''Microdrillia crispata'' is an extinct 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

Borsoniidae Borsoniidae is a monophyletic family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet, P. (2011). Borsoniidae. Accessed through: World Register of Marine Species at http://www.marinespecies.o ...

.Rosenberg, G. (2015). Microdrillia crispata (Cristofori & Jan, 1832). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://marinespecies.org/aphia.php/aphia.php?p=taxdetails&id=533094 on 2016-03-16 There is one subspecies: ''Microdrillia crispata vatreni'' Della Bella & Tabanelli, 1986

Description

The length of the shell attains 5 mm. The shell is acuminately turreted. The

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 convex, with numerous prominent revolving carinae, the interstices narrow, obliquely longitudinally striated. The color of the shell is white, the apex tinged with fuscous. The

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...

is very short. The sinus is ample.

Distribution

This extinct marine species has been found in Northeast Brasil. It also occurred in the Upper Pliocene of

Romagna Romagna ( rgn, Rumâgna) is an Italian historical region that approximately corresponds to the south-eastern portion of present-day Emilia-Romagna, North Italy. Traditionally, it is limited by the Apennines to the south-west, the Adriatic to t ...

, Italy.

References

* Chirli (C.) & Richard (C.), 2008 Les Mollusques plaisanciens de la Côte d’Azur, p. 1–128

External links

Bouchet P., Kantor Yu.I., Sysoev A. & Puillandre N. (2011) A new operational classification of the Conoidea. Journal of Molluscan Studies 77: 273–308

''Microdrillia crispata''

Cesare Tabanelli, ASSOCIAZIONI DI PALEOCOMUNITÁ BATIALI A MOLLUSCHI BENTONICI NEL PLIOCENE DELLA ROMAGNA; Quaderno di Studi e Notizie di Storia Naturale della Romagna, 26: 1–80 giugno 2008 ISSN 1123-6787

Image of the shell in Erminio Caprotti, MALACOFAUNA DELLO STRATOTIPO PIACENZIANO (PLIOCENE DI CASTELL'ARQUATO); Conchilie 12 (1976)
{{DEFAULTSORT:Microdrillia Crispata crispata Gastropods described in 1832