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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 ...
Four views of a shell of Arianta arbustorum: Apertural view (top left), lateral view (top right), apical view (bottom left), and umbilical view (bottom right). The gastropod shell is part of the body of a gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but ...
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 ...
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.
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 ...
Lamarck, 1801 [1] vide Meek, 1876 [2] Species. See text. Baculites is an extinct genus of heteromorph ammonite cephalopods with almost straight shells. The genus, which lived worldwide throughout most of the Late Cretaceous, and which briefly survived the K-Pg mass extinction event, was named by Lamarck in 1799. [3][4]
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 ...
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 ...