[dinosaur] Montealtosuchus bone histology + sauropterygians + Naomichelys + Cretaceous lizard tracks + more

Ben Creisler
[email protected]

Some recent papers (some with free pdfs):


Paywalled:

Isadora Marchetti, Fresia Ricardi-Branco, Flavia Callefo, Rafael Delcourt,
Douglas Galante, Isabela Jurigan, Ismar S. Carvalho & Sandra A.S. Tavares
(2019)
Fossildiagenesis and ontogenetic insights of crocodyliform bones from the
Adamantina Formation, Bauru Basin, Brazil.
Journal of South American Earth Sciences 96 Article 102327
https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.jsames.2019.102327&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=SqxRf9Ly_VWeAvkhuUWMNaT7aCKpeo_7W83yaLPUUU0&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S0895981119302147&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=YojWuc6GmX2ySvWO3YVdvXj9TkGk2l6_xeiLKVyu88w&e= 


Highlights

Histological analysis of Montealtosuchus allows to understand their
fossildiagenesis.
The histological samples of Montealtosuchus were analyzed with SEM/EDS and
μ-XRF.
The Montealtosuchus fossils bones are in majority composed by calcium and
phosphorus.
Iron, vanadium and cerium were incorporated in the bones of Montealtosuchus
during eodiagenesis.


Abstract

The histological analysis of fossil bones allows a taphonomic approach,
especially to fossildiagenesis. We studied the femur, vertebra, and
osteoderm of the crocodyliform Montealtosuchus arrudacamposi (Adamantina
Formation; Late Cretaceous), to make inferences of the sequence of the
diagenetic processes. Cross-sections of the bones and the rock matrix that
fills the medullar cavity were analyzed under a scanning electron
microscopy with compositional analysis (SEM/EDS) and μ-X-Ray fluorescence
(μ-XRF). The microstructural pattern of the femur and vertebra was similar,
with a transition from vascularized fibrolamellar internal cortex, with
reticular and longitudinal canals to zonal lamellar in the outer, and a
medullary cavity portion filled with quartz and other mineral grains. The
osteoderm, however, presented a less vascularized cortex. In all samples
were found the External Fundamental System (EFS), secondary osteons in the
internal cortex and spongy tissue, and the transition from a fibrolamellar
to a lamellar tissues, indicating that the individual reached ontogenetic
maturity (adult/senescent) before they died. The compositional results
showed that the samples mainly comprised calcium and phosphorus, which were
homogeneously distributed. However, we inferred that these elements
occurred during the formation of recrystallized and authigenic minerals.
Iron, vanadium, and cerium are the elements found that occurred in the
composition of the fossil remains during early diagenesis, and this process
was observed to extend to the late diagenesis. Cerium was homogeneously
distributed and incorporated to authigenic apatite. Iron and vanadium were
restricted to the cortex. The presence of authigenic apatite and Rare Earth
Elements (REEs) in the samples supported that the diagenetic environment of
the Adamantina Formation was alkaline. Furthermore, it suggested an
association with a groundwater environment that have allowed and
facilitated the well preservation of fossil vertebrates in this geological
formation.


===

Free pdf:

Torsten M. Scheyer, Andrew G. Neuman, and Donald B. Brinkman (2019)
A large marine eosauropterygian reptile with affinities to nothosauroid
diapsids from the Early Triassic of British Columbia, Canada.
Acta Palaeontologica Polonica (in press)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.4202_app.00599.2019&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=DURzHoIX_xN8v02oG0ZmcZ0TvnU0GooEZXxanvpMfqI&e= 
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_article_item_app005992019.html&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=KcZIyo9Mcq-7TEBS1CjcQ4R8d5l2mw3X2T-ZYJmDx8M&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_archive_published_app64_app005992019.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=zauY7bxPX_M9NolCpAefoQ6WGBBB_vgeruzfqLKlIrU&e= 


Sauropterygia, one of the main clades of Mesozoic marine reptiles,
diversified shortly after the Permo-Triassic biotic crisis and afterwards
remained one of the major components of Early Triassic and later Mesozoic
marine ecosystems. On the other hand, actual specimens of marine reptiles
of Olenekian age are still rare in the fossil record, coming only from a
few localities worldwide. Here we describe associated remains of a larger
marine reptile of around 4 m body length, with nothosauroidean affinities
from the Sulphur Mountain Formation exposed at the L cirque locality of
Wapiti Lake area in British Columbia. Although the specimen records only
scattered parts of the posterior vertebral column, some gastral ribs and
most notably, the proximal portion of one hind limb together with a
fan-shaped ischium, it represents one of the oldest records of
Sauropterygia and larger representatives of aff. Nothosauroidea
specifically, as well as the northernmost occurrence of such animals in the
Triassic. As such, the new specimen is important for understanding the
biogeography and early evolution of the group and that of Sauropterygia, in
general.
========

Paywalled:

Iván Meza-Vélez & José P. O’Gorman (2019)
First Plesiosaurian record (Diapsida; Sauropterygia) from the La Herradura
Formation, (Valanginian–Hauterivian), Morro Solar, Peru.
Cretaceous Research Article 104247 (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.cretres.2019.104247&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=JRRvjUcNaZODUrQoE6N5VxjyEsLQ1RnGGXX10bYuIlw&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S0195667119301818&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=-QDh2pXeNY3P7iuBwmmzrmCODie8VTAj-uy2R2loVyI&e= 


We report the first plesiosaur remains (Diapsida, Sauropterygia) from Peru,
recovered from Lower Cretaceous rocks cropping out in Morro Solar, within
Lima city (La Herradura Formation, Valanginian–Hauterivian). The material
is restricted to an undetermined propodium, fragmentary vertebrae and
ilium, being identified as a Plesiosauria, with putative affinities to
Leptocleididae or Elasmosauridae. This record provides further data on the
group in the Southeastern Pacific.

=====
Paywalled:


Alexander Lukeneder &  Nikolay Zverkov (2019)
First evidence of a conical-toothed pliosaurid (Reptilia, Sauropterygia) in
the Hauterivian of the Northern Calcareous Alps, Austria.
Cretaceous Research Article 104248 (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.cretres.2019.104248&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=WXK9AcFhAaKJqqC5Ni7VU9zd3AxlHykUm0tVlmfoFCc&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.sciencedirect.com_science_article_pii_S019566711930237X&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=HiDov71V_aiuK6pDZ1wqj30C49VrcfU6h6c2__4FMXg&e= 

Highlights

First evidence of conical-toothed pliosaurids (Reptilia, Sauropterygia) in
the Hauterivian of the Northern Calcareous Alps, Austria.
Isolated tooth crown originates from the upper Hauterivian Balearites
balearis Zone.
Finding sheds light on the diversity and distribution of pliosaurids in the
Lower Cretaceous.
First pliosaur from Austria and the first evidence of Cretaceous
pliosaurids from the entire Alpine arc.

Abstract

The first pliosaurid finding in Austria is described from the Lower
Cretaceous (Hauterivian) pelagic to hemipelagic limestone succession of the
Northern Calcareous Alps (Bajuvaric Langbath Zone). The isolated tooth
crown originates from the upper Hauterivian Balearites balearis Zone
(Balearites angulicostatus Subzone). The finding sheds light on the
diversity and distribution of pliosaurids in the Lower Cretaceous, being
only the second occurrence of conical-toothed pliosaurid in the Hauterivian
worldwide and the first pliosaur from Austria. The pliosaur reported is the
first from the entire northern, central and western Alpine chain, and the
first evidence of Cretaceous pliosaurids from the entire Alpine arc.


=====

Free pdf:

Ariana Paulina-Carabajal, Juliana Sterli, and Ingmar Werneburg (2019)
The endocranial anatomy of the stem turtle Naomichelys speciosa from the
Early Cretaceous of North America.
Acta Palaeontologica Polonica (in press)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.4202_app.00606.2019&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=wdVd8mXng7o-tKf99UwHA1Av9NMa-WQ9dkdiXR6Jow0&e= 
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_article_item_app006062019.html&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=yDgcJUCuC02DM092z4tbZF_RSFIpGU3phr0oXwHPVPE&e= 
Free pdf:
https://urldefense.proofpoint.com/v2/url?u=http-3A__app.pan.pl_archive_published_app64_app006062019.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=iE2DRy_mP22Ajd9N4L4cxiScSO8sIBbSoXpo5_pjw_Q&e= 


Fossil turtles are one of the least studied clades in regard to endocranial
anatomy. Recently, the use of non-invasive technologies, such as
radiographic computed tomography (CT), increased the knowledge of the
neuroanatomy of several extinct and extant taxa. Here, we provide the
description of the nasal cavity, cranial endocast, and inner ear of the
stem turtle Naomichelys speciosa based on digital 3D reconstructions. This
terrestrial form is characterized by a nasal cavity with anteroposteriorly
elongated vestibulum and a large cavum nasi proprium, traits typically
related to terrestrial habits. The large olfactory region of the cavum nasi
proprium suggests that olfaction was probably the most important sense for
this species. Our description of N. speciosa adds novel information to the
knowledge of endocranial anatomy in early turtle evolution and provides an
important foundation for future analyses and comparisons.

======

Free pdf:

Kyung Soo Kim, Jong Deock Lim, Martin G. Lockley, Dong Hee Kim, Laura
Piñuela & Jae Sang Yoo (2019)
Largest Cretaceous lizard track assemblage, new morphotypes and longest
trackways comprise diverse components of an exceptional Korean
Konservat-Lagerstätten ichnofauna.
Scientific Reports 9, Article number: 13278
DOI: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1038_s41598-2D019-2D49442-2D0&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=wJTMku3auD-gFokNMbtz00MoKOV3g3LPWCAVPW0XqvM&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.nature.com_articles_s41598-2D019-2D49442-2D0&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=5z7sx48XY8N09VBl4Pj44eoMs3gEDaMmJQZwn7K6x4A&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.nature.com_articles_s41598-2D019-2D49442-2D0.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=9t76kgeSdYz3UX7Qmy-Vm8iWPy3QOwV-LKljMqkvB-4&e= 

A newly discovered assemblage of lizard tracks from the Lower Cretaceous
Jinju Formation (Sindong Group, Gyeongsang Basin) Korea is the largest yet
reported from the Cretaceous. It consists of at least 95 tracks comprising
five trackways, including a meter-long trackway (T1) with 50 footprints
assigned to the new ichnotaxon Neosauroides innovatus ichnosp. nov. Two
other trackways (T2 and T3) are designated N. innovatus paratypes
characterized by strong heteropody, relatively wide trackways and small
narrow manus tracks. These morphological characteristics distinguish
Neosauroides innovatus from the previously reported lizard trackways
Sauripes hadongensis from the Hasandong Formation and Neosauroides
koreaensis from the Haman Formation, both also from the Gyeongsang Basin.
These three lizard track assemblages from the Korean Cretaceous constitute
the entire global lizard track record for this period. The Mesozoic record
of lizard tracksites is more localized than the lizard body fossil record.
This limited distribution suggests bias in the track record and the fossil
record more generally. However, due to deposition of fine-grained
substrates, suitable for high definition track registration, the Jinju
Formation is increasingly well known as an ichnological window on small
tetrapod activity and based on diversity, abundance and high-quality
preservation, is regarded as an exceptional Konservat-Lagerstätten.

===

Free pdf:

Lotta Salomies, Julia Eymann, Imran Khan & Nicolas Di-Poï (2019)
The alternative regenerative strategy of bearded dragon unveils the key
processes underlying vertebrate tooth renewal.
eLife 8: e47702
doi:  https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.7554_eLife.47702.001&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=7YXoY5Vf8wsQLN0TV9oaZ6ootE9WCwUBar5pjILBEhw&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__elifesciences.org_articles_47702&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=stf_E7ORmE2z65y_L1vxo1PP7PIRfVIdbxLVvarM1Zc&s=7yiQST1qSAjqI-vCRbwldhhgG_NZOHyrAv8QgxpmfRw&e= 

Deep understanding of tooth regeneration is hampered by the lack of
lifelong replacing oral dentition in most conventional models. Here, we
show that the bearded dragon, one of the rare vertebrate species with both
polyphyodont and monophyodont teeth, constitutes a key model for filling
this gap, allowing direct comparison of extreme dentition types. Our
developmental and high-throughput transcriptomic data of microdissected
dental cells unveils the critical importance of successional dental lamina
patterning, in addition to maintenance, for vertebrate tooth renewal. This
patterning process happens at various levels, including directional growth
but also gene expression levels, dynamics, and regionalization, and
involves a large number of yet uncharacterized dental genes. Furthermore,
the alternative renewal mechanism of bearded dragon dentition, with dual
location of slow-cycling cells, demonstrates the importance of cell
migration and functional specialization of putative epithelial
stem/progenitor niches in tissue regeneration, while expanding the
diversity of dental replacement strategies in vertebrates.

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