Voluta
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Voluta ebraea in situ |
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| Linnaeus , 1758 |
Voluta is the name of agenus of snails from the family of roller snails , the three to five large species of which are found in the western Atlantic on the coast of South America and the Caribbean .
features
The very solid, axially ribbed, right-hand wound casings of the Voluta species are more or less top-shaped or doubly conical, with the circumference of the body forming the higher and the thread with knots and cusps forming the lower. The whitish housings have eye-catching patterns of lines, dots and lines. The snails themselves have a similar coloration and pattern to their shell. The two small black eyes are at the bottom of the antennae. Unlike other roller screws, the three species have an operculum , which, however, only takes up part of the housing mouth. It is horny and acuminate ovate with the core at the tip.
Like other roller snails, the Voluta species feed on snails and mussels .
Like all roller snails, the snails of the genus Voluta are sexually separated with internal fertilization. The females attach up to 3 cm large hemispherical egg capsules, which contain about 5 eggs in a protein-rich nutrient medium, with the flat side on a solid substrate. The development to the finished screw takes place entirely in the capsule. After about two to three months, up to 5 young snails hatch from a capsule, the shell of which can be over 1 cm long.
Species and their distribution
The three to five species of the genus Voluta live in the western Atlantic Ocean in waters of South America and the Caribbean . The three undisputedly recognized species are the Hebrew roller ( Voluta ebraea ) on the coast of Brazil , the note snail or note roller ( Voluta musica ) on the coasts of Colombia , Venezuela , Suriname and the Antilles, and Voluta virescens on the coast of Costa Rica , Panama and Colombia. The species are isolated from one another by the mouth of the Amazon, which is rich in freshwater . The lack of a pelagic Veliger stage leads to a limited distribution and thus favors the differentiation of the species.
History of the system
In 1758 Linnaeus describes the genus Voluta as a snail with a one-piece spiral shell with a wide open, notched mouth without a channel, with a spindle ( columella ) folded on the inner lip and without a navel. Due to these morphological characteristics of the snail shell , it includes other species such as the olive snail and the Mitra snail in this genus in addition to the roller snails .
As a type species which is touch screw ( Voluta musica ) were fixed. The scope of the genus has since been narrowed down more and more. For example, the genus Oliva was established for olive snails in 1789 by Jean Guillaume Bruguière and for Mitra snails, the genus Mitra was established in 1798 by Jean-Baptiste de Lamarck . In the first half of the 19th century, new genera of its own followed within the now recognized family of roller snails, such as Melo in 1826 by George Brettingham Sowerby I and Cymbiola in 1831 by William Swainson . The consequence was a relatively early narrowing of the term Voluta to the West Atlantic roller snails. For a long time, however, there were species descriptions based solely on empty housings that had been delivered to Europe. Linnaeus believed Voluta ebraea to be an East Indian species, and it was not until 1874 that Wilhelm Kobelt established beyond any doubt that the case of this species came from Brazil .
literature
- Frank Riedel: Origin and evolution of the "higher" Caenogastropoda . Berliner Geoscientific Abhandlungen, Series E, Volume 32, Berlin 2000, 240 pages, ISBN 3-89582-077-6 .
- Rudo von Cosel (1976): Contribución al conocimiento del género Voluta Linné, 1758 (Prosobranchia) en la costa del Caribe de Colombia (PDF; 1.4 MB) . Boletín de investigaciones marinas y costeras 8 (Communications from the Instituto Colombo-Alemán de Investigaciones Científicas Punta de Betín), pp. 83-104.
Individual evidence
- ↑ Carolus Linnaeus : Systema Naturae. 10th ed., Lars Salvius: Stockholm 1758, p. 729: No. 287. Voluta. Animal Limax. Testa unilocularis, spiralis. Apertura effusa, ecaudata, basi emarginata. Columella plicata: Labio interiore aut umbilico nullo.
- ↑ Carolus Linnaeus : Systema Naturae. 10th ed., Lars Salvius: Stockholm 1758, p. 733. 370. Voluta Musica. V. testa fusiformi, anfractibus spinis obtusis, columella octoplicata. Habitat in O. Americae ad Jamaicam, Barbados. (Voluta with a spindle-shaped shell, the edges of which have blunt spines, and an eight-fold spindle. Lives in the ocean of America off Jamaica and Barbados.)
- ^ Wilhelm Kobelt (1874): On the marine fauna of Brazil . Bulletin of the German Malacoological Society 8, p. 57.
