''Sukashitrochus atkinsoni'' is a
species of minute
sea snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...
, a
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
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* ...
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
mollusk or
micromollusk
A micromollusk is a shelled mollusk which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine mollusks, although in addition, numerous species of land snails and freshwater mollusks also ...
in the
family Scissurellidae, the little slit snails.
[Bouchet, P. (2013). ''Sukashitrochus atkinsoni''. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492828 on 2013-02-16]
Description
The minute, brown shell attains a height of 2 mm. It has a globose-depressed shape. The
spire is short, low, and blunt. The three
whorl
A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs).
Whorls in nature
File:Photograph and axial plane floral ...
s widen rapidly and are plane above. The last whorl descends very deeply toward the
aperture, with a strong keel at the
shoulder, occupied by the anal fasciole, and another keel at the periphery, the space between them concave. Below this carina there are about 3 rather
separated spiral lira, and around the
umbilicus three more. The keels are obsolete for a short distance behind the aperture. The fine growth striae are scarcely perceptible. The slit fasciole present on the last 1½ whorls is very narrow. Its edgesare pinched up into a strong keel. It terminates about ½ mm or ¾ mm behind the
peristome in a long, narrow slot. The ovate
aperture is very oblique. It is narrowed above. The
columella is slightly arcuate, and nearly vertical. The umbilicus is narrowly perforated, funnel-shaped, and smooth inside. On old shells the median carina becomes rounded on the last ¾ whorl, and there are numerous spiral riblets both above and below the slit fasciole.
G.W. Tryon (1890), Manual of Conchology vol. XII
/ref>
Distribution
This marine species occurs off Queensland to South Australia and Western Australia; off Tasmania.
References
External links
Encyclopedia of Life
World Register of Marine Species
{{Taxonbar, from=Q7635729
Scissurellidae
Gastropods described in 1877