Nichollssaura Explained

Nichollssaura is an extinct genus of leptocleidid[1] plesiosaur from the Early Cretaceous Boreal Sea of North America. The type species is N. borealis, found in the early Albian age Clearwater Formation near Fort McMurray, Alberta, Canada.[2]

Taxonomy

The fossil, named after paleontological curator Dr. Betsy Nicholls, originally was named Nichollsia borealis[3] but Nichollsia was already in use (preoccupied) by a genus of isopods. Thus, the original authors proposed Nichollssaura as a replacement generic name in 2009.[4]

Description

Nichollssaura was a small plesiosaur, reaching in length and in body mass.[5] [6] [7] It fills an approximate 40-million-year gap in the fossil record of North American plesiosaurs.

The type specimen was discovered in one of Syncrude Canada Ltd.'s open-pit oilsand mines near Fort McMurray, Alberta, in 1994. The fossil is on display at the Royal Tyrrell Museum of Palaeontology, missing only the left forelimb and scapula, lost when the specimen was discovered accidentally by 100-ton electric shovel operators Greg Fisher and Lorne Cundal.[8]

Classification

Nichollssaura in a cladogram based on Ketchum and Benson (2011):[9]

See also

External links

Notes and References

  1. Ketchum, H. F. . Benson, R. B. J. . amp . 2010 . Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses . Biological Reviews. 20002391 . 85. 2 . 361–392 . 10.1111/j.1469-185X.2009.00107.x. 12193439 .
  2. Web site: A one-in-a-billion dinosaur find. The Guardian. Henderson, D.. 2013. 2013-11-21.
  3. Druckenmiller, P.S. . Russell, A.P. . 2008 . Skeletal anatomy of an exceptionally complete specimen of a new genus of plesiosaur from the Early Cretaceous (Early Albian) of northeastern Alberta, Canada . Palaeontographica Abteilung A . 283 . 1–3 . 1–33 . 10.1127/pala/283/2008/1 .
  4. Druckenmiller . Patrick S. . Russell, Anthony P. . 2009 . The new plesiosaurian genus Nichollssaura from Alberta, Canada: replacement name for the preoccupied genus Nichollsia . Journal of Vertebrate Paleontology . 29 . 1 . 276 . 10.1080/02724634.2009.10010379. 83847722 .
  5. Valentin Fischer . Nikolay G. Zverkov . Maxim S. Arkhangelsky . Ilya M. Stenshin . Ivan V. Blagovetshensky . Gleb N. Uspensky . 2020 . A new elasmosaurid plesiosaurian from the Early Cretaceous of Russia marks an early attempt at neck elongation . Zoological Journal of the Linnean Society . 192 . 4 . 1167–1194 . 10.1093/zoolinnean/zlaa103 . 2268/251614 . Supplementary Information
  6. Book: Paul, Gregory S.. 2022. The Princeton Field Guide to Mesozoic Sea Reptiles. 119. 9780691193809. Princeton University Press.
  7. Benson . R. B. J. . Ketchum . H. F. . Naish . D. . Turner . L. E. . A new leptocleidid (Sauropterygia, Plesiosauria) from the Vectis Formation (Early Barremian–early Aptian; Early Cretaceous) of the Isle of Wight and the evolution of Leptocleididae, a controversial clade . 10.1080/14772019.2011.634444 . Journal of Systematic Palaeontology . 233–250 . 2012 . 11 . 2 . 18562271 .
  8. Web site: PALAEOBLOG. palaeoblog.blogspot.com. 20 March 2008.
  9. Ketchum . Hilary F. . Benson . R. B. J. . A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early-Middle Jurassic pliosaurids . Special Papers in Palaeontology . 2011 . 86 . 109–129 .

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