''Ilanga fulgens'' 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 ...

Solariellidae Solariellidae is a family of small sea snails, marine gastropod mollusks in the superfamily Trochoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Gofas, S. (2011). Solariellidae. Accessed through: World Register of ...

Description

(Original description by M. Schepman) The size of the shell varies between 5 mm and 12 mm. The shell has a depressed, slightly conical shape. It is rather thin. The upper surface is yellowish-white, with ziczac-lines and blotches of yellowish-brown, forming more or less distinct bands, of which one, consisting of triangular white spots and very small blotches, borders the suture. A peripheral band is distinctly articulated with white and brown and an intermediate band of more arrow-headed blotches. The interstices are filled by the yellowish-brown lines, which are often confluent, leaving only small whitish spots. The basal surface is lighter, with scarce markings, of which a band of blotches, bordering the umbilicus, is the most conspicuous. The shell contains about five

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 nucleus is smooth. The next two whorls contain a few (3 or 4) lirae, which are slightly irregular, the upper one is beaded. The lirae become less distinct, being broader and flatter on the next whorl, and are transferred in distant striae with smooth interstices. The infrasutural beads, cease on the penultimate whorl. Besides this sculpture, the whole shell has a smooth, shining appearance, with very fine lines of growth. 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 ...

has only a few spiral striae near the periphery. The whorls are slightly convex, the last one is a little depressed and much enlarged, but has no keel. The basal surface is smooth, with fine lines of growth and short, radiating striae round the umbilicus, which is large, pervious, funnel-shaped, sculptured with lines of growth and about 9 spiral lirae. 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 subcircular, slightly angular above and compressed near the periphery. The outer margin is thin. The columellar margin is sinuous, thickened, slightly reflected above, running without appreciable angle into the basal margin. The interior of the aperture is nacreous.Schepman 1908-1913, The Prosobranchia of the Siboga Expedition; Leyden,E. J. Brill,1908-13
(described as ''Solariella zacalloides'')

Distribution

This marine species occurs in the

East China Sea The East China Sea is an arm of the Western Pacific Ocean, located directly offshore from East China. It covers an area of roughly . The sea’s northern extension between mainland China and the Korean Peninsula is the Yellow Sea, separated b ...

, off

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 ...

, 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

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

References

* Higo, S., Callomon, P. & Goto, Y. (1999). ''Catalogue and bibliography of the marine shell-bearing Mollusca of Japan''. Osaka. : Elle Scientific Publications. 749 pp. * Poppe G.T., Tagaro S.P. & Dekker H. (2006) ''The Seguenziidae, Chilodontidae, Trochidae, Calliostomatidae and Solariellidae of the Philippine Islands''. Visaya Supplement 2: 1–228. page(s): 129 * Vilvens C. (2009). ''New species and new records of Solariellidae (Gastropoda: Trochoidea) from Indonesia and Taiwan.'' Novapex 10(3): 69-96

External links

*
Dall W.H. (1907). Descriptions of new species of shells, chiefly Buccinidae, from the dredgings of the U.S.S. "Albatross" during 1906, in the northwestern Pacific, Bering, Okhotsk, and Japanese Seas. Smithsonian Miscellaneous Collections. 50(2): 139-173

Vilvens C. & Williams S.T. (2020). New species of Ilanga (Gastropoda: Trochoidea: Solariellidae) from the Indo-West Pacific. Zootaxa. 4732(2): 201-257
{{DEFAULTSORT:Ilanga Fulgens fulgens Gastropods described in 1907