''Seguenzia dautzenbergi'' 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
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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 (2013). ''Seguenzia dautzenbergi'' Schepman, 1909. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492448 on 2013-06-10]
Description
(Original description by M. Schepman) The height of this whitish-yellow shell attains 4¼ mm. The rather small, umbilicate shell has a
spire forming a short gradated cone. The shell contains 7
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 of which the uppermost forms the smooth nucleus, followed by about 2 whorls with a submedian keel and displaying a cancellated appearance by the intercrossing of subequal spiral and radiating riblets. The other whorls have each 3 spirals, of which the uppermost runs at a little distance from the
suture. The next one is the strongest. It renders the whorls carinate about halfway, and a third which seems to run just in the rather conspicuous suture. Moreover, the interstices have more or less numerous fine spirals (numerous in the type, where they quite fill
the spaces). This spiral
sculpture is crossed by radiating riblets, running straight in an oblique direction, from the suture to the upper spiral, where they form small crenulations. In the next interstice they are concave and at last convex towards the basal liration. 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 strong peripheral keel, being the basal one of the upper whorls, and a convex base. There is another spiral at some distance from the peripheral keel, and 12 basal spirals of which three more spaced ones, at a larger distance from the subperipheral spiral, and 9 more central spirals, which are flatter, at subequal distances, the innermost bordering the umbilicus. These spirals are connected by small radiating riblets in the interstices. Moreover, these interstices are filled with similar finer spirals as in the
spire. The funnel-shaped
umbilicus is moderately wide, and probably pervious. Its wall shows fine radiating striae and a conspicuous spiral groove, terminating in a strong dentiform projection on the
columellar margin. The
aperture is moderately large, irregular in shape, with a rather deep sinus at the
suture (about 1½ mm, behind the most projecting part of the outer margin). It is rounded behind, with an upturned margin. The outer margin is thin, angular by the terminations of the spiral keels. The columellar margin is strongly excavated above. This excavation is bordered by the strong toothlike projection formed at the end of the umbilical groove. It has the appearance of a compressed fold. Below this tooth, the columellar margin runs obliquely back and terminates in a projecting point where it joins the slightly curved basal margin. The interior is nacreous.
Schepman 1908-1913, The Prosobranchia of the Siboga Expedition; Leyden,E. J. Brill,1908-13
/ref>
Distribution
This marine species occurs in the Makassar Strait
Makassar Strait is a strait between the islands of Borneo and Sulawesi in Indonesia. To the north it joins the Celebes Sea, while to the south it meets the Java Sea. To the northeast, it forms the Sangkulirang Bay south of the Mangkalihat Pe ...
, the Banda Sea and the Ceram Sea.
References
External links
Encyclopedia of Life
World Register of Marine Species
{{Taxonbar, from=Q14326678
dautzenbergi
Gastropods described in 1909