Bowl snails
| Bowl snails | ||||||||||||
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Spotted bowl snail ( Discus rotundatus ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Patulidae | ||||||||||||
| Tryon , 1866 |
The bowl snails (Patulidae or Discidae), also called button snails , are a family from the suborder of the land snails (Stylommatophora). They are mostly small shapes with a flat casing.
features
The right-hand winding cases are flat-conical and small to medium-sized (up to approx. 7 mm in diameter). The whorls are rounded, the navel is wide. The shell is thin and translucent. It is mostly brownish and the surface is roughly ribbed across. The eggs are relatively large; the animals are oviparous, d. H. Finished little animals hatch from the eggs.
Occurrence and way of life
The family is distributed Holarctic, with the maximum diversity in North America. There are only three species in Europe. They live in forests under leaves or on rotten wood.
Systematics
The family of bowl snails (Discidae) belongs to the superfamily Punctoidea. The scientific name is still unclear. The oldest surname is based on a younger synonym of Discus , Patula Held, 1837. While some authors indicate the priority of this surname, other authors use the Discus- based but younger and more commonly used surname Discidae. In older publications, the Endodontidae family is referred to as bowl snails. In this older view, however, the species of the genus Discus , which are known as bowl snails i. e. S. are included in the family Endodontidae. Today the families Endodontidae and Discidae (= Patulidae) are considered as separate families.
- Bowl snails (Patulidae Tryon, 1866 = Discidae Thiele, 1931)
- Genus Discus Fitzinger, 1833 (with numerous subgenera) (syn .: Patula Beck, 1837)
- Spotted bowl snail ( Discus rotundatus (OF Müller, 1774))
- Brown bowl snail ( Discus ruderatus (Férussac, 1821))
- Keeled bowl snail ( Discus perspectivus (Megerle von Mühlfeld, 1816))
- Genus Anguispira Morse, 1864
- Genus Speleodiscoides Smith, 1957
- Genus Zonodiscus Pilsbry, 1948
- Genus Discus Fitzinger, 1833 (with numerous subgenera) (syn .: Patula Beck, 1837)
literature
- Rosina Fechter and Gerhard Falkner: molluscs . 287 pp., Mosaik-Verlag, Munich 1990 (Steinbach's Nature Guide 10), ISBN 3-570-03414-3
- Michael P. Kerney, RAD Cameron & Jürgen H. Jungbluth: The land snails of Northern and Central Europe. 384 pp., Paul Parey, Hamburg and Berlin 1983, ISBN 3-490-17918-8
- Victor Millard: Classification of the Mollusca. A Classification of World Wide Mollusca. Rhine Road, South Africa 1997, ISBN 0-620-21261-6