[dinosaur] Tanzanian dicynodonts + geoemydid turtle phylogeny (free pdfs)

Ben Creisler
[email protected]


New non-dino papers with free pdfs:

Free pdf:

Dicynodon angielczyki sp. nov.
Daptocephalus huenei comb. nov.


Christian F. Kammerer (2019)
Revision of the Tanzanian dicynodont Dicynodon huenei (Therapsida:
Anomodontia) from the Permian Usili Formation.
PeerJ 7:e7420
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.7717_peerj.7420&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=vTxJLBmw-OIolE5bJFFKVYsvQeNRpWxxostGJVexNCs&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__peerj.com_articles_7420_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=rMVZXiMszL84Z2HrzKkU3Tj9Hnh4z2SGELG_IBoa3Yo&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__peerj.com_articles_7420.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=b23xrmZKnJ8GvvxleOoaeFsRzXs3M4fjqxWX4EaCAkM&e= 


A single species of the dicynodontoid dicynodont Dicynodon is currently
recognized from the late Permian Usili Formation of Tanzania: Dicynodon
huenei Haughton, 1932. Restudy of the known Tanzanian materials of D.
huenei demonstrates that they represent two distinct morphotypes, here
considered separate taxa. The holotype of D. huenei is not referable to
Dicynodon and instead is transferred to the genus Daptocephalus (but
retained as a valid species, Daptocephalus huenei comb. nov.). A number of
published dicynodontoid specimens from the Usili Formation, however, are
referable to Dicynodon, and are here recognized as a new species (Dicynodon
angielczyki sp. nov.) Dicynodon angielczyki can be distinguished from its
South African congener Dicynodon lacerticeps by the presence of an
expansion of the squamosal and jugal beneath the postorbital bar and a
curved, posterolateral expansion of the squamosal behind the temporal
fenestra. Inclusion of Dicynodon angielczyki and D. huenei in a
phylogenetic analysis supports their referral to Dicynodon and
Daptocephalus (respectively). These results indicate higher basinal
endemism in large late Permian dicynodonts than previously thought, a sharp
contrast to the cosmopolitanism in the group in the earliest Triassic.

====

Free pdf:

Eduardo Ascarrunz, Julien Claude & Walter G. Joyce (2019)
Estimating the phylogeny of geoemydid turtles (Cryptodira) from landmark
data: an assessment of different methods.
PeerJ 7:e7476
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.7717_peerj.7476&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=Oe-JFgVGoc5MJFQR9axdW36lRGYa38VyNHnzygRZN7k&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.7717_peerj.7476&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=Oe-JFgVGoc5MJFQR9axdW36lRGYa38VyNHnzygRZN7k&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__peerj.com_articles_7476.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=G_xI5aJKi6yV5-01aHSSJBky7cHRm642UxfA4-x1bhI&e= 

Background

In the last 20 years, a general picture of the evolutionary relationships
between geoemydid turtles (ca. 70 species distributed over the Northern
hemisphere) has emerged from the analysis of molecular data. However, there
is a paucity of good traditional morphological characters that correlate
with the phylogeny, which are essential for the robust integration of
fossil and molecular data. Part of this problem might be due to intrinsic
limitations of traditional discrete characters. Here, we explore the use of
continuous data in the form of 3D coordinates of homologous landmarks on
the turtle shell for phylogenetic inference and the phylogenetic placement
of single species on a scaffold molecular tree. We focus on the performance
yielded by sampling the carapace and/or plastral lobes and using various
phylogenetic methods.

Methods

We digitised the landmark coordinates of the carapace and plastron of 42
and 46 extant geoemydid species, respectively. The configurations were
superimposed and we estimated the phylogenetic tree of geoemydids with
landmark analysis under parsimony, traditional Farris parsimony, unweighted
squared-change parsimony, maximum likelihood with a Brownian motion model,
and neighbour-joining on a matrix of pairwise Procrustes distances. We
assessed the performance of those analyses by comparing the trees against a
reference phylogeny obtained from seven molecular markers. For comparisons
between trees we used difference measures based on quartets and splits. We
used the same reference tree to evaluate phylogenetic placement performance
by a leave-one-out validation procedure.

Results

Whatever method we used, similarity to the reference phylogeny was low. The
carapace alone gave slightly better results than the plastron or the
complete shell. Assessment of the potential for placement of single species
on the reference tree with landmark data gave much better results, with
similar accuracy and higher precision compared to the performance of
discrete characters with parsimony.
=========

Correction:

Jonathan P. Rio, Philip D. Mannion, Emanuel Tschopp, Jeremy E. Martin &
Massimo Delfino (2019)
Reappraisal of the morphology and phylogenetic relationships of the
alligatoroid crocodilian Diplocynodon hantoniensis from the late Eocene of
the United Kingdom.
Zoological Journal of the Linnean Society, zlz075
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1093_zoolinnean_zlz075&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=Vg-KlyT-wGfLhkjEvQcYB8a3dggsvQSAwYRmWE5cB0E&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__academic.oup.com_zoolinnean_advance-2Darticle_doi_10.1093_zoolinnean_zlz075_5553066&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=l5Sig9NpzD5OFVKS5eY4-1aw1DmqzV4THQRsFNOZNxc&s=fyZnYgwNDOr7DjppecE61mFJOmhzSvC03t3wf48XqyA&e= 


The originally published version of this manuscript was missing the
following reference. This has now been corrected.

Blanco A, Fortuny J, Vicente A, Luján AH, García-Marçà JA, Sellés A. 2015.
A new species of Allodaposuchus (Eusuchia, Crocodylia) from the
Maastrichtian (Late Cretaceous) of Spain: phylogenetic and paleobiological
implications. PeerJ 3: e1171.

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