''Tosatrochus attenuatus'' is a
species of
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
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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 in the
family Trochidae, the top snails.
[MolluscaBase eds. (2022). MolluscaBase. Tosatrochus attenuatus (Jonas, 1844). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=547324 on 2022-09-24]
Description
The height of the shell varies between 25 mm and 30 mm. The thick, imperforate or very narrowly perforate shell has a conic-elongated shape. It is whitish, ornamented with radiating livid-brown flammules, brown punctulate. The 9
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 are convex, spirally lirate (the lirae unequal) and longitudinally nodose-costate, the nodules more prominent below. The
sutures are impressed. The angulated
body whorl
The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk.
In gastropods
In gastropods, the b ...
is depressed beneath the sutures and nodulous at the periphery. It is very convex and with about 8 concentric lirae beneath, the interstices with intercalated lirulae. The
aperture is subquadrate and canaliculate within. The basal margin is arcuate and plicate. The
columella is subangular, concave, strongly truncate at base, with a short callus over the
umbilicus.
Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
(described as ''Cantharidus elongatus'')
Distribution
This marine species occurs off the South Australia, Western Australia and the Western Pacific.
References
* Wood, Ind. Test. Suppl. pi. 5. f. 19
* Kuroda T. & Habe T. 1952. Check list and bibliography of the Recent marine Mollusca of Japan. Leo W. Stach, Tokyo. 210 pp
* Poppe G.T., Tagaro S.P. & Dekker H. (2006) The Seguenziidae, Chilodontidae, Trochidae, Calliostomatidae and Solariellidae of the Philippine Islands. Visaya Supplement 2: 1-228.
External links
The PIisbry Quarterly Devoted to the Interests of Conchologists; The Nautilus v.72 (1958-1959)
Jonas, J. H. (1844). Neue Trochoideen. Zeitschrift für Malakozoologie. 1: 167-172
Wood, W. (1828). Supplement to the Index Testaceologicus; or A catalogue of Shells, British and Foreign. Richard Taylor, London. Iv 1">Wood, W. (1828). Supplement to the Index Testaceologicus; or A catalogue of Shells, British and Foreign. Richard Taylor, London. Iv from2=Q16994504">from1=Q7827557
Tosatrochus, attenuatus
Gastropods described in 1844