Achatinella sowerbyana is a species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of air-breathing land snail

Land snail

A land snail is any of the many species of snail that live on land, as opposed to those that live in salt water and fresh water. Land snails are terrestrial gastropod mollusks that have shells, It is not always an easy matter to say which species are terrestrial, because some are more or less...

, a terrestrial

Terrestrial animal

Terrestrial animals are animals that live predominantly or entirely on land , as compared with aquatic animals, which live predominantly or entirely in the water , or amphibians, which rely on a combination of aquatic and terrestrial habitats...

 pulmonate gastropod mollusk in the family Achatinellidae

Achatinellidae

Achatinellidae is a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Achatinelloidea.- Taxonomy :...

. This species is endemic to Hawaii.

Shell description

The sinistral or dextral shell is imperforate, conic-oblong and solid. The shell has 6 whorls. The spire is slightly convexly-conic and the apex subacute. The suture is margined and the whorls are slightly convex. The glossy color is tawny buff and slightly streaked with a deeper shade. The aperture is oblique and white within. The strong columellar fold is superior, twisted, and roseate. The peristome is rose-lipped with the outer margin
shortly expanded and columellar margin dilated and adnate.

The height of the shell is 18.0 mm. The width of the shell is 9.0 mm.