Misunderstood gloss snail
| Misunderstood gloss snail | ||||||||||||
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Misjudged gloss snail ( Aegopinella epipedostoma ) |
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| Scientific name | ||||||||||||
| Aegopinella epipedostoma | ||||||||||||
| ( Fagot , 1879) |
The misunderstood gloss snail ( Aegopinella epipedostoma ) is a species of land living snail belonging to the family of the gloss snail (Oxychilidae). In individual cases, the species cannot be reliably distinguished from the wide- mouthed gloss snail ( Aegopinella nitens ) by examining the soft tissue, rather than by its shell morphology .
features
The right-hand winding case is low-conical. It measures 10 to 13 mm in width and 5 to 7.5 mm in height. There are 4½ to 5 moderately curved turns. The last quarter of the ending in front of the mouth expands significantly to one and a half times and the top also slopes down just before the mouth. The seam is also clearly formed, but not particularly deep. The mouth is inclined to the coil axis. When viewed from above, it is obliquely flattened-elliptical in outline, apart from the indentation of the previous turn. In the side view, the seam line drops sharply. The mouth edge is straight and sharp or not thickened. The navel is wide and slightly eccentric.
The housing is light yellow to brownish with partly clear growth stripes. The base is milky whitish. The surface is moderately glossy.
The soft body is bluish to dark blue in color. In the hermaphroditic genitalia, the upper part of the vagina is swollen and the very short stalk of the spermathec ends here. This extends with the bladder only to the outlet of the spermatic duct (vas deferens) from the egg duct (spermoviduct). The free fallopian tube (oviduct) is about as long as the vagina. The long penis is relatively thick and curved in a U-shape in the distal part. It goes over into the epiphallus with a strong constriction. The penile retractor muscle attaches to the epiphallus. The epiphallus is very thin and short in relation to the penis (ratio about 1: 3). However, there are considerable differences in the z. T. populations located far from each other are present.
Similar species
The shell is almost identical to that of the long-mouthed gloss snail ( Aegopinella nitens ). The last quarter of the end turn usually widens a little more and is usually a little more sloped or falls off a little more. The growth strips are usually a little more pronounced. In individual cases, however, the two types can only be reliably differentiated by examining the genital apparatus. The misunderstood gloss snail has a club-shaped swelling in the upper part of the vagina, into which the short stalk of the spermathek joins. The ratio of epiphallus to penis is significantly greater in both the reddish gloss snail ( Aegopinella nitidula ) and the wide- mouthed gloss snail ( Aegopinella nitens ), about 1: 2. The penile retractor muscle attaches to the epiphallus / penis transition. In the heat- loving gloss snail ( Aegopinella minor ), the epiphallus is about twice as long as the penis.
Geographical distribution and habitat
The main distribution area is the Pyrenees and their foothills. Otherwise, a larger area extends from the border mountains between the Czech Republic and Slovakia on the one hand, and Poland on the other, to western Ukraine. There are also two isolated occurrences in Germany (Taunus, Hessen, Allgäu), one occurrence in the border area of Slovenia and Croatia, and one occurrence in northern Russia ( Veliky Novgorod ).
The species lives in moist mountain forests in the leaf litter, in cool and damp places along rivers.
Way of life
According to observations on individuals in Poland, the eggs were laid deep in the moss in May / June. The young hatched from July to September. The case already had 1.1 to 1.7 turns and a diameter of one millimeter. About half a turn was added per month. By winter, 2.6 to 3.4 windings were made. After a hibernation, growth resumed in spring. By May / June there were then around 4 turns and sexual maturity was reached. Most specimens die after oviposition, but some individuals even hibernate again.
Taxonomy
The taxon was described by Paul Fallot in 1879 in the original combination Zonites epipedostoma Bourguignat. However, Bourguignat has not published any kind of this name, so that the first description must be ascribed to Paul Fagot. The taxon is generally accepted as belonging to the genus Aegopinella Lindholm, 1927. The position of the genus Aegopinella is, however, treated controversially. In the MolluscaBase it is part of the Gastrodontidae family, while the Fauna Europaea lists the genus under the Oxychilidae. They also list other works among the Oxychilidae, so these sources are followed.
MolluscaBase and Fauna Europaea excrete two subspecies:
- Aegopinella epipedostoma epipedostoma (Fagot, 1879), the nominate subspecies
- Aegopinella epipedostoma iuncta Hudec, 1964
Danger
According to the IUCN's assessment of the population , the species is not endangered. There is insufficient data on the stock situation for Germany.
literature
- 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. 166
- Adolf Riedel: About the Aegopinella species (Gastropoda, Zonitidae) from Yugoslavia, Italy and France. Annales Zoologici, 37 (5): 235-258, 1983 PDF
Individual evidence
- ↑ Jürgen H. Jungbluth and Dietrich von Knorre: Trivial names of land and freshwater mollusks in Germany (Gastropoda et Bivalvia). Mollusca, 26 (1): 105-156, Dresden 2008, ISSN 1864-5127 , p. 123
- ^ Alexandru V. Grossu: Gastropoda Romaniae 4 Ordo Stylommatophora Suprafam: Arionacea, Zonitacea, Ariophantacea şi Helicacea. 564 S., Bucharest 1983, pp. 119-122.
- ^ A b 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 (p. 396)
- ↑ Elżbieta Kuźnik-Kowalska: Age structure and growth rate of Aegopinella epipedostoma (Fagot, 1879) (Gastropoda: Pulmonata: Zonitidae). Folia Malacologica, 14 (2): 71-74, 2006. PDF
- ^ Paul Fagot: Mollusques quaternaires des environs de Toulouse et de Villefranche (Haute-Garonne). Bulletin de la Société d'Histoire Naturelle de Toulouse, 13: 282-304, 1879 Online at Biodiversity Heritage Library , p. 286.
- ↑ a b Fauna Europaea: Aegopinella epipedostoma (Fagot, 1879)
- ↑ AnimalBase: Aegopinella epipedostoma (Fagot, 1879)
- ↑ a b Vollrath Wiese: The land snails of Germany. 352 pp., Quelle & Meyer, Wiebelsheim 2014, ISBN 978-3-494-01551-4 (p. 178)
- ↑ MolluscaBase: Aegopinella epipedostoma (Fagot, 1879)
- ↑ The IUCN Red List of Threatened Species: Aegopinella epipedostoma (Fagot, 1879)