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Pulmonate land snails usually have two sets of tentacles on their head: the upper pair have an eye at the end; the lower pair are for olfaction. [1]In anatomy, an eyestalk (sometimes spelled eye stalk and also known as an ommatophore) is a protrusion that extends an eye away from the body, giving the eye a better field of view. [1]
Pulmonata or pulmonates is an informal group (previously an order, and before that, a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group includes many land and freshwater families, and several marine families.
Stylommatophora is the most diverse group of land snails and slugs. Pallial cavity forms a spacious, air-filled lung. Anus is located on the right side close to the pneumostome. Operculum is missing. Two pairs of tentacle are retractable and the posterior pair bears eyes on the tips. Radula typically has many small, quite uniform teeth per row.
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In this image of an individual of Cepaea nemoralis, a pulmonate land snail, the pallial lung is visible through the translucent shell as the brightest yellow part of the body whorl The pulmonates have lost their gills [ 1 ] and adapted the mantle cavity into a pallial lung .
Quantula striata, also known as Dyakia striata, is a species of medium-sized, air-breathing, tropical land snail. It is a terrestrial , pulmonate , gastropod mollusk in the family Dyakiidae . This species appears to be unique among terrestrial gastropods in that it is bioluminescent : Its eggs glow in the dark, and juveniles and most adults ...