Molecular Biology and Genetics

Molecular Biology

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Specimen Records: 5
Species: 1
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Cystiscidae

Cystiscidae is a taxonomic family of minute sea snails, marine gastropod mollusks or micromollusks.

Description[edit]

The shell is minute to large, either white, uniformly colored, or patterned; the surface is smooth, sculptured, or axially costate; the spire is flat to immersed, or low to tall; the protoconch is paucispiral; the lip is thickened, smooth or denticulate; an external varix is present or absent; a siphonal notch is present or absent; a posterior notch is present or absent; the columella is multiplicate, internal whorls cystiscid or modified cystiscid type. Mantle cavity with monopectinate ctenidium and bipectinate osphradium. Proboscis pleurembolic; jaws absent; typical radular sac present.

Taxonomy[edit]

The family was erected by William Stimpson for a single included species based on unusual features of the head and radula. Subsequent authors included this group in the family Marginellidae.

Coan (1965)[2] recognized this group as a subfamily, but he did not include such genera as Gibberula, Persicula, and Canalispira. Rule of priority of the ICZN require that the name Cystiscidae must be used, but this is unfortunate because the type specimen of the type species is lost, and that species is poorly known.

2005 taxonomy[edit]

The family Cystiscidae consists of four subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005):[3]

Genera[edit]

Genera within the family Cystiscidae include:

Cystiscinae

Granulininae

Persiculinae

Plesiocystiscinae

Abbreviations:

  • (M) - original designation by monotype
  • OD - original designation
  • OD (M) - original designation as type species, but also monotypic
  • SD - subsequent designation as type
  • SD (M) - subsequent designation as type species, but also monotypic
  • T - original designation by tautonomy

Comparisons of shells of the genera:

References[edit]

  1. ^ Stimpson W. (1865). "On certain genera and families of zoophagous gastropods". American Journal of Conchology 1(1): 55-64, plates 8-9.
  2. ^ Coan E. (1965). "A proposed reclassification of the family Marginellidae (Mollusca: Gastropoda)". The Veliger 7(3): 184-193. page 186.
  3. ^ Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). "Classification and nomenclator of gastropod families". Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1–397. ISBN 3925919724. ISSN 0076-2997. 
  4. ^ a b c Coovert G. A. & Coovert H. K. (1995). "Revision of the Supraspecific Classification of Marginelliform Gastropods". The Nautilus 109(2&3): 43-110, page 66, 70, 73.
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