| 词条 | Alcyna australis |
| 释义 |
| taxon = Alcyna australis | image = | image_caption = | authority = Hedley, 1907 | synonyms_ref = | synonyms = | display_parents = 3 }}Alcyna australis is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[1] DescriptionThe 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] DistributionThis marine species is endemic to Australia and occurs off Queensland, West Australia Tasmania and in the Timor Sea. References1. ^Marshall, B. (2013). Alcyna australis Hedley, 1907. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=720349 on 2014-01-07 2. ^[https://archive.org/details/proceedingsoflin32linn Charles Hedley, The Mollusca of Mast Head Reef, Capricorn Group, Queensland. Part II; Proceedings of the Linnean Society of New South Wales v. 32 (1907)]
External links
3 : Alcyna|Gastropods of Australia|Gastropods described in 1907 |
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