Extra extra
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Extra extra is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Cystiscidae. Some malacologists place this genus more simply in the family Marginellidae.
Note: Gastropod taxonomy has been very much in flux for many years. This is especially true currently because of new research in molecular phylogeny. Therefore different reliable sources can yield very different classifications, especially in certain poorly understood groups.
Extra is a monotypic genus, in other words, it has only one species in it.
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[edit] Diagnosis
Shell minute, white, semitranslucent; prominent axial costae present; spire sunken but not immersed; lip strongly thickened, smooth, lacking denticulation, flared posteriorly; siphonal notch absent; posterior notch absent; distinct parietal callus "shield" present; collumela multiplicate, with 5 plications plus parietal lirae, plications slightly excavated inside aperture due to parietal callus deposits.
[edit] Type species
Extra extra Jousseaume, 1894; M
[edit] Distribution and Habitat
Recorded only from western Indian Ocean, apparently in shallow water.
[edit] References
- Coovert, Gary A. and Holly K. Coovert 1995. Revision of the Supraspecific Classification of Marginelliform Gastrapods. The Nautilus 109(2 & 3):43-110. (latest family review)
