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Botelloides Bassianus
''Botelloides bassianus'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.Rosenberg, G. (2012). ''Botelloides bassianus''. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=594500 on 2012-11-23 ;Subspecies: * ''Botelloides bassianus bassianus'' (Hedley, 1911) (synonyms: ''Rissoa (Onoba) glomerosa'' Gatliff & Gabriel, 1908; ''Rissoa (Onoba) bassiana'' Hedley, 1911) * ''Botelloides bassianus borda'' Cotton, 1944 (synonym: ''Botelloides borda'' Cotton, 1944) Description The height of the shell attains 4.5 mm, its diameter 2 mm. The solid, oblong shell has a subcylindrical shape. It is rounded at each extremity. Colour: the upper part of each whorl is dull white, the lower slate-purple, the anterior extremity is again dull white, the dark band on the median third of the body whorl The body whorl is part of the morphology of the shell in those gastropod mollu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sculpture (mollusc)
Sculpture is a feature of many of the shells of mollusks. It is three-dimensional ornamentation on the outer surface of the shell, as distinct from either the basic shape of the shell itself or the pattern of colouration, if any. Sculpture is a feature found in the shells of gastropods, bivalves, and scaphopods. The word "sculpture" is also applied to surface features of the aptychus of ammonites, and to the outer surface of some calcareous opercula of marine gastropods such as some species in the family Trochidae. Sculpture can be concave or convex, incised into the surface or raised from it. Sometimes the sculpture has microscopic detailing. The term "sculpture" refers only to the calcareous outer layer of shell, and does not include the proteinaceous periostracum, which is in some cases textured even when the underlying shell surface is smooth. In many taxa, there is no sculpture on the shell surface at all, apart from the presence of fine growth lines. The sculpture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Botelloides
''Botelloides'' is a genus of sea snails, marine (ocean), marine gastropod mollusks in the family (biology), family Trochidae, the top snails.Rosenberg, G.; Bouchet, P. (2012). ''Botelloides'' Strand, 1928. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=512295 on 2012-11-23 Description The general characteristics of the species in this genus are: * the shell is subcylindrical and pupoid in shape * the Whorl (mollusc), whorls wind obliquely on the last two-thirds of the shell * Sculpture (mollusc), sculpture: the earlier whorls are smooth, the later ones bear fine incised, spiral grooves * the shape of the Aperture (mollusc), aperture is pyriform to circular * the Columella (gastropod), columella is excavate * the outer Lip (gastropod), lip is grooved within and bevelled to a sharp edge Differences between the species are defined by the shell gradually widening towards the body whorl, or the shell not widening but is cy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
