Odostomia hilgendorfi
Encyclopedia
Odostomia hilgendorfi is a species
of sea snail
, a marine
gastropod mollusk in the family
Pyramidellidae
, the pyrams and their allies.
of the protoconch
are small, helicoid, well rounded, moderately elevated, about one-third immersed in the first of the later whorls, having their axis almost at a right angle to them. The seven whorls of the teleoconch are rather high between the sutures. They are flattened, sub-
tabulately shouldered at the summits and decidedly angulated at the periphery. They are marked bv lines of growth and extremely tine, microscopic, closely placed, wavy, spiral striations. The shouldered summits of succeeding whorls fall quite a little anterior to the angulated periphery, giving the whorls a decidedly constricted appearance at the sutures, which appears decidedly channeled. The periphery of the body whorl
is decidedly angulated. The base of the shell is slightly rounded, marked like the spaces between the sutures. The aperture
is suboval. The posterior angle is obtuse. The outer lip
is thick. The columella is strong, curved, and provided with a prominent lamellar plate at its insertion. The parietal wall covered by a moderately thick callus.
and the Philippines
.
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 milk-white shell has a broadly elongate-conic shape, very regularly tapering and is subturrited. The type specimen measures 5 mm. The 2½ 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...
of the protoconch
Protoconch
A protoconch is an embryonic or larval shell of some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod...
are small, helicoid, well rounded, moderately elevated, about one-third immersed in the first of the later whorls, having their axis almost at a right angle to them. The seven whorls of the teleoconch are rather high between the sutures. They are flattened, sub-
tabulately shouldered at the summits and decidedly angulated at the periphery. They are marked bv lines of growth and extremely tine, microscopic, closely placed, wavy, spiral striations. The shouldered summits of succeeding whorls fall quite a little anterior to the angulated periphery, giving the whorls a decidedly constricted appearance at the sutures, which appears decidedly channeled. 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 angulated. The base of the shell is slightly rounded, marked like the spaces between the sutures. 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 suboval. The posterior angle is obtuse. 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 thick. The columella is strong, curved, and provided with a prominent lamellar plate at its insertion. The parietal wall covered by a moderately thick callus.
Distribution
This marine species was found in the Pacific Ocean off JapanJapan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
and the Philippines
Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...
.