''Ethminolia stearnsii'' 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
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. (2020). MolluscaBase. Ethminolia stearnsii (Pilsbry, 1895). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=298157 on 2020-11-07]
Description
The shell of an adult varies between 3.5 mm and 10 mm. The shell is more depressed than ''
Ethminolia vitiliginea
''Ethminolia vitiliginea'', common name the depressed top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Description
The size of an adult shell varies between 7 mm and 11 mm. The ...
''
(Menke, 1843). It is thin, shining and widely umbilicate. Its color pattern is densely and finely radially vermiculate with olivaceous on a pale ground above, usually with few or many radial dark clouds below the
suture, and several narrow articulated, spaced spiral lines. The periphery is lighter, often spotted. The base of the shell shows a paler vermiculate and articulated pattern. The surface is closely and evenly sculptured with spiral striae throughout, with inconspicuous rather spaced oblique impressed lines, and between them very faint, close growth-striae which slightly crenulate the spirals. The five
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 very convex, rather flattened below the sutures, and produce a blunt median angle on the whorls of the
spire. The
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 subangular at the periphery and around the
umbilicus. The latter is funnel-shaped, one-fourth the total diameter of the shell, white within and with distinct growth lines. The oblique
aperture is roundly subquadrate. The
columella is slightly dilated above, straight in the middle, and bluntly angular at base.
H. Pilsbry (1895), Catalogue of the marine mollusks of Japan
(described as ''Minolia stearnsii'')
Distribution
This species occurs in the Pacific Ocean off the Philippines and Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
.
References
* Herbert D.G. (1992). ''Revision of the Umboniinae (Mollusca: Prosobranchia: Trochidae) in southern Africa and Mozambique''. Annals of the Natal Museum 33(2):379-459.
* 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. page(s): 112
External links
*
{{DEFAULTSORT:Ethminolia Stearnsii
stearnsii
Gastropods described in 1895