10.5061/DRYAD.TP802
DeMar, David G.
University of Washington
Conrad, Jack L.
New York Institute of Technology
Head, Jason J.
University of Cambridge
Varricchio, David J.
Montana State University
Wilson, Gregory P.
University of Washington
Data from: A new Late Cretaceous iguanomorph from North America and the
origin of New World Pleurodonta (Squamata, Iguania)
Dryad
dataset
2016
Iguanomorpha
Pleurodonta
Palaeogene
Palaeocene
Magnuviator ovimonsensis
Eocene
National Science Foundation
https://ror.org/021nxhr62
0847777 and 1325674
2016-12-22T13:53:09Z
2016-12-22T13:53:09Z
en
https://doi.org/10.1098/rspb.2016.1902
39520020 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Iguanomorpha (stem + crown Iguania) is a diverse squamate clade with
members that predominate many modern American lizard ecosystems. However,
the temporal and palaeobiogeographic origins of its constituent crown
clades (e.g. Pleurodonta (basilisks, iguanas, and their relatives)) are
poorly constrained, mainly due to a meagre Mesozoic-age fossil record.
Here, we report on two nearly complete skeletons from the Late Cretaceous
(Campanian) of North America that represent a new and relatively
large-bodied and possibly herbivorous iguanomorph that inhabited a
semi-arid environment. The new taxon exhibits a mosaic of anatomical
features traditionally used in diagnosing Iguania and non-iguanian
squamates (i.e. Scleroglossa; e.g. parietal foramen at the frontoparietal
suture, astragalocalcaneal notch in the tibia, respectively). Our
cladistic analysis of Squamata revealed a phylogenetic link between
Campanian-age North American and East Asian stem iguanomorphs (i.e. the
new taxon + Temujiniidae). These results and our evaluation of the
squamate fossil record suggest that crown pleurodontans were restricted to
the low-latitude Neotropics prior to their early Palaeogene first
appearances in the mid-latitudes of North America.
ESM Video 1_MOR 7042 rollThis is a video of a three-dimensional model of
the skull of Magnuviator ovimonsensis (MOR 7042).ESM Video 2_MOR 7042
yawThis is a video of a three-dimensional model of the skull of
Magnuviator ovimonsensis (MOR 7042).ESM Video 3_MOR 7042 pitchThis is a
video of a three-dimensional model of the skull of Magnuviator
ovimonsensis (MOR 7042).ESM Video 4_MOR 7042 braincase rollThis is a video
of a three-dimensional model of the braincase of Magnuviator ovimonsensis
(MOR 7042).ESM Video 5_MOR 7042 braincase yawThis is a video of a
three-dimensional model of the braincase of Magnuviator ovimonsensis (MOR
7042).ESM Video 6_MOR 7042 braincase pitchThis is a video of a
three-dimensional model of the braincase of Magnuviator ovimonsensis (MOR
7042).ESM Video 7_MOR 7042 snout rollThis is a video of a
three-dimensional model of the snout of Magnuviator ovimonsensis (MOR
7042).ESM Video 8_MOR 7042 snout yawThis is a video of a three-dimensional
model of the snout of Magnuviator ovimonsensis (MOR 7042).ESM Video 9_MOR
7042 snout pitchThis is a video of a three-dimensional model of the snout
of Magnuviator ovimonsensis (MOR 7042).DeMar et al._ESM file S1This file
contains supplementary text and 14 supplementary figures. The
supplementary text provides (i) supplementary morphological descriptions;
(ii) methodology on estimating squamate body-sizes; (iii) interpretations
of the palaeoenvironmental setting of Magnuviator ovimonsensis and other
relevant fossil iguanomorphs; (iv) new systematic interpretations of Late
Cretaceous lizards previously assigned to Pleurodonta; (v) cladistic
analysis methodologies and results; (vi) character scorings of Magnuviator
ovimonsensis and Pariguana lancensis; (vii) information regarding CT and
µCT scans; and (viii) a complete strict consensus tree and apomorphy list
derived from our morphology-based cladistic analysis. The supplementary
figures show additional specimen images, cladograms, and comparative
body-size estimates of fossil and extant lizards. The text provides
background information for interpretations made in the manuscript.DeMar et
al_ESM file S1.pdfDeMar_et_al._ESM_file_S2This file contains two tables:
Table 1 includes skull, snout-vent length, and total body length
measurements of fossil lizards. Table 2 provides a range of snout-vent
lengths for extant adult iguanians.
South America
Montana
Asia
North America