gastropoda |
english |
Difino
| • | Subclass Eogastropoda PatellogastropodaSubclass Orthogastropoda Superorder Coculiniformia Superorder Hot Vent Taxa Neomphaolida Superorder Vetigastropoda Superorder Neritaemorphi Neritopsina Superorder Caenogastropoda Architaenioglossa Sorbeoconcha Superorder Heterobranchia Heterostropha Opisthobranchia Pulmonata The gastropods, gasteropods, or univalves, are the largest and most successful class of mollusks, with 60,000-75,000 extant species known, comprising the snails and slugs as well as a vast number of marine and freshwater species. They typically have a well-defined head with two or four sensory tentacles, and a ventral foot, which gives them their name (Greek gaster, stomach, and poda, feet). They are distinguished by torsion, a process where the body coils to one side during development. Most members have a shell, which is in one piece and typically coiled or spiralled that usually opens on the right hand side (as viewed with the shell apex pointing upward). Several species have an operculum that operates as a trapdoor to close the shell. This is usually made of a horny material, but in some molluscs it is calcareous. In some members, the slugs, the shell is reduced or absent, and the body is streamlined so its torsion is relatively inconspicuous. While the best-known gastropods are terrestrial, more than two thirds of all species live in a marine environment. Marine gastropods include herbivores, detritus feeders, Source: [wikipedia: gastropoda] |
mollusca:animalia
| Eurasia Shells | ||
| large collection of gastropod specimen images (over 900 species) from the philippines, rarely represented in the literature. | ||
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