''Archiminolia olivaceostrigata'' 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 ...

.Schepman 1908-1913, The Prosobranchia of the Siboga Expedition; Leyden, E. J. Brill,1908-13
/ref>

Description

(Original description by M. Schepman) The height of the shell attains 9.5 mm, its diameter 11.5 mm. The rather thin shell has a depressed-conoidal shape. Its upper

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 are nacreous, with a very beautiful purple and green tinge, the last whorls whitish, adorned on the upper surface by rather broad, olivaceous streaks. The shell contains six whorls. The nucleus is smooth, followed by a 2nd and 3rd whorl, each with 6 spiral lirae of which the upper ones are slightly undulate. On the fourth whorl the lirae disappear, only the 'upper one remains and becomes beaded. It borders the broadly canaliculated suture, which in this and in the fifth whorl, is crossed by conspicuous striae, which run partly also on the convex, smooth, lower part of these whorls. Near 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 ...

the beads disappear, the suture becomes less broad and deep. This body whorl is nearly smooth, except for most tender spiral and radiating striae, only visible under magnification, and a few remote deeper striae near the suture, being the continuation of the beads. It is strongly depressed, more convex above than below, with a blunt angle, but no keel. The umbilicus is funnel-shaped, moderately wide and pervious. Its walls are smooth, with only a few growth striae. It is bordered by a spiral ridge, which is indistinctly beaded. 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 rounded-triangular. The upper and basal margins are regularly rounded, the upper one being more curved. The columellar margin is nearly straight, slightly expanded at its upper end above the umbilicus, thickened below and forming a distinct angle with the basal margin, largely due to the ending of the umbilical ridge. Interior of aperture strongly iridescent. The thin operculum is corneous, with many whorls (about 10). The outer surface is hollow, with irregular, radiating striae, which are more numerous and regular near the sutural line. The inner surface is convex, and very smooth. The

radula The radula (, ; plural radulae or radulas) is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food ...

has about 26 rows of teeth and 7 median rows, with a large number of uncini. The rhachidian tooth has a subquadrate body with winged sides and a long triangular cusp with convex sides, which are serrated. The body of the first lateral is nearly quadrate, with a broad triangular cusp, serrated on the distal and part of the proximal margin. The second lateral is oblong and serrated like the first one. The third lateral has a quadrangular body, with a simple cusp. The fourth lateral is very large, its body irregular, its cusp long, serrated on both sides, but this is only visible on the upper side in its normal position. The uncini, the number of which I cannot ascertain, are long, slender, and apparently smooth, though in some of them, a few very small denticles are present, but they are only visible in an expanded position. The bodies of the median teeth are brown especially towards the centre.

Distribution

This marine species occurs in the Celebes Sea.

References

* Vilvens C. (2009). New species and new records of Solariellidae (Gastropoda: Trochoidea) from Indonesia and Taiwan. Novapex 10(3): 69–96

External links

{{DEFAULTSORT:Archiminolia Olivaceostrigata olivaceostrigata Gastropods described in 1908