''Aforia crebristriata'' 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 ...

. It is also considered as the type species of the genus ''

Dallaforia ''Dallaforia'' is a genus of sea snails, marine gastropod mollusks in the family Cochlespiridae Cochlespiridae is a Taxonomy (biology), taxonomic family (biology), family of predatory sea snails, marine gastropod mollusks in the superfamily ...

'' through its synonym ''Irenosyrinx crebristriata'' Dall, 1908

Description

The length of the shell attains 48 mm, its diameter 16.5 mm. (Original description) The shell is of moderate size. It is white, covered with a pale yellow periostracum. The acute

spire A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spires are ...

is a little shorter than the

aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An opt ...

. The six

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 ...

s, exclusive of the (lost) nucleus, are rounded. The; suture is very distinct. There is no axial

sculpture Sculpture is the branch of the visual arts that operates in three dimensions. Sculpture is the three-dimensional art work which is physically presented in the dimensions of height, width and depth. It is one of the plastic arts. Durable sc ...

, except incremental lines, unless on the (eroded) apical whorls. The siphonal fasciole is wide, extending from the suture to an obscure ridge which forms the shoulder of the whorl just behind the periphery. On the fasciole are six or seven smooth rounded subequal spiral threads with equal or wider interspaces, more crowded anteriorly. Beyond the shoulder are nine similar but coarser threads, sometimes entire, sometimes flattened or even medially sulcate on top, extending over the base, and on the region of the

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...

as many more, smaller and more distant, crossed by obvious incremental lines. The

is elongate and rather narrow. The anal sulcus is very wide but shallow. The outer lip is produced, evenly arcuate to the end of the canal, not constricted at the base of the whorl. The columellar lip is smooth The columella is short, obliquely truncate, gyrate, the axis pervious. The siphonal canal is wide, hardly differentiated.W.H. Dall (1908) Reports on the Mollusca and Brachiopoda, Bulletin of the Museum of Comparative Zoology at Harvard College. vol. 43
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Distribution

This marine species is found in the upper abyssal regions from

Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., ...

Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

, USA.

References

{{DEFAULTSORT:Aforia Crebristriata crebristriata Gastropods described in 1908