locard, 1894
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 p., Paul Parey, Hamburg & Berlin 1983 ISBN 3-490-17918-8 (p. 115/6)
- 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
- ^ Charles des Moulins Description de quelques mollusques terrestres et fluviatiles de la France, nouveau ou peu connus. Actes de la Societé Linnéenne de Bordeaux, 7: 142-165, 1835 Online at www.biodiversitylibrary.org (pp. 159, 163, plate 2)
- ^ César-Félix Ancey: De quelques mollusques nouveaux ou peu connus. Le Naturaliste, 3 (51): 403-404, 1881 online at www.biodiversitylibrary.org .
- ^ 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
- ↑ Fritz Haas: The Abidas and Chondrinas of the Pyrenees and the Iberian peninsula. In: Henry Augustus Pilsbry: Manual of Conchology. Second Series: Pulmonata , 27 (108): 267-315, 1926 Online at www.archive.org (pp. 273/4).
- ↑ Fauna Europaea: Chondrina bigorriensis (Des Moulins 1835)
- ↑ Gargominy, O. 2011. chondrina bigorriensis . In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. <www.iucnredlist.org>. Retrieved October 7, 2013.
