Cylindroteuthis
{{Short description|Genus of molluscs}}
{{italic title}}
{{Taxobox
| name = Cylindroteuthis
| image = Cylindroteuthis UMMNH.jpg
| fossil_range = {{Fossil range|Early Jurassic|Early Cretaceous|ref={{cite book | title=Prehistoric Life: The Definitive Visual History of Life on Earth | publisher=Dorling Kindersley | author=Palmer, Douglas | year=2009 | location=New York | isbn=978-0-7566-5573-0 | page=238 | edition=1st American|display-authors=etal}}}}
| image_caption = Guard of C. puzosi, University of Michigan Museum of Natural History
| regnum = Animalia
| phylum = Mollusca
| classis = Cephalopoda
| unranked_ordo = Belemnoidea
| ordo = †Belemnitida
| genus = †Cylindroteuthis
| synonyms = *Cylindroteuthis puzosiana - synonym of C. puzosi
| subdivision_ranks = Species
| subdivision = See Species List
}}
Cylindroteuthis is a genus of belemnite that lived from the Early Jurassic to the Early Cretaceous. Its fossils have been found in Asia, Europe, North America, and New Zealand.
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.{{cite journal | title=New species of Early Bajocian Megateuthididae (Belemnitida) from the Pacific coast of Russia | author=Dzyuba, O. S. | journal=Paleontological Journal |date=May 2011 | volume=45 | issue=3 | pages=260–265 | doi=10.1134/S0031030111030051 |author2=Nalnyaeva, T. I. | bibcode=2011PalJ...45..260D | s2cid=55930907 }}
Paleobiology
Cylindroteuthis is a common find from several Jurassic formations. Specimen length ranges from {{convert|4|to|8+1/2|in|cm|order=flip|abbr=off|0}}. The most commonly preserved part of the animal is its guard, or 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.
Distribution
Cylindroteuthis has been recovered from the Temaikan Boatlanding Bay formation of Australasia.{{cite book | chapter=Australasia | chapter-url=https://books.google.com/books?id=iMus4MtzIl4C&pg=PA171 | title=The Jurassic of the Circum-Pacific | publisher=Cambridge University Press | access-date=February 18, 2012 | author=Westermann, Gerd E. G. | year=2005 | edition=illustrated | location=Cambridge, New York | page=171 | isbn=0-521-01992-3 | chapter-format=Google eBook}} Three species of Cylindroteuthis (C. knoxvillensis, C. cf. newvillensis, and C. venusta) have been described from the Arctic region.{{cite journal | title=Belemnites and biostratigraphy of the Jurassic-Cretaceous boundary deposits of northern East Siberia: New data on the Nordvik Peninsula | author=Dzyuba, O. S. | journal=Stratigraphy and Geological Correlation |date=February 2012 | volume=20 | issue=1 | pages=53–72 | doi=10.1134/S0869593811060037 |bibcode = 2012SGC....20...53D | s2cid=129494270 }} 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" as early as the Valanginian.{{cite journal | title=The Early Cretaceous of North-East Greenland: A crossroads of belemnite migration | author=Alsen, Peter |author2=Mutterlose, Jörg | journal=Palaeogeography, Palaeoclimatology, Palaeoecology |date=September 2009 | volume=280 | issue=1–2 | pages=168–182 | doi=10.1016/j.palaeo.2009.06.011| bibcode=2009PPP...280..168A }} 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. 93-94
Species List:
The genus contains thirteen species
- Cylindroteuthis clavicula
- Cylindroteuthis cuspidata
- Cylindroteuthis gelida
- Cylindroteuthis glennensis
- Cylindroteuthis jacutica
- Cylindroteuthis knoxvillensis
- Cylindroteuthis newvillensis
- Cylindroteuthis occidentalis
- Cylindroteuthis oweni
- Cylindroteuthis porrecta
- Cylindroteuthis porrectiformis
- Cylindroteuthis puzosi
- Cylindroteuthis venusta
References
{{Reflist|colwidth=33em}}
- Fossils (Smithsonian Handbooks) by David Ward (Page 163)
External links
- [https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=15857 Cylindroteuthis] in the Paleobiology Database
{{Taxonbar|from=Q4119243}}
Category:Cretaceous cephalopods
Category:Prehistoric cephalopod genera
Category:Fossil taxa described in 1879
Category:Mesozoic cephalopods of Asia
Category:Mesozoic cephalopods of North America
Category:Cretaceous cephalopods of Europe
Category:Mesozoic cephalopods of Europe