Extra extra | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Caenogastropoda |
Order: | Neogastropoda |
Family: | Cystiscidae |
Subfamily: | Cystiscinae |
Genus: | Extra |
Species: | E. extra |
Binomial name | |
Extra extra (Jousseaume, 1894) [1] | |
Synonyms | |
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Extra extra or Marginella extra [2] 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.
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) [3] moved this species into genus Marginella .
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; columella multiplicate, with 5 plications plus parietal lirae, plications slightly excavated inside aperture due to parietal callus deposits.
Recorded only from western Indian Ocean along Madagascar, apparently in shallow water.
Marginellidae, or the margin shells, are a taxonomic family of small, often colorful, sea snails, marine gastropod molluscs in the clade Neogastropoda.
Cystiscidae is a taxonomic family of minute sea snails, marine gastropod mollusks or micromollusks.
Plesiocystiscus is a genus of minute predatory sea snails, marine gastropod molluscs or micromolluscs in the family Cystiscidae.
Cystiscus is a taxonomic genus of minute sea snails, marine gastropod mollusks or micromollusks.
Topaginella is a genus of minute fossil sea snails, marine gastropod mollusks or micromollusks in the family Cystiscidae. Like all of the related genera, this genus is sometimes still classified in the family Marginellidae.
Crithe is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Cystiscidae. This genus is sometimes still placed within the Marginellidae.
Persicula is a taxonomic genus of minute to small predatory sea snails, marine gastropod mollusks. It includes several species which are micromollusks.
Plesiocystiscinae is a subfamily of minute sea predatory sea snails, marine gastropod mollusks or micromollusks in the infraorder Neogastropoda.
Cystiscinae are a taxonomic subfamily of minute sea snails. These are marine gastropod mollusks or micromollusks in the family Cystiscidae, and the clade Neogastropoda.
Persiculinae is a taxonomic subfamily of minute to small predatory sea snails, marine gastropod mollusks. This subfamily includes several species which are micromollusks.
Bullata is a genus of small to large sea snails, marine gastropod mollusks in the family Marginellidae, the margin snails.
Conus milneedwardsi, known to collectors as the "Glory of India", is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.
Phasianella solida, common name the solid pheasant, is a species of sea snail, a marine gastropod mollusk in the family Phasianellidae.
Turbo imperialis is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.
Cystiscus vavauensis is a species of very small sea snail, a marine gastropod mollusk or micromollusk in the family Cystiscidae.
Marginella virgula is a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails.
Chicoreus microphyllus, common name the curly murex, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Marginella gloriosa is a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails.
Marginellinae is a taxonomic subfamily within the larger family of Marginellidae, a group of small sea snails, marine gastropod molluscs in the superfamily Volutoidea.
Miralda gemma is a species of sea snail, a marine gastropod mollusc in the family Pyramidellidae, the pyrams and their allies.