''Mioawateria extensa'' 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

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

Raphitomidae Raphitomidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 39 ...

Description

The length of the shell varies between 4 mm and 12.5 mm. The shell is in most features like '' Pleurotomella normalis'' (Dall, 1881), but more elongated, with nine

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 revolving threads (except the sutural ones) obsolete except near the anterior end 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 ...

. With a tendency of the thread next the suture to be stronger and more strongly knobbed than (as in the normal form) the outer one. There are twenty to twenty-five transverse threads, more numerous and in large specimens hardly noticeable except near the suture. The spire is nearly equal to the body whorl and the aperture is about one third of the shell.

Distribution

''M. extensa'' can be found in Caribbean waters, ranging from the coast of Louisiana to Cuba.Tunnell, John W., Jr., Felder, Darryl L., & Earle, Sylvia A., eds. ''Gulf of Mexico Origin, Waters, and Biota, Volume 1: Biodiversity.'' Texas A&M University Press, 2009. 668.

References

External links

*
Morassi M. & Bonfitto A. (2013) ''Three new bathyal raphitomine gastropods (Mollusca: Conoidea) from the Indo-Pacific region.'' Zootaxa 3620(4): 579–588

Gastropods.com: ''Mioawateria extensa''
{{DEFAULTSORT:Mioawateria Extensa extensa Gastropods described in 1881