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The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top .
Turbinate – Having the form of a top. [1] Turriculated – Having the form of a tower. [1] Turreted – Having the form of a tower. [1] Umbilicated – Having an opening in the base of the shell. [1] Undulated – Having undulations or waves. [1] Univalve – Having the shell composed of a single piece, as a snail. [1] Varicose – Swollen or ...
Freshwater snails are gastropod mollusks that live in fresh water. There are many different families. 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 anatomy of a common air-breathing land snail: much of this anatomy does not apply to gastropods in other clades or groups. 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 ...
Neritidae, common name the nerites, is a taxonomic family of small to medium-sized saltwater and freshwater snails which have a gill and a distinctive operculum. [2] The family Neritidae includes marine genera such as Nerita, marine and freshwater genera such as Neritina, and freshwater and brackish water genera such as Theodoxus.
Some gastropods, for example the freshwater apple snails (family Ampullariidae) [7] and marine species of genus Strombus [8] can completely regenerate their eyes. The gastropods in both of these families have lens eyes. Morphological sequence of different types of multicellular eyes exemplified by gastropod eyes: [9]
These land snails have opercula, which helps identify them as "winkles gone ashore", in other words, snails within the clade Littorinimorpha and the informal group Architaenioglossa. Members of the snail family Pulmonata , which includes carboniferous land sails and some freshwater snails of the order Basommatophora , are protandrous ...
These snails are sometimes viewed as pests in aquarium tanks with fish, because the snails create waste, reproduce very often, and are very hard to remove completely. However, some aquarium owners deliberately choose to add these freshwater pond snails to their tank because the snails will eat uneaten fish food, algae and waste, as well as ...