''Clavus humilis'' 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 ...

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 ...

.Bouchet, P. (2015). Clavus humilis (E. A. Smith, 1879). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=719134 on 2016-08-11

Description

The length of the shell attains 14 mm. (Original description) The fusiformly ovate shell is chocolate-brown at the base of the

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 and lighter above. It is indistinctly banded with white round their middle, the band being most conspicuous on the ribs, which are also white at their upper extremities. The shell contains 8 whorls. The two apical whorls are smooth, convex, rather large. The rest is considerably excavated above and rather bulgingly convex inferiorly and obliquely ribbed. There are 9 ribs on the penultimate whorl, subobsolete in the concavity at the upper part of the whorl, and again nodulous at the suture. 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 ...

shows a transverse series of white dots on the ribs a little below the middle. The; ribs gradually attenuate downwards and do not extend quite to the extreme base. The latter, or cauda, is sculptured with about six oblique fine grooves. The small

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 ...

is brown, white at the sinus and at the termination of the series of dots a little below the middle. The large sinus is deep, rounded, in the concavity, lower sinuation slight. The outer lip is thin, arcuate, produced, with a large tumid varix at a little distance from the margin. The columella is a trifle oblique, coated with a smooth brown callus, adjoining the suture in the form of a tubercle. The siphonal canal is very short, broad, and not recurved.Smith, E.A. (1879) On a collection of Mollusca from Japan. Proceedings of the Zoological Society of London, 1879, 181–218
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Distribution

This marine species occurs off the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

and

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

References

External links

Kilburn R.N., Fedosov A. & Kantor Yu.I. (2014) The shallow-water New Caledonia Drilliidae of genus Clavus Montfort, 1810 (Mollusca: Gastropoda: Conoidea). Zootaxa 3818(1): 1–69.
{{DEFAULTSORT:Clavus Humilis humilis Gastropods described in 1879