Parietal is an adjective used predominantly for the parietal lobe and other relevant anatomy
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc.
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 also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or the shell is reduced such that the body cannot be retracted within (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. An excellent source for terminology of the gastropod shell is "How to Know the Eastern Land Snails" by John B. Burch now freely available at the Hathi Trust Digital Library.
Extra extra or Marginella extra is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Cystiscidae. Some malacologists place this genus more simply in the family Marginellidae.
The columella or 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.
Vertigo ronnebyensis is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.
Acicula fusca is a species of land snail in the family Aciculidae. It is known by the common name point snail. It is native to Europe, where it occurs in Britain, Ireland, France south to the Basses Pyrénées, Spain, Belgium, and north-west Germany. Commonest in the west. The distribution type is Oceanic Temperate.
Fenimorea janetae, common name Janet's turrid, is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.
Phasianella variegata, common name the variegated pheasant, is a species of sea snail, a marine gastropod mollusk in the family Phasianellidae.
Turbo imperialis is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.
Eostrobilops hirasei is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Strobilopsidae.
Turbo heterocheilus is a species of sea snail, marine gastropod mollusk in the family Turbinidae.
In the shell of gastropod mollusks, the lip is the free margin of the peristome or aperture of the gastropod shell.
A callus is an anatomical feature that exists in some mollusk shells, a thickened area of shell material that can partly or completely cover the umbilicus, or can be located as a coating on the body whorl near the aperture of the shell.
Turbonilla juani is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.
Chrysostoma is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.
Prothalotia pulcherrima, common name the beautiful jewel top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Gudeodiscus messageri is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Plectopylidae.
Halongella schlumbergeri is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Plectopylidae.
Mangelia china is an extinct species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
