Gastropod anatomy

thumb|A slug on a wall in Kanagawa Prefecture|Kanagawa, [[Japan.]]

thin-walled expanded portion of the alimentary tract used for the storage of food prior to digestion

The radula (; : radulae or radulas) is an anatomical structure found in most mollusks, serving as their primary feeding tool. Often compared to a tongue, this minutely toothed, chitinous ribbon typically functions by scraping or cutting food before it enters the esophagus. Mollusks in every class possess a radula, except for bivalves, which instead employ waving cilia to draw in minute organisms for feeding.

thumb|9 day old veliger of the nudibranch Tritonia diomedea with various organs and structures labeled. Larval size about 200 um on its long axis. thumb|Veliger of sea hare [[Dolabrifera dolabrifera, with two rows of cilia visible]]

anatomical structure which is part of the body of some aquatic molluscs

hard structure which closes the aperture of a gastropod when the animal retreats into the shell

darts that some snails shoot into each other during mating

thumb|Specimen of the annelid, Lepidonotus|Lepidonotus oculatus, with a microscope image of one of its parapodia (inset). [[Museums Victoria specimen.]] In invertebrates, the term parapodium (Gr. para, beyond or beside + podia, feet; : parapodia) refers to lateral outgrowths or protrusions from the body. Parapodia are predominantly found in annelids, where they are paired, unjointed lateral outgrowths that bear the chaetae. In several groups of sea snails and sea slugs, 'parapodium' refers to lateral fleshy protrusions. __TOC__

The hepatopancreas, digestive gland or midgut gland is an organ of the digestive tract of arthropods and molluscs. It provides the functions which in mammals are provided separately by the liver and pancreas, including the production of digestive enzymes, and absorption of digested food.

right|thumb|upright=2.5|A diagram of a hypothetical ancestral mollusc (HAM) with osphradia indicated on the far right side of the image inside the posterior mantle cavity The osphradium is a pigmented chemosensory epithelium patch in the mantle cavity present in six of the eight extant classes of molluscs (it is absent in the Scaphopoda and Monoplacophora; most Cephalopoda also lack it, but the nautilus has what appears to be a set of osphradia), on or adjacent to the ctenidia (gills). The main function of this organ is disputed but it is believed to be used to test incoming water for silt and

part of the body of a gastropod or snail

thumb|A pair of rhinophores on the head of Goniobranchus coi

respiratory organ or gill which is found in many mollusks

thumb|right|Propodeum labelled within the alitrunk of an ant worker

300px|thumb|right|Helix pomatia using a simple transparent epiphragm made of dried mucus

gastropod anatomy

thumb|Arion vulgaris opening its pneumostome thumb| An individual Arion rufus with the pneumostome wide open thumb|Drawing showing the different external anatomical features of a slug thumb|right|Open and closed pneumostome thumb|The pneumostome of Triboniophorus graeffei is on its dorsal surface. The pneumostome or breathing pore is a respiratory opening of the external body anatomy of a pulmonate land slug or land snail. It is a part of the respiratory system of gastropods.

The tortrix moth genus Cerata is considered a junior synonym of Cydia. thumb|300px|Detail of the aeolid nudibranch Flabellina aff. lineata showing the cerata and cnidosacs. thumb|Drawing of cerata of Fiona pinnata. There are small efferent vessels in cerata with puckered membranous fringe on the inner sides. The vessels are leading to the great median trunk. Cerata, singular ceras, are anatomical structures found externally in nudibranch sea slugs, especially in aeolid nudibranchs, marine opisthobranch gastropod mollusks in the clade Aeolidida. The word ceras comes from the Greek word κέρας (k

mucus produced by gastropods

The clausilium is a calcareous anatomical structure which is found in one group of air-breathing land snails: terrestrial pulmonate gastropod mollusks in the family Clausiliidae, the door snails. The clausilium is one part of the clausilial apparatus.

anatomical structure of certain sea snails

thumb|Side and top view of a Cryptella canariensis from the Canary Islands thumb|Shell of Cryptella canariensis thumb|An unidentified semi-slug from List of non-marine molluscs of Uganda|Uganda