Uvanilla Olivacea on:
[Wikipedia]
[Google]
[Amazon]
''Uvanilla olivacea'', common name the blood-spotted star shell, is a species of
The acute, imperforate shell has a conic shape. Its color pattern is olive-green or brownish. The 6–7 whorls are slightly convex, obliquely finely striate, longitudinally finely plicate. The folds stand at right angles to the striae, and are interrupted one-third of the distance from the suture to the periphery by two spiral impressed furrows. The linear suture is undulating. The peripheral carina is slightly nodose. The base of the shell is concave, radiately finely lamellose striate,
with a somewhat nodulose rib revolving midway between the periphery and the center. The oblique aperture is silvery white within. it is angled and channelled at its outer side. The base is nearly straight. The arched columella is deeply excavated at the position of the umbilicus. The whole umbilical area is brilliant vermilion, with a black spiral rib.
The oval operculum is black to yellowish inside, with a marginal apex, frequently concealed by growth of the last whorl. Its white outer surface is strongly bicostate.G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia
(described as ''Astralium olicaceum'')
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 Turbinidae, the turban snails.
Distribution
This species is found fromLa Paz
La Paz (), officially known as Nuestra Señora de La Paz (Spanish pronunciation: ), is the seat of government of the Bolivia, Plurinational State of Bolivia. With an estimated 816,044 residents as of 2020, La Paz is the List of Bolivian cities ...
in the Gulf of California southwards to Oaxaca, in Mexico.Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064, at p. 356.
Description
The shell is greenish brown and roughly an equilateral triangle in profile with a slightly wavy thickened edge on the bottom of thewhorl
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 ...
and sculpture consisting of fine diagonal spiral ridges. The single most striking feature is a brilliant spot of reddish-orange at the base of the umbilical pit which is bordered by a dark brown to black outer edge. Average height is 55 mm, and average diameter is 65 mm.
The acute, imperforate shell has a conic shape. Its color pattern is olive-green or brownish. The 6–7 whorls are slightly convex, obliquely finely striate, longitudinally finely plicate. The folds stand at right angles to the striae, and are interrupted one-third of the distance from the suture to the periphery by two spiral impressed furrows. The linear suture is undulating. The peripheral carina is slightly nodose. The base of the shell is concave, radiately finely lamellose striate,
with a somewhat nodulose rib revolving midway between the periphery and the center. The oblique aperture is silvery white within. it is angled and channelled at its outer side. The base is nearly straight. The arched columella is deeply excavated at the position of the umbilicus. The whole umbilical area is brilliant vermilion, with a black spiral rib.
The oval operculum is black to yellowish inside, with a marginal apex, frequently concealed by growth of the last whorl. Its white outer surface is strongly bicostate.(described as ''Astralium olicaceum'')
Habitat
This sea snail is found intertidally and in shallow water offshore in rocky areas.References
External links
* {{Taxonbar, from=Q7903631 olivacea Gastropods described in 1828 Taxa named by William Wood (zoologist)