Extra extra

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Extra extra
ExtraExtra.jpg
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Neogastropoda
Superfamily: Muricoidea
Family: Cystiscidae / Marginellidae
Subfamily: Cystiscinae
Genus: Extra / Marginella
Jousseaume, 1894
Species: E. extra / M. extra
Binomial name
Extra extra
(Jousseaume, 1894)
Synonyms

Marginella extra Jousseaume, 1894

Extra extra or Marginella extra[1] 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.

Taxonomy[edit]

Marginella extra was originally described under name Extra extra by French zoologist Félix Pierre Jousseaume in 1894. He placed this species to the monotypic genus Extra Jousseaume, 1894. Dautzenberg (1929)[2] moved this species into genus Marginella.

Diagnosis[edit]

The shell is 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.

Distribution and habitat[edit]

Recorded only from western Indian Ocean along Madagascar, apparently in shallow water.

References[edit]

  1. ^ WoRMS (2009). Extra extra (Jousseaume, 1894). Accessed through the World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=217193 on 4 December 2010
  2. ^ Dautzenberg, Ph. (1929). Mollusques testaces marins de Madagascar. Faune des Colonies Françaises, Tome III
  • Coovert G. A. & Coovert H. K. (1995). "Revision of the Supraspecific Classification of Marginelliform Gastropods". The Nautilus 109(2 & 3):43-110.

External links[edit]