The size of Futabasaurus has been estimated within the range of 6.4–9.2 metres (21–30 ft) in length and 700 kg (1,500 lb) in body mass.[1][2] It can be distinguished from other elasmosaurids by the following characteristics: there is a long distance between the eye sockets and nostrils; the interclavicles and clavicles are fused, and the anterior edge is bent; the humerus is relatively long; and the femora are slim and show prominent muscle scars.[3]
Discovery and naming
Futabasaurus is the first elasmosaurid found in Japan. It was originally known as either "Wellesisaurus sudzuki" or "Futaba-ryu" before publication. The type specimen of Futabasaurus was found in the Irimazawa Member of the Tamayama Formation, in the Futaba Group of Fukushima Prefecture, Japan. The rocks in which it were found date to the Inoceramus amakusensis zone of the early Santonian. The fossils were found by Tadashi Suzuki, then a high school student.[3] Many of the bones of the type specimen show signs of apparent scavenging or predation by sharks.[3]
The genus Futabasaurus was named after the Futaba Group, in which it was discovered; the species name is derived from the family name of its discoverer, Suzuki.[3] The name "Futabasaurus" has also been used for an unrelated theropoddinosaur, also from the Late Cretaceous of Japan. However, this dinosaur was not officially named, and remains a nomen nudum.
Classification
Pre-2006 skeletal mount which is informally labelled as "Wellesisaurus sudzuki" (with a large stone containing crinoids and ammonites in the background)
The following cladogram shows the placement of Futabasaurus within Elasmosauridae following an analysis by Rodrigo A. Otero, 2016:[4]
^O'Gorman, J.P. (2016). "A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids". Ameghiniana. 53 (3): 245–268. doi:10.5710/AMGH.29.11.2015.2928. S2CID 133139689.
^Paul, Gregory S. (2022). The Princeton Field Guide to Mesozoic Sea Reptiles. Princeton University Press. p. 114. ISBN9780691193809.
^ abcdSato, Tamaki; Hasegawa, Yoshikazu; Manabe, Makoto (2006). "A new elasmosaurid plesiosaur from the Upper Cretaceous of Fukushima, Japan". Palaeontology. 49 (3): 467–484. doi:10.1111/j.1475-4983.2006.00554.x.
^Otero, R. A. (2016). "Taxonomic reassessment of Hydralmosaurus as Styxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous". PeerJ. 4: e1777. doi:10.7717/peerj.1777. PMC4806632. PMID 27019781.
Wikispecies has information related to Futabasaurus.
Wikimedia Commons has media related to Futabasaurus.
External links
(German)
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futabasaurus, informally, named, dinosaur, list, informally, named, dinosaurs, genus, plesiosaur, from, late, cretaceous, fukushima, japan, described, named, 2006, assigned, family, elasmosauridae, genus, contains, species, suzukii, temporal, range, late, cret. For the informally named dinosaur see List of informally named dinosaurs Futabasaurus is a genus of plesiosaur from the Late Cretaceous of Fukushima Japan It was described and named in 2006 and was assigned to the family Elasmosauridae The genus contains one species F suzukii FutabasaurusTemporal range Late Cretaceous Santonian PreꞒ Ꞓ O S D C P T J K Pg N Reconstructed skeleton at National Science Museum TokyoScientific classificationKingdom AnimaliaPhylum ChordataClass ReptiliaSuperorder SauropterygiaOrder PlesiosauriaFamily ElasmosauridaeGenus FutabasaurusSato Hasegawa amp Manabe 2006Species F suzukiiBinomial name Futabasaurus suzukiiSato Hasegawa amp Manabe 2006 Contents 1 Description 2 Discovery and naming 3 Classification 4 See also 5 References 6 External linksDescription Edit Cast of fossils of Futabasaurus suzukii exhibited at the National Museum of Nature and Science The size of Futabasaurus has been estimated within the range of 6 4 9 2 metres 21 30 ft in length and 700 kg 1 500 lb in body mass 1 2 It can be distinguished from other elasmosaurids by the following characteristics there is a long distance between the eye sockets and nostrils the interclavicles and clavicles are fused and the anterior edge is bent the humerus is relatively long and the femora are slim and show prominent muscle scars 3 Discovery and naming EditFutabasaurus is the first elasmosaurid found in Japan It was originally known as either Wellesisaurus sudzuki or Futaba ryu before publication The type specimen of Futabasaurus was found in the Irimazawa Member of the Tamayama Formation in the Futaba Group of Fukushima Prefecture Japan The rocks in which it were found date to the Inoceramus amakusensis zone of the early Santonian The fossils were found by Tadashi Suzuki then a high school student 3 Many of the bones of the type specimen show signs of apparent scavenging or predation by sharks 3 The genus Futabasaurus was named after the Futaba Group in which it was discovered the species name is derived from the family name of its discoverer Suzuki 3 The name Futabasaurus has also been used for an unrelated theropod dinosaur also from the Late Cretaceous of Japan However this dinosaur was not officially named and remains a nomen nudum Classification Edit Pre 2006 skeletal mount which is informally labelled as Wellesisaurus sudzuki with a large stone containing crinoids and ammonites in the background The following cladogram shows the placement of Futabasaurus within Elasmosauridae following an analysis by Rodrigo A Otero 2016 4 Fossils Elasmosauridae Eromangasaurus carinognathusCallawayasaurus colombiensisLibonectes morganiTuarangisaurus keyesiThalassomedon haningtoniCM Zfr 115Hydrotherosaurus alexandraeFutabasaurus suzukiiAristonectinae Kaiwhekea katikiAlexandronectes zealandiensisMorturneria seymourensisAristonectes parvidensAristonectes quiriquinensisElasmosaurinae Terminonatator pointeixensisElasmosaurus platyurusAlbertonectes vanderveldeiStyxosaurus sp Hydralmosaurus serpentinus Styxosaurus snowiiStyxosaurus browniSee also Edit paleontology portalList of plesiosaur genera Timeline of plesiosaur researchReferences Edit O Gorman J P 2016 A Small Body Sized Non Aristonectine Elasmosaurid Sauropterygia Plesiosauria from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids Ameghiniana 53 3 245 268 doi 10 5710 AMGH 29 11 2015 2928 S2CID 133139689 Paul Gregory S 2022 The Princeton Field Guide to Mesozoic Sea Reptiles Princeton University Press p 114 ISBN 9780691193809 a b c d Sato Tamaki Hasegawa Yoshikazu Manabe Makoto 2006 A new elasmosaurid plesiosaur from the Upper Cretaceous of Fukushima Japan Palaeontology 49 3 467 484 doi 10 1111 j 1475 4983 2006 00554 x Otero R A 2016 Taxonomic reassessment of Hydralmosaurus as Styxosaurus new insights on the elasmosaurid neck evolution throughout the Cretaceous PeerJ 4 e1777 doi 10 7717 peerj 1777 PMC 4806632 PMID 27019781 Wikispecies has information related to Futabasaurus Wikimedia Commons has media related to Futabasaurus External links EditFutabasaurus at Dinosaurier Web German This article about a plesiosaur is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Futabasaurus amp oldid 1118090738, wikipedia, wiki, book, books, library,
