''Kylix paziana'' is a species of

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 in the family

Drilliidae The Drilliidae are a Taxonomy (biology), taxonomic family (biology), family of small predatory sea snails with high-spired shells. They are classified as marine (ocean), marine gastropod mollusks in the superfamily Conoidea. This family has no s ...

Description

The size of an adult shell varies between 12 mm and 17 mm; its diameter is 5 mm. (Original description) The small, acute shell is pale olivaceous. It contains 10

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, of which the first in the

protoconch A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called ...

is smooth and the second obscurely peripherally keeled. The subsequent whorls are normally sculptured. The suture is distinct The periphery of the upper whorls is nearer the succeeding than the preceding suture. The anal fasciole is constricted but crossed by the ribs. The spiral sculpture consists of (on the upper whorls 4 or 5, on the

body whorl The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk. In gastropods In gastropods, the b ...

about 14) strong cords with narrower groove-like interspaces, extending from the fasciole to 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 ...

. The cords are not swollen where they cross the ribs. The axial sculpture consists of (on the penultimate whorl 13, on the body whorl 10) rounded ribs with subequal interspaces, strongest at the shoulder, extending from suture to the base. The incremental lines are rather strong on the fasciole. The

anal sulcus The anal sulcus, also called the anal sinus or anal canal, in Gastropods is a notch, a shelly tube at the top of the aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and fo ...

is deep and rounded with a callous margin. The outer lip is arcuate and thin. The inner lip is simple. The siphonal canal is slightly recurved.Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920)
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Distribution

This species occurs in the demersal zone of the Pacific Ocean from the Gulf of California, Western Mexico, to Panama.

References

Tucker, J.K. 2004 ''Catalog of recent and fossil turrids (Mollusca: Gastropoda)''. Zootaxa 682:1–1295

External links

* {{DEFAULTSORT:Kylix Paziana paziana Gastropods described in 1919