Sinployea decorticata

Sinployea decorticata a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Charopidae. This species was endemic to the Cook Islands; it is now extinct.

Shell description
Sinployea decorticata was originally discovered and described under the name Pitys decorticata by American naturalist Andrew Garrett in 1872.

Garrett's original text (the type description) reads as follows:

Shell subdiscoid, openly umbilicate, thin, subpellucid, cinereous, under a brownish horn-colored epidermis, adults decorticated, rarely with radiating dashes of reddish brown, arcuately ribbed, ribs lamellar, regular, rather closely set, continued on the base, interstices very finely striated; spire flatly convex; suture channeled; whorls 5, convex, slowly increasing, last one convexly declivous above, rounded beneath, obsoletely angular on the periphery; umbilicus deep, exposing the whorls, about a fourth the diameter of the shell; aperture oblique, orbicular luniform; peristome thin, simple; parietal region very thinly callosed.

The width of the shell is 4 mm. The height of the shell is 2 mm.

Type specimen are stored in the collection of Academy of Natural Sciences in Philadelphia.

Distribution
Type locality is Rarotonga Island, Cook Islands.

Habitat
Andrew Garrett commented on the habitat of this land snail, saying it was, "a common species found on the ground in a mountain ravine".