''Mauidrillia cinctuta '' 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

Horaiclavidae Horaiclavidae is a family of predatory sea snails, marine gastropod mollusks in the superfamily Conoidea. In 2011 this family was split off from the family Pseudomelatomidae (formerly the subfamily Crassispirinae McLean, 1971) by Bouchet P., Ka ...

.Marshall, B. (2015). Mauidrillia cinctuta. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=831562 on 2017-02-08

Description

The length of the shell attains 7 mm, its diameter 3 mm. Teleoconch of about 5 whorls, near middle on spire. Axial sculpture of narrow, opisthocline

costae In vertebrate anatomy, ribs ( la, costae) are the long curved bones which form the rib cage, part of the axial skeleton. In most tetrapods, ribs surround the chest, enabling the lungs to expand and thus facilitate breathing by expanding the c ...

with much border interspace. Costae weaker on last whorl on some shells. Costae weaker on whorl of most scarcely extending onto base reduced to short on some shell. 12-15 costae on penultimate whorl. Inner lip thinly callused, no parietal callus pad. Outer lip thin, with shallow U-shaped

Anal sulcus The anal sulcus, also called the anal sinus or anal canal, in Gastropods is a notch, a shelly tube at the top of the aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and fo ...

Distribution

This extinct marine species was found in Tertiary strata of the Chatton shellbed, New Zealand.

References

* Maxwell, P.A. (2009). ''Cenozoic Mollusca''. pp. 232–254 in Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch

External links

Museum of New Zealand: Mauidrillia cinctuta
cinctuta Gastropods described in 1929 {{Horaiclavidae-stub