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Alcovasaurus, new stegosaur from Upper Jurassic, USA (for Stegosaurus longispinus)



Ben Creisler
bcreisler@gmail.com

A new paper. I have used separated url strings to prevent the
rewriting and redirection of the urls.

Galton, Peter M. & Carpenter, Kenneth (2016)
The plated dinosaur Stegosaurus longispinus Gilmore, 1914 (Dinosauria:
Ornithischia; Upper Jurassic, western USA), type species of
Alcovasaurus n. gen.
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 279(2): 185-208
DOI: http: // dx.doi.org/10.1127/njgpa/2016/0551
http: // 
www.ingentaconnect.com/content/schweiz/njbgeol/2016/00000279/00000002/art00005


The plated dinosaur Stegosaurus longispinus came from the Morrison
Formation (Upper Jurassic) near Alcova, Wyoming, USA. Only the femur
and plaster casts of the posterior pair of long dermal tail spines
survived destructive water damage in the 1920s. This surviving
material and archival photographs showing the bones in the quarry and
as exhibited allow us to expand the original description. S.
longispinus Gilmore, 1914 is made the type species of Alcovasaurus n.
gen. as A. longispinus (Gilmore, 1914). Autapomorphies include the
continuation of transverse processes to the distal caudal vertebrae;
distal caudal centra anteroposteriorly short so height exceeds length;
both distal dermal spine pairs with a very long slender shaft at ~90%
of femoral length, and posterior pair widest at 25% of length.
Natronasaurus longispinus was proposed by Ulansky (2014) for S.
longispinus. However this failed to meet the requirements of the
International Code of Zoological Nomenclature, as is also true for 17
other names proposed for basal thyreophorans and stegosaurs.