''Guttula sibogae'' is a species of extremely small deep water

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 Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

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

Seguenziidae Seguenziidae is a family of very small deepwater sea snails, marine gastropod mollusks in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Bouchet, P. (2012). Seguenziidae. Accessed through ...

.WoRMS (2012). ''Guttula sibogae''. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492414 on 2013-04-14

Description

(Original description by Schepman) The height of the shell attains 5.5 mm. The shell has a conoidal shape with elevated spire. The periphery and the base are rounded, perforate and pearly. The outer layer, if present, is very thin and pellucid. The 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 are very convex and smooth. Only under a strong lens very faint growth striae and microscopic punctuations may be observed. The sutures are well-marked and marginated. 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 ...

is rounded, with a convex base and a small perforation, nearly concealed by the columella. The aperture is rounded, slightly angular above and stronger so below. The outer margin is thin and regularly curved The columellar margin is concave, reflected over the small umbilicus, angular near the base, where it joins the basal margin, and slightly protracted there. The thin operculum is horny, with few whorls, and concave at the outer side. 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 scarcely the length of 1 mm, and is about ⅓ mm in breadth. It has about 20 transverse rows of teeth; the rhachidian tooth is broad, depressed quadrangular with rounded upper angles and pointed basal ones. It has a large reflected cusp with one strong median denticle and two smaller ones on each side. The laterals, one on each side, have a depressed rhombic base, with a reflected margin, ending in a sharp cusp at the proximal side. The other teeth have the characters of being uncini. They are long, slender and hooked, with apparently smooth cusps. The outer ones are shorter, broader, with a few denticles on each side near the top, visible if expanded. The number of uncini is not large, but Schepman could not ascertain the exact number.Schepman 1908-1913, The Prosobranchia of the Siboga Expedition; Leyden,E. J. Brill,1908-13
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Distribution

This marine species occurs off Irian Jaya.

References

External links

To Biodiversity Heritage Library (3 publications)

To Encyclopedia of Life

To World Register of Marine Species
{{Taxonbar, from=Q13648916 Guttula Gastropods described in 1908