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A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name snail is also used for most of the members of the molluscan class Gastropoda that have a coiled shell that is large enough for the animal to retract completely into. When the word "snail" is used in this most general sense, it includes not just land snails but also numerous species of sea snails and freshwater snails. Gastropods that naturally lack a shell, or have only an internal shell, are mostly called slugs, and land snails that have only a very small shell are often called semi-slugs.
The gastropods, commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda.
Nudibranchs are a group of soft-bodied, marine gastropod molluscs which shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to match, such as "clown," "marigold," "splendid," "dancer," "dragon," or "sea rabbit." Currently, about 3,000 valid species of nudibranchs are known.
Henderson Island is an uninhabited island in the south Pacific Ocean. With Pitcairn, Oeno and Ducie Islands it forms the Pitcairn Island Group.
Pyramidellidae, common name the pyram family, or pyramid shells, is a voluminous taxonomic family of mostly small and minute ectoparasitic sea snails, marine heterobranch gastropod molluscs. The great majority of species of pyrams are micromolluscs.
The white abalone, scientific name Haliotis sorenseni, is a species of large sea snail, a marine gastropod mollusk in the family Haliotidae, the abalones.
The gastropod shell is part of the body of a gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or the shell is reduced such that the body cannot be retracted within (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. An excellent source for terminology of the gastropod shell is "How to Know the Eastern Land Snails" by John B. Burch now freely available at the Hathi Trust Digital Library.
Partulidae is a family of air-breathing land snails, terrestrial gastropod mollusks in the superfamily Partuloidea. The family is endemic to Pacific islands.
Bithynia pauli is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusc in the family Bithyniidae.
Bithynia canyamelensis is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusc in the family Bithyniidae.
Bithynia riddifordi is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusc in the family Bithyniidae.
Bithynia manonellesi is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusc in the family Bithyniidae.
Laevistrombus canarium is a species of edible sea snail, a marine gastropod mollusc in the family Strombidae. Known from illustrations in books dating from the late 17th century, L. canarium is an Indo-Pacific species occurring from India and Sri Lanka to Melanesia, Australia and southern Japan. The shell of adult individuals is coloured from light yellowish-brown to golden to grey. It has a characteristic inflated body whorl, a flared, thick outer lip, and a shallow stromboid notch. The shell is valued as an ornament, and because it is heavy and compact, it is also often used as a sinker for fishing nets.
Pachychilidae, common name pachychilids, is a taxonomic family of freshwater snails, gastropod molluscs in the clade Sorbeoconcha.
Coralliophilinae is a taxonomic group, a subfamily of about 200–250 sea snails, marine gastropod mollusks commonly known as the coral snails or coral shells. This is a subfamily within the very large family Muricidae, the murex or rock snails.
Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs to major rivers. The great majority of freshwater gastropods have a shell, with very few exceptions. Some groups of snails that live in freshwater respire using gills, whereas other groups need to reach the surface to breathe air. In addition, some are amphibious and have both gills and a lung. Most feed on algae, but many are detritivores and some are filter feeders.
Conus havanensis is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.
Sarasinula plebeia, commonly called the bean slug or the Caribbean leatherleaf slug, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Veronicellidae, the leatherleaf slugs.
Panulirus pascuensis is a species of spiny lobster found around Easter Island and the Pitcairn Islands in the Pacific Ocean. It is known in English as the Easter Island spiny lobster and in Spanish as Langosta de Isla de Pascua. This lobster is fished on a small scale for local consumption.
Cheilea equestris is a species of small limpet-like sea snail, a marine gastropod mollusk in the family Hipponicidae, the hoof snails.
References
- ↑ (in Spanish) Altaba C. R.. 25 June 2007. Catàleg dels gasteròpodes d’aigua dolça de les Illes Balears, amb descripció de 10 espècies noves. Checklist of freshwater gastropods of the Balearic Islands, with the description of 10 new species. Malacofauna Balearica, 1 Archived 2008-11-13 at the Wayback Machine : 23-38, Palma de Mallorca.
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