Crassispira semicolon explained

Crassispira semicolon is an extinct species of carnivorous sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.^[1]

Subspecies: † Crassispira semicolon chameryensis (de Boury, 1899) (synonym: † Pleurotoma chameryensis de Boury, 1899) ^[2]

Description

The length of the shell attains 24.6 mm; its diameter 8.3 mm. It lived from roughly the Eocene period 47.8 - 41.3 million years ago, before having a last known appearance 3.60 - 2.59 million years ago, during the Cenozoic period.

Distribution

Fossils have been found in Pliocene and Middle Eocene strata off Norfolk, Great Britain; also in the Paris Basin and the Loire Basin, France

References

• G.B. Sowerby I (1812-1822), The mineral conchology of Great Britain 1-4 (1-66), 793 pp. pls. 1-383
• Tracey, S. and Jonathan A. Todd. "Nomenclatural changes for some Bracklesham Group gastropods." Tertiary Research 16 (1996): 41-54.

External links

• Fossilworks : Crassispira semicolon

Notes and References

1. http://www.bagniliggia.it/WMSD/HtmSpecies/5346000642.htm Worldwide Mollusc Species Data Base: Crassispira semicolon
2. J.-M. Pacaud and J. Le Renard. 1995. Révision des Mollusques Paléogénes du Bassin de Paris. IV - Liste systématique actualisée. Cossmanniana 3(4):155-187