Umbonium conicum | |
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Drawing with two views of a shell of Umbonium conicum | |
Scientific classification ![]() | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Clade: | Vetigastropoda |
Order: | Trochida |
Superfamily: | Trochoidea |
Family: | Trochidae |
Genus: | Umbonium |
Species: | U. conicum |
Binomial name | |
Umbonium conicum (A. Adams & Reeve, 1850) | |
Synonyms | |
Rotella conica A. Adams & Reeve, 1850 |
Umbonium conicum is a species of very small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. [1]
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.
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 absence of a visible shell.
Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".
The height of the shell attains 5 mm, its diameter 7 mm. The polished, smooth, thin but solid shell has a conic shape with a flat base. Its color pattern is dark purple, unicolored with a reddish apex, or with an opaque white band on the lower part of each whorl, or with the entire upper surface of the two outer whorls white, the base purple. The conical spire has straight lateral outlines. The six whorls are rather slowly widening. The body whorl is rounded at the periphery, flat below, or a trifle concave around the rather small, circular, dark central callus. The aperture is subquadrate and iridescent inside. The short columella is oblique, very thick and heavy, with a little nick in the edge near its base, and a slight notch where it is inserted upon the basal callus pad.
In anatomy, an apex is part of the shell of a mollusk. The apex is the pointed tip of the shell of a gastropod, scaphopod, or cephalopod.
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the ammonites.
A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods.
The coloration is peculiar ; a beautiful iridescence glows through the purplish outer coat of the upper whorls. The conical form, flat base, and peculiarly nicked columella, together with the polished surface, smooth except for fine, impressed lines of increment, are diagnostic. Umbonium thomasi Crosse 1862, is larger and quite differently colored and sculptured. [1]
Umbonium thomasi is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
This species occurs in the Sea of China and off Borneo.
Borneo is the third-largest island in the world and the largest in Asia. At the geographic centre of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and east of Sumatra.
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