''Supplanaxis niger'' 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 ...

Planaxidae Planaxidae, commonly called planaxids or clusterwinks, are a taxonomic family of small and minute sea snails, pantropical marine gastropod molluscs in the superfamily Cerithoidea. They live on rocky shores in the littoral zone of the tropic ...

.Bouchet, P. (2015). Supplanaxis niger (Quoy & Gaimard, 1833). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=833642 on 2015-04-28

Description

The length of the shell attains 13 mm, its diameter 7.7 mm. (Original description of ''Planaxis abbreviata ogasawarana'' Pilsbry, 1905)) The shell is larger and longer than ''Planaxis abbreviata'' Pease (synonym of ''Supplanaxis niger'' (Quoy & Gaimard, 1833)), ovate-conic, thick and solid, chocolate-brown, 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 ...

covered with a dull fibrous cuticle. Sculpture of spiral grooves, often weak in the middle of the body whorl, strong below the suture and at the base. The shell contains about 6 convex

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. 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 ...

is oblique, the outer

lip The lips are the visible body part at the mouth of many animals, including humans. Lips are soft, movable, and serve as the opening for food intake and in the articulation of sound and speech. Human lips are a tactile sensory organ, and can be ...

is thickened within, and bearing 11 to 14 lirae, which extend into the throat. The basal and posterior notches are small, deep and rounded. Pilsbry,_H._A._(1905)._New_Japanese_marine_Mollusca._Proceedings_of_the_Academy_of_Natural_Sciences_of_Philadelphia._57:_101-112_[8_April
_113-122,_pls_2-5.html" ;"title=" April">Pilsbry, H. A. (1905). New Japanese marine Mollusca. Proceedings of the Academy of Natural Sciences of Philadelphia. 57: 101-112 [8 April
113-122, pls 2-5"> April">Pilsbry, H. A. (1905). New Japanese marine Mollusca. Proceedings of the Academy of Natural Sciences of Philadelphia. 57: 101-112 [8 April
113-122, pls 2-5/ref>

Distribution

This marine species occurs off Madagascar, Japan and Papua New Guinea.

References

* Poppe G.T., Tagaro S.P. & Stahlschmidt P. (2015). ''New shelled molluscan species from the central Philippines I''. Visaya. 4(3): 15–59. * Hasegawa K. (2017). Family Planaxidae. Pp. 794-795, in: T. Okutani (ed.), Marine Mollusks in Japan, ed. 2. 2 vols. Tokai University Press. 1375 pp.

External links

Quoy, J.C.R. & Gaimard, P. (1833) ''Mollusques''. In Dumont d’Urville, M.J. (Ed.) Voyage de Découverts de l’Astrolabe, Éxécuté par Ordre du Roi Pendant les Années 1826–1827–1828–1829, sous le Commandement de M. J. Dumont d' Urville. Zoologie, Tome 2. J. Tatsu

Smith, E. A. (1872). A list of the species of the genus Planaxis, with descriptions of eleven new species. Annals and Magazine of Natural History. ser. 4, 9: 37-47

Pease, W. H. (1869). Description of new species of marine Gasteropodæ inhabiting Polynesia. American Journal of Conchology. 5: 64-79

Pease, W. H. (1865). Descriptions of new genera and species of marine shells from the islands of the Central Pacific. Proceedings of the Zoological Society of London. (1865): 512-517

Dunker, W. & Zelebor, J. (1866). Bericht über die von der Novara-Expedition mitgebrachten Mollusken. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien. 16: 909-916.
{{DEFAULTSORT:Supplanaxis Niger Planaxidae Gastropods described in 1833