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| DATE | 2017-06-22 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [Learn] Fwd: [dinosaur] CT virtual reexamination of plesiosaur from
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From learn-bounces-at-nylxs.com Thu Jun 22 22:27:46 2017
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Subject: [Learn] Fwd: [dinosaur] CT virtual reexamination of plesiosaur from
Morocco
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Ben Creisler
bcreisler-at-gmail.com
A new paper:
R=C3=A9mi Allemand, Nathalie Bardet, Alexandra Houssaye & Peggy Vincent (20=
17)
Virtual reexamination of a plesiosaurian specimen (Reptilia, Plesiosauria)
from the Late Cretaceous (Turonian) of Goulmima, Morocco, using computed
tomography.
Journal of Vertebrate Paleontology Article: e1325894
doi:
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__dx.doi.org_10.1080_02=
724634.2017.1325894&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc=
_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3D5P73v8ObgjicpGvlEyf=
lqWolZLHOlSi7nrg3Z7p7vA0&s=3DYBqzW1o90HZl6GNMR3_OYNy7UtRpXHWIqdtzwtb8d4s&e=
=3D
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.tandfonline.com_d=
oi_full_10.1080_02724634.2017.1325894&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU=
5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3D5=
P73v8ObgjicpGvlEyflqWolZLHOlSi7nrg3Z7p7vA0&s=3Dw79ev39Jgrire2hwt6qL_7IOjrnI=
1V2OIlMYZDeN17M&e=3D
Turonian deposits of the Goulmima area, Er-Rachidia Province in southern
Morocco, have yielded a diverse marine vertebrate fauna, including
chondrichthyans, bony fishes, and large marine reptiles such as
plesiosaurians, mosasauroids, and turtles. These fossils are included in
ovoid calcareous nodules that are difficult to prepare. Moreover, bones may
be partially or totally dissolved, making their study difficult. Using
computed tomography, we have reconstructed the entire skull anatomy of SMNS
81783, one of the rare plesiosaurian specimens found in this locality and
more generally in Africa. The digital three-dimensional reconstruction of
the skull and the mandible offers for the first time the possibility to
describe this specimen exhaustively. The new anatomical characters recorded
confirm that SMNS 81783 belongs to Elasmosauridae on the basis of (1)
slender and triangular skull; (2) beak index equal to 42%; (3) temporal
fossa estimated to occupy about 40% of the skull length; (4) long process
of the premaxillae extending posteriorly to meet the parietal above the
orbit and separating the frontals; and (5) margin of the temporal fenestra
lacking obvious contribution from the frontal. A preliminary phylogenetic
analysis confirms its elasmosaurid affinity. The relationships between SMNS
81783, Libonectes atlasense, and Libonectes morgani, as well as the
presence of stapes and pineal foramen, are discussed.
SUPPLEMENTAL DATA=E2=80=94Supplemental materials are available for this art=
icle for
free at www.tandfonline.com/UJVP
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