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Baryonyx from Portugal



From: Ben Creisler
bh480@scn.org


New in Zootaxa:

OCTÁVIO MATEUS, RICARDO ARAÚJO, CARLOS NATÁRIO & RUI CASTANHINHA (2011)
A new specimen of the theropod dinosaur Baryonyx from the early Cretaceous 
of Portugal and taxonomic validity of Suchosaurus.  
Zootaxa 2827: 54?68   (2011) 
http://www.mapress.com/zootaxa/2011/f/z02827p068f.pdf

Although the Late Jurassic of Portugal has provided abundant dinosaur
fossils, material from the Early Cretaceous is scarce. This paper reports
new cranial and postcranial material of the theropod dinosaur Baryonyx
walkeri found in the Barremian (Papo Seco Formation) of Portugal. This
specimen, found at Praia das Aguncheiras, Cabo Espichel, consists of a
partial dentary, isolated teeth, pedal ungual, two calcanea, presacral and
caudal vertebrae, fragmentary pubis, scapula, and rib fragments. It
represents the most complete spinosaurid yet discovered in the Iberian
Peninsula and the most complete dinosaur from the Early Cretaceous of
Portugal. This specimen is confidently identified as a member of
Baryonychinae due to the presence of conical teeth with flutes and
denticles in a dentary rosette. The specimen ML1190 shares the following
characteristics with Baryonyx walkeri: enamel surface with small (nearly
vertical) wrinkles, variable denticle size along the carinae, 6?7 denticles
per mm, wrinkles forming a 45 degree angle near the carinae, and tooth root
longer than crown. In addition, dubious taxa based on teeth morphology such
as Suchosaurus cultridens (Owen, 1840?1845), and Suchosaurus girardi
(Sauvage 1897?98; Antunes & Mateus 2003) are discussed, based on
comparisons with well-known material such as Baryonyx walkeri Charig &
Milner, 1986. Suchosaurus cultridens and S. girardi are considered as
nomina dubia due to the lack of diagnostic apomorphies, but both specimens
are referred to Baryonychinae incertae sedis. 



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