|
Gibbula Hera
''Gibbula hera'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Description The height of the shell attains 5.6 mm, its diameter 7.3 mm. The shell is subglobose. It is very dark brown, mottled and streaked with yellow horn color. The 2½ nuclear whorls are well rounded and smooth. The 2⅛ postnuclear whorls are well rounded and decidedly shouldered at the summit. They are marked between this and the suture by broad, depressed, spiral cords, of which five occur upon the first, six upon the second, while the body whorl has eight, owing to splitting of the primary cords. The spaces that separate the cords are less than one-half the width of the cords and are very feebly impressed. In addition to the above sculpture the spire is marked with feeble, decidedly retractive lines of growth which pass over the cords and grooves. The periphery of the body whorl is subangulated, marked by a slender spiral cord. by six, narrow ... [...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] |
