''Turbonilla callipeplum'' is a
species of
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 Pyramidellidae, the pyrams and their allies.
[WoRMS (2011). ''Turbonilla callipeplum'' Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575979 on 2012-03-01][Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064]
Description
The rather stout, milk-white shell has an elongate-conic shape. Its length measures 5.1 mm. The two
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 the
protoconch
A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called ...
form a planorboid
spire, whose axis is at right angles to the succeeding turns, in the first of which it is about one-fourth immersed. The nine whorls of the
teleoconch are flattened in the middle, with a strongly sloping shoulder which extends over the posterior fourth between the
sutures. They form a decided angle at its anterior termination. They are slightly contracted at the suture. They are marked by slender, sinuous, slightly retractive, sublamellar, axial ribs, of which 14 occur upon the first two whorls, 16 upon the third and fourth, 18 upon the fifth, and 20 upon the remaining turns. The intercostal spaces vary somewhat in width. They are about four times as wide as the ribs, marked by a double series of narrow pits, one of which is at the periphery and the other at the anterior termination of the posterior third of the whorls. In addition to these pits there are finely incised lines of varying strength, 18 of which occur between the two pits and 9 between the posterior pit and the summit. The sutures are well impressed. The periphery of 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 slightly angulated. The base of the shell is marked by the feeble continuations of the axial ribs, which extend a little beyond the periphery, and 17 almost equal and almost equally spaced, slender, incised spiral lines. The aperture cannot be seen on the type specimen because the outer lip is fractured. The
columella is reflected.
[Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 96: 1909](_blank)
/ref>
Distribution
The species occurs in the Pacific Ocean off Panama Bay, Panama.
References
External links
To USNM Invertebrate Zoology Mollusca Collection
To World Register of Marine Species
{{Taxonbar, from=Q7854010
callipeplum
Gastropods described in 1909