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Ruberodon, new traversodontid cynodont from Late Triassic of India
A new online paper:
Sanghamitra Ray (2015)
A new Late Triassic traversodontid cynodont (Therapsida, Eucynodontia)
Journal of Vertebrate Paleontology (advance online publication)
A large traversodontid cynodont Ruberodon roychowdhurii, gen et. sp.
nov., is described from the Late Triassic Tiki Formation of the Rewa
Gondwana Basin, India, based on an ontogenetic series of five partial
lower jaws. Ruberodon is characterized by a robust and deep dentary
symphysis, lower dental formula of i3-c1-pc9, procumbent and
hypertrophied first lower incisor, a large canine, long diastema
between the lower canine and first postcanine, and a high coronoid
process at 60° to the horizontal tooth row. With growth, the
symphyseal region became relatively more slender with lengthening of
the diastema. Phylogenetic analysis based on 19 taxa and 35
craniodental characters places Ruberodon within the clade containing
Gomphodontosuchus, Menadon, Protuberum, Scalenodontoides, and the
multispecific Exaeretodon. The new genus forms a sister taxon to E.
statisticae and is more advanced than E. riograndensis and E.
argentinus based on the presence of a strong coronoid ridge anterior
to the masseteric fossa. Based on its tetrapod assemblage, the Tiki
Formation may be globally correlated with other formations such as the
lower part of the Maleri Formation of India, the Isalo II Beds of
Madagascar, and the upper part of the Santa Maria Formation of Brazil.
An early Carnian age is proposed for the Tiki Formation.