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Gastropods have the greatest numbers of named mollusk species. However, estimates of the total number of gastropod species vary widely, depending on cited sources. The number of gastropod species can be ascertained from estimates of the number of described species of Mollusca with accepted names: about 85,000 (minimum 50,000, maximum 120,000). [9]
Gastropod shell, operculum, radula, love dart, clausilium. Anatomy by systems; Digestive system of gastropods, respiratory system of gastropods, circulatory system of gastropods, excretory system of gastropods, sensory organs of gastropods, nervous system of gastropods, reproductive system of gastropods. The current taxonomy
List of gastropods described in 2013 - 2013 in paleomalacology#Gastropods; List of gastropods described in 2014 - 2014 in molluscan paleontology#Newly named gastropods; List of gastropods described in 2015 - 2015 in molluscan paleontology#Gastropods; List of gastropods described in 2016 - 2016 in molluscan paleontology#Gastropods
Juliidae, common name the bivalved gastropods, is a family of small sea snails, marine gastropod mollusks or micromollusks in the superfamily Oxynooidea, an opisthobranch group. [ 2 ] These are sacoglossan (sap-sucking) sea snails, and many of them are green in color.
Helix is a genus of large, air-breathing land snails native to the western Palaearctic and characterized by a globular shell. [1] [2]It is the type genus of the family Helicidae, and one of the animal genera described by Carl Linnaeus [3] at the dawn of the zoological nomenclature.
In the most primitive gastropods, however, the stomach is a more complex structure. In these species, the hind part of the stomach, where the oesophagus enters, is chitinous, and includes a sorting region lined with cilia. [1] In all gastropods, the portion of the stomach furthest from the oesophagus, called the "style sac", is lined with cilia.
Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
The scaly-foot gastropod is an obligate symbiotroph throughout post-settlement life. [24] Throughout its post-larval life, the scaly-foot gastropod obtains all of its nutrition from the chemoautotrophy of its endosymbiotic bacteria. [26] [24] The scaly-foot gastropod is neither a filter-feeder [5] [24] nor uses other mechanisms for feeding. [5]