Crassispira semicolon is an extinct species of carnivorous sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.Worldwide Mollusc Species Data Base: Crassispira semicolon
Subspecies: † Crassispira semicolon chameryensis (de Boury, 1899) (synonym: † Pleurotoma chameryensis de Boury, 1899)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
Description
The length of the shell attains 24.6 mm; its diameter is 8.3 mm. It lived from roughly the Eocene period 47.8 - 41.3 million years ago, before having a last known appearance 2.59 - 3.60 million years ago, during the Cenozoic period: 10k years before the Quanternary period: homo sapians.
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; in sedimentary rocks.
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