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Cylindrus obtusus. (Draparnaud, 1805) [2] Cylindrus obtusus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Helicidae, the typical snails. This species is endemic to Austria. It lives on certain mountain tops in the Eastern Alps, in limestone habitats, e.g. the Dürrnstein, Ötscher and Gesäuse ...
Siphonal canal. A shell of Penion cuvieranus cuvieranus, with the long siphonal canal visible extending toward the bottom of the image, at the anterior end of the shell. The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular ...
Reproductive system of gastropods. Entwined everted penises of a pair of mating hermaphrodite slugs in the species Limax maximus. The reproductive system of gastropods (slugs and snails) varies greatly from one group to another within this very large and diverse taxonomic class of animals. Their reproductive strategies also vary greatly.
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. The operculum (from Latin operculum '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 ...
Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks[ a ] (/ ˈmɒləsks /). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. [ 4 ] The number of additional fossil species is estimated between 60,000 and 100,000, [ 5 ] and ...
The columella (meaning "little column") or (in older texts) pillar is a central anatomical feature of a coiled snail shell, a gastropod shell. The columella is often only clearly visible as a structure when the shell is broken, sliced in half vertically, or viewed as an X-ray image. The columella runs from the apex of the shell to the midpoint ...
Binomial name. Cerithidea obtusa. (Lamarck, 1822) Synonyms [1] Potamides obtusus (Lamarck, 1822) Cerithidea obtusa is a species of sea snail, a marine gastropod mollusk in the family Potamididae. [1] The Obtuse Horn Shell, also known as Mud Creeper, is a relatively common snail found in muddy coastal areas. It grows to around 5–6 cm.
Umbilicus (mollusc) The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) side of many (but not all) snail shells, including some species of sea snails ...