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Theta Spicea
''Theta spicea'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Raphitomidae.MolluscaBase eds. (2020). MolluscaBase. Theta spicea (R. B. Watson, 1881). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=533494 on 2020-04-09 Description The length of the shell attains 6.4 mm. (Original description) The shell is short and broad, biconical, scalar, angulated, without ribs, but with tubercles at the angle, and feeble spiral threads on the base. The siphonal canal is small and lop-sided. Sculpture (mollusc), Sculpture: ''Longitudinals''— there are none but very fine, unequal, hairlike lines of growth. ''Spirals'' —immediately below the suture is a minute collar of very small, high, round, remote tubercles, whose sutural surface at right angles to the axis is perfectly flat. This collar is strongest on the earlier Whorl (mollusc), whorls. Below this is a sloping, flat, or slightly c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
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. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists 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. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
