Parmacella gervaisii is an extinct 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 Parmacellidae

Parmacellidae

Parmacellidae is a family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks within the superfamily Parmacelloidea ....

.

Parmacella gervaisii is considered to be extinct.

Distribution

This species was endemic to the area near Arles

Arles

Arles is a city and commune in the south of France, in the Bouches-du-Rhône department, of which it is a subprefecture, in the former province of Provence....

, France.

Description

The animal is brown with olive green hue. The shell

Gastropod shell

The gastropod shell is a shell which is part of the body of a gastropod or snail, one kind of mollusc. The gastropod shell is an external skeleton or exoskeleton, which serves not only for muscle attachment, but also for protection from predators and from mechanical damage...

 is solid, greenish yellow, shiny, entirely opaque, concentrically striated, with 1.25 whorls

Whorl (mollusc)

A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the...

, anterior part is 3 times larger than posterior part, rounded. The length of the shell is 11–12 mm. The width of the shell is 7 mm. The height of the shell is 2-2.3 mm.

External links

text about Parmacella gervaisii in French, but the image is drawing of the Parmacella valenciennii

Parmacella valenciennii

Parmacella valenciennii is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Parmacellidae.- Distribution :The distribution of Parmacella valenciennii includes:...