Gastropoda

Gastropods
Class Gastropoda Cuvier, 1797

et: teod; sv: snäckor; fi: kotilot; ru: Брюхоногие;

Taxon ID: 56 / 2013-12-12
Belongs to: Mollusca
Sister taxa: Bivalvia | Diplacophora | Helcionelloida | Hyolitha | Paragastropoda | Rostroconchia | Tergomya | Cephalopoda
Contains: Bellerophontida | Eogastropoda | Orthogastropoda | Prosobranchia | Semizona
Baltoscandian species (in database): 119

Taxon overview

The Gastropoda or gastropods, more commonly known as snails and slugs, are a large taxonomic class within the phylum Mollusca.
Snails are distinguished by an anatomical process known as torsion, where the visceral mass of the animal rotates 180° to one side during development, such that the anus is situated more or less above the head. This process is unrelated to the coiling of the shell, which is a separate phenomenon. Torsion is present in all gastropods, but the opisthobranch gastropods are secondarily de-torted to various degrees.
Gastropods typically have a well-defined head with two or four sensory tentacles with eyes, and a ventral foot, which gives them their name (Greek gaster, stomach, and poda, feet). The larval shell of a gastropod is called a protoconch.
The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the early Cambrian.

Selection of related publications

  • Vinn & Wilson, 2013c. Silurian cornulitids of Estonia (Baltica)
  • Ebbestad et al., 2009. Predation on bellerophontiform molluscs in the Paleozoic
  • Frisk & Ebbestad, 2007. Paragastropoda, Tergomya and Gastropoda (Mollusca) from the Upper Ordovician Dalby Limestone, Sweden
  • Ebbestad & Högström, 2007b. Locality descriptions, the Siljan District
  • Isakar & Ebbestad, 2000. Bucania (Gastropoda) from the Ordovician of Estonia
  • Isakar et al., 1999. Homeomorphic gastropods from the Silurian of Norway, Estonia and Bohemia
  • Isakar, 1995a. The platyceratacean gastropod Cyclonema (Cyclonema) hiiumaa Teichert, 1928 from the Llandovery (Silurian) of Estonia
  • Isakar, 1991. Harjuan (Late Ordovician) new Bivalves and a new Gastropod from North Estonia
  • Kisselev et al., 1990. Atlas of Upper Ordovician and Silurian molluscs from the nort-western part of East-European platform.
  • Isakar, 1990. Bivalvia and Gastropoda
  • Rõõmusoks, 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I
  • Erisalu, päevik 5. Erisalu, päevik 5, Geoloogilise kaardistamise ekspeditsioon Nr.4, välipäevik
  • Öpik, 1930b. Beiträge zur Kenntnis der Kukruse-(C2-C3-)Stufe in Eesti. IV
  • Koken & Perner, 1925. Die gastropoden des baltischen Untersilurs
  • Bekker, 1925a. Lühike ülevaade Eesti geoloogiast. (Eozoiline ja paleozoiline ladekond)
  • Koken, 1897. Die Gastropoden des Baltischen Untersilurs
  • Koken, 1896. Die Leitfossilien. Ein Handbuch für den Unterricht und für das Bestimmen von Versteinerungen
  • Lindström, 1884. On the Silurian Gastropoda and Pteropoda of Gotland
  • Eichwald, 1861. Die Fauna und Flora des Grunsandes von Moskwa
  • Schmidt, 1858. Untersuchungen über die Silurische Formation von Ehstland, Nord-Livland und Oesel