Odostomia callimene
Encyclopedia
Odostomia callimene is a species
of sea snail
, a marine
gastropod mollusk in the family
Pyramidellidae
, the pyrams and their allies.
are small, obliquely immersed in the first of the succeeding turns, above which only half of the last volution projects. The projecting portion extends considerably beyond the outline of the post-nuclear spire
. The five post-nuclear whorls are slightly rounded, somewhat constricted at the summit. They are marked by almost vertical lines of growth and very regular, closely spaced, wavy, spiral striations; of the latter about 25 occur between the sutures and the third whorl. The periphery of the body whorl
is decidedly inflated and strongly rounded. The base of the shell is moderately long, well rounded, with a narrow umbilicus, marked like the spire. The sutures are moderately impressed. The aperture
is large, slightly effuse anteriorly. The posterior angle is acute. The outer lip
is very thin. The inner lip is quite long, decidedly flexuose and somewhat reflected. It is provided with a strong fold opposite the umbilical chink. The parietal wall is glazed with a thin callus.
, California
.
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...
of sea snail
Sea snail
Sea snail is a common name for those snails that normally live in saltwater, marine gastropod molluscs....
, a marine
Marine (ocean)
Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...
gastropod mollusk in the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...
Pyramidellidae
Pyramidellidae
Pyramidellidae, common name the pyram family, or pyramid shells, is a voluminous taxonomic family of mostly small and minute ectoparasitic sea snails, marine heterobranch gastropod molluscs or micromolluscs....
, the pyrams and their allies.
Description
The elongate-ovate shell is milk-white. The shell measures 3.1 mm. The nuclear whorlsWhorl (mollusc)
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...
are small, obliquely immersed in the first of the succeeding turns, above which only half of the last volution projects. The projecting portion extends considerably beyond the outline of the post-nuclear spire
Spire (mollusc)
A spire is a descriptive term for part of the coiled shell of mollusks. The word is a convenient aid in describing shells, but it does not refer to a very precise part of shell anatomy: the spire consists of all of the whorls except for the body whorl...
. The five post-nuclear whorls are slightly rounded, somewhat constricted at the summit. They are marked by almost vertical lines of growth and very regular, closely spaced, wavy, spiral striations; of the latter about 25 occur between the sutures and the third whorl. The periphery of the body whorl
Body whorl
Body whorl is part of the morphology of a coiled gastropod mollusk.- In gastropods :In gastropods, the body whorl, or last whorl, is the most recently-formed and largest whorl of a spiral or helical shell, terminating in the aperture...
is decidedly inflated and strongly rounded. The base of the shell is moderately long, well rounded, with a narrow umbilicus, marked like the spire. The sutures are moderately impressed. The aperture
Aperture (mollusc)
The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where part of the body of the animal emerges for locomotion, feeding, etc....
is large, slightly effuse anteriorly. The posterior angle is acute. The outer lip
Lip (gastropod)
In the shell of a gastropod mollusk , the margin of the aperture is called the lip or the peristome. In other words, this is a term used to describe part of gastropod shell anatomy....
is very thin. The inner lip is quite long, decidedly flexuose and somewhat reflected. It is provided with a strong fold opposite the umbilical chink. The parietal wall is glazed with a thin callus.
Distribution
This species occurs in the Pacific Ocean off San PedroSan Pedro Bay (California)
San Pedro Bay is an inlet on the Pacific Ocean coast of southern California, United States. It is the site of the Port of Los Angeles and the Port of Long Beach, which together form the fifth-busiest port facility in the world and easily the busiest in the Western Hemisphere...
, California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
.