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Species transferred from Sphagesaurus to Caipirasuchus (Late Cretaceous sphagesaurid crocodyliforms)



From: Ben Creisler
bcreisler@gmail.com

A new paper in Zootaxa:

FABIANO VIDOI IORI, THIAGO DA SILVA MARINHO, ISMAR DE SOUZA CARVALHO &
ANTONIO CELSO DE ARRUDA CAMPOS (2013)
Taxonomic reappraisal of the sphagesaurid crocodyliform Sphagesaurus
montealtensis from the Late Cretaceous Adamantina Formation of São
Paulo State, Brazil.
Zootaxa 3686 (2): 183–200
doi: http://dx.doi.org/10.11646/zootaxa.3686.2.4
http://zoobank.org/urn:lsid:zoobank.org:pub:9F87DAC0-E2BE-4282-A4F7-86258B0C8668
http://www.mapress.com/zootaxa/2013/f/z03686p200f.pdf

Sphagesaurus montealtensis is a sphagesaurid whose original
description was based on a comparison with Sphagesaurus huenei, the
only species of the clade described to that date. Better preparation
of the holotype and the discovery of a new specimen have allowed the
review of some characteristics and the identification of several
synapomorphies of S. montealtensis with the genus Caipirasuchus:
presence of antorbital fenestra; external nares bordered only by the
premaxillae; premaxilla with four teeth and one diastema (between the
3rd–4th teeth); one diastema between the 4th premaxillary tooth and
the 1st maxillary tooth; dentary with ten teeth and two diastemata
(between the 4th–5th and 5th – 6th teeth); nasal with a groove
parallel to the suture with the frontal bone; nasal long, with an
acute anterior margin touching anterolaterally the premaxilla, jugal
is a straight bar in the lateral view; frontal is longer than wide; a
dorsoventrally expanded and vertically oriented quadrate with a groove
separating the medial and lateral condyles; the frontal has a discrete
sagittal crest; dentary with six posterior sphagesauriform teeth and
four anterior conical teeth, the first three are the smallest of the
series and the fourth is slightly laterally compressed. The referral
of S. montealtensis to the genus Caipirasuchus, as Caipirasuchus
montealtensis comb. nov. is proposed here, based on the new taxonomic
observations and the results of a phylogenetic analysis.