''Nihonia circumstricta'' is a

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 s ...

sea snail 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 ...

, a marine

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Cochlespiridae Cochlespiridae is a Taxonomy (biology), taxonomic family (biology), family of predatory sea snails, marine gastropod mollusks in the superfamily Conoidea. This family is not well differentiated morphologically, and there is poor congruence betwe ...

Description

The length of the shell varies between 50 mm and 65 mm, its diameter between 15.5 mm and 19 mm. The shell has an elongate-fusiform shape. It contains 9 weakly angulate

whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ...

Distribution

This species occurs in the Indian Ocean off

Tanzania Tanzania (; ), officially the United Republic of Tanzania ( sw, Jamhuri ya Muungano wa Tanzania), is a country in East Africa within the African Great Lakes region. It borders Uganda to the north; Kenya to the northeast; Comoro Islands and ...

at depths between 300–400 m.

References

* E. von Martens, Sitzungsberichte d. Gesellsch. nat. Freunde Berlin, 1901, p. 15.

External links

*
Martens, E. von. "Einige neue meer-conchylien von der deutschen tiefsee-expedition." Sitzungsberichte der Gesellschaft naturforschender Freunde zu Berlin, 1901: 14 26.1904 (1901): 1–179

Indo-Pacific Mollusca; Academy of Natural Sciences of Philadelphia. Delaware Museum of Natural History v. 2 no. 9–10 (1968–1969)
circumstricta Gastropods described in 1901 {{Cochlespiridae-stub