Alcyna australis
From Wikipedia, the free encyclopedia
| Alcyna australis | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Trochidae |
| Genus: | Alcyna |
| Species: | A. australis |
| Binomial name | |
| Alcyna australis Hedley, 1907 | |
Alcyna australis is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[1]
The size of the shell varies between 1.8 mm and 2.5 mm. The small shell has a broadly conical shape. The 4½ whorls are rounded and increase rapidly in size.
Colour: adult whorls dull white, protoconch dark purple.
Sculpture: the base is ornamented with spaced spiral grooves. These occur, but fainter, on the penultimate whorl. The protoconch, embracing 2½ whorls, is more strongly spirally furrowed. The large aperture is round. Into it projects from the columella a prominent tooth-like tubercle. The contrast in colour and sculpture between the apical and succeeding whorls distinguishes this species.[2]