Taxonomical history
''Cylindroteuthis'' was first described in 1879 by Claude-Emile Bayle. A belemnite originally described as the ''Cylindroteuthis'' species ''C. confessa'' has been re-described as ''Mesoteuthis soloniensis''.Biology and fossil finds
''Cylindroteuthis'' is a common find from several Jurassic formations. Specimen length ranges from . The most commonly preserved part of the animal is its guard, or rostrum (anatomy), rostrum, which was composed of calcite. The guard would not have been found on the exterior of ''Cylindroteuthis'', as traces of blood vessels have been discovered on some guards, suggesting that it was an internal feature. The guard housed a phragmocone, which allowed ''Cylindroteuthis'' to maintain buoyancy in water. Some better-preserved specimens have features similar to modern squid, such as ten arm-like appendages and an ink sac, intact. ''Cylindroteuthis'' has been recovered from the New Zealand geologic time scale#Jurassic Period, Temaikan Boatlanding Bay formation of Australasia. Three species of ''Cylindroteuthis'' (''C. knoxvillensis'', ''C. cf. newvillensis'', and ''C. venusta'') have been described from the Arctic region. In addition, about 2350 belemnite guards (including those of ''Cylindroteuthis'') have been recovered from Lower Cretaceous formations of northeastern Greenland, suggesting the presence of a sort of "immigration route" for belemnites. The findings also suggest the existence of a "proto Gulf Stream, Gulf-stream" as early as the Valanginian. Another species, ''C. cf. obeliscoides'' is associated with the early Cretaceous One Tree Formation of Vancouver Island.Ludvigsen, Rolf & Beard, Graham. 1997. West Coast Fossils: A Guide to the Ancient Life of Vancouver Island. pg. 93-94References
* ''Fossils'' (Smithsonian Handbooks) by David Ward (Page 163)External links