Amastra conica is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.
Subspecies Amastra conica conica Baldwin, 1906 Amastra conica gentilis C. M. Cooke, 1917 Amastra conica gyrans Hyatt, 1911 Amastra conica kohalensis Hyatt & Pilsbry, 1911
Description The length of the shell attains 15.5 mm, its diameter 8 mm.
(Later supplemental description by Hyatt, A. & Pilsbry, H. A.) The shell is a fossil specimen. It is dextral and minutely perforated, with a thin, elongately conical shape and an acute apex. Its surface is delicately sculpted with fine growth lines, while the apical whorls exhibit radiating sulcations. The original coloration of the living shell remains unknown. Comprising seven convex whorls, the shell features a well-defined suture. The aperture is oblique and oval, framed by a simple, very thin peristome. The columella ends in a subtly developed fold.
The species was discovered within deposits of fossilized shells at a location known as Mana. The likelihood of living specimens of this species persisting to the present day or within any recent period is exceedingly low.
Distribution This species is endemic to Hawaii, occurring on the Lanai island.
References