Odostomia baldridgeae
Encyclopedia
Odostomia baldridgeae is a species
of sea snail
, a marine
gastropod mollusk in the family
Pyramidellidae
, the pyrams and their allies.
The epithet of this species refers to Mrs. B. L. Baldridge.
are immersed in the first of the succeeding turns, above which only half of the last volution projects. The seven post-nuclear whorls are situated high between the sutures. They are appressed at the summit and slightly rounded. They are marked by feeble lines of growth, and many sub-equal and subequally spaced, strongly incised, spiral lines. About 25 of these occur between the sutures of the fourth whorl and about 30 between the summit and the periphery on the penultimate turn. The sutures are strongly impressed. The periphery of the body whorl
is somewhat angulated. The base of the shell is well rounded, moderately long, marked like the spire
. The aperture
is elongate-oval, slightly effuse anteriorly. The posterior angle is acute. The thin outer lip
is decidedly sinuous, bent back at the posterior angle to almost form a notch. The inner lip is
moderately long, oblique, slightly curved and slightly revolute, provided with a strong fold at its insertion. The parietal wall 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.
The epithet of this species refers to Mrs. B. L. Baldridge.
Description
The shell is very elongate-conic, yellowish-white. It measures 5.6 mm. The small 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 immersed in the first of the succeeding turns, above which only half of the last volution projects. The seven post-nuclear whorls are situated high between the sutures. They are appressed at the summit and slightly rounded. They are marked by feeble lines of growth, and many sub-equal and subequally spaced, strongly incised, spiral lines. About 25 of these occur between the sutures of the fourth whorl and about 30 between the summit and the periphery on the penultimate turn. The sutures are strongly impressed. 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 somewhat angulated. The base of the shell is well rounded, moderately long, marked like the 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 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 elongate-oval, slightly effuse anteriorly. The posterior angle is acute. The thin 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 decidedly sinuous, bent back at the posterior angle to almost form a notch. The inner lip is
moderately long, oblique, slightly curved and slightly revolute, provided with a strong fold at its insertion. The parietal wall 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...
.