''Bolma bartschii'' , common name Bartsch's star bolma, is a
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
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)
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* Marine debris
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* Marine life
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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
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...
in the
family
Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...
Turbinidae, the turban snails.
[Gofas, S. (2012). ''Bolma bartschii'' Dall, 1913. Accessed through: ]World Register of Marine Species
The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms.
Content
The content of the registry is edited and maintained by scientific specialist ...
at http://www.marinespecies.org/aphia.php?p=taxdetails&id=555217 on 2012-09-01
Description
(Original description by
W.H. Dall
William Healey Dall (August 21, 1845 – March 27, 1927) was an American naturalist, a prominent malacologist, and one of the earliest scientific explorers of interior Alaska. He described many mollusks of the Pacific Northwest of America, and w ...
) The size of the shell varies between 12 mm and 50 mm. The thin, trochoid shell is yellowish white with rose-colored flammules and nebulosities, with more or less articulation on the spiral ridges. The glassy nucleus is very minute. The nepionic shell (i.e. the
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 immediately following the embryonic whorls) are white, depressed above, of three rather rounded whorls with numerous low radial plications or riblets. The subsequent whorls number four, with a sparsely imbricate keel at the periphery and a prominent, beaded, spiral cord one-third of the way from the appressed posterior
suture toward the periphery. This arrangement gives a channeled or