Rough diaper snail
| Rough diaper snail | ||||||||||||
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Rough diaper snail ( Columella aspera ) |
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| Columella aspera | ||||||||||||
| Waldén , 1966 |
The rough diaper snail ( Columella aspera ) is a type of snail of the family of the diaper snail (Vertinigidae) from the suborder of the land snail (Stylommatophora).
features
The shell of the rough diaper snail is 2.0 to 2.5 mm high and 1.3 to 1.4 mm wide. It has up to six strongly arched turns, which are separated from each other by a deep seam. The case is dark gray-brown or horn-brown. The surface of the case is matt and shows comparatively regular growth stripes. The mouth is broadly elliptically rounded, almost straight at the top and therefore only slightly wider than it is high. The mouth rim is simple and thin. Only in the spindle area is it bent and the needle-shaped navel is almost completely covered.
Similar species
The shell of the rough diaper snail resembles that of the toothless diaper snail ( Columella edentula ). It is a little lower and a little wider. The surface shows stronger and more regular growth strips. The surface is less shiny and is usually darker in color. The mouth is slightly higher in relation to the width. Differentiating the two types can be difficult in individual cases. The rough diaper snail prefers somewhat drier locations than the toothless diaper snail.
Geographical distribution and habitat
The rough diaper snail probably has a Palearctic distribution. Due to the fact that until 1966 there was no differentiation between the toothless diaper snail ( Columella edentula ) and the rough diaper snail ( Columella aspera ), the exact distribution pattern is only incompletely known. It occurs from Spain and the British Isles in the west to Siberia ( Lake Baikal ). It is absent in northernmost Scandinavia, and from Italy there is so far only evidence of the island of Elba and Sardinia . It is also found on Madeira Island .
The rough diaper snail lives in deciduous and coniferous forests, on the edges of forests, uncultivated meadows in more dry locations with rather lime-poor, even acidic soils. It also occurs in the mountains.
Way of life
The mating and egg-laying of the rough diaper snail takes place in Poland on rainy days at temperatures of 17 to 20 ° (rarely higher) between June and September. The relatively large (0.7 to 0.85 mm in longitudinal diameter), oval and colorless eggs with a non-calcified shell are laid individually on the upper, concave sides of the leaves of mosses on rainy days. Leaves close to the stem are often chosen, which, when the drought begins, lie close to the stem and thus enclose the egg between the leaf and the stem. In total, only about 5 eggs are produced per individual and season (but under laboratory conditions). The young hatch after 20 to 30 days with an enclosure that already has 1.3 coils from the egg shell. The speed of development is strongly dependent on temperature; at 21.5 ° C 23 days development time, at 17.5 ° 29 to 30 days development time. The young grow only slowly and overwinter as half-adults. In the spring of the following year they become sexually mature and mate. However, individuals were also observed who overwintered a second time before the onset of sexual maturity. The sexually mature animals continue to grow slowly up to a maximum lifespan of three years.
Taxonomy
The taxon was first described from Sweden by Henrik Waldén in 1966. It was previously always subsumed under the toothless diaper snail. It was subsequently found in other areas as well. Nevertheless, the range of the species is still quite uncertain. It can be expected that it will be found in other areas.
Danger
The species is not endangered in Germany.
literature
- Klaus Bogon: Land snails biology, ecology, biotope protection. 404 p., Natur Verlag, Augsburg 1990, ISBN 3-89440-002-1 , (p. 105/6)
- Rosina Fechter and Gerhard Falkner: molluscs. 287 pp., Mosaik-Verlag, Munich 1990 (Steinbach's Nature Guide 10), ISBN 3-570-03414-3 , (p. 140)
- 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. 87)
- Stanisław Myzyk: Contribution to the biology of ten vertiginid species. Folia Malacologica, 19 (2): 55-80, Warsaw 2011, doi : 10.2478 / v10125-011-0004-9 .
- Beata M. Pokryszko: The Vertiginidae of Poland (Gastropoda: Pulmonata: Pupilloidea) - a systematic monograph. Annales Zoologici, 43 (8): 133-257, Warsaw 1990.
- 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 , (S. 120)
Individual evidence
- ↑ Simone Cianfanelli, Gianbattista Nardi, Marco Bodon: A new record for the Italian fauna: Plagyrona placida (Shuttleworth, 1852) from Sardinia and Southern Italy (Gastropoda Pulmonata Valloniidae). Biodiversity Journal, 3 (4): 527-542 PDF
- ↑ Henrik W. Waldén, HW: Some remarks on the supplementary volume to Ehrmann's "Mollusca", in "Die Tierwelt Mitteleuropas" . Archiv für Molluskenkunde, 95 (1/2): 49-68, Frankfurt 1966. ISSN 0003-9284
- ^ Vollrath Wiese: The land snails of Germany. 352 pp., Quelle & Meyer, Wiebelsheim 2014 ISBN 978-3-494-01551-4 (p. 59)
