scholarly journals A new nodosaurid ankylosaur (Dinosauria: Thyreophora) from the Upper Cretaceous Menefee Formation of New Mexico

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5435 ◽  
Author(s):  
Andrew T. McDonald ◽  
Douglas G. Wolfe
Keyword(s):  
New Mexico ◽  
Fossil Record ◽  
Upper Cretaceous ◽  
New Genus ◽  
Western United States ◽  
Unique Combination ◽  
New Genus And Species ◽  
San Juan Basin ◽  
History Of ◽  
Lower Campanian

Nodosauridae is a clade of armored dinosaurs with a rich fossil record and long history of study in North America. Nodosaurid fossils have been collected throughout the western United States and Canada. Here, we report three new nodosaurid specimens from the Upper Cretaceous (lower Campanian) Allison Member of the Menefee Formation, San Juan Basin, northwestern New Mexico. The three specimens belong to a new genus and species,Invictarx zephyri, characterized by a unique combination of features pertaining to the morphology of the osteoderms. Among the three specimens there are representative cervical/pectoral and thoracic osteoderms, as well as components of a probable co-ossified pelvic shield. The new tax on is most similar toGlyptodontopelta mimusfrom the Maastrichtian of New Mexico.

Terlinguachelys fischbecki, a new genus and species of sea turtle (Chelonioidea: Protostegidae) from the Upper Cretaceous of Texas

2004 ◽  
Vol 78 (6) ◽  
pp. 1163-1178 ◽  
Author(s):  
Thomas M. Lehman ◽  
Susan L. Tomlinson
Keyword(s):  
National Park ◽  
Upper Cretaceous ◽  
New Genus ◽  
Sea Turtles ◽  
Sea Turtle ◽  
Unique Combination ◽  
New Genus And Species ◽  
Big Bend National Park ◽  
Big Bend ◽  
Lower Jaw

Remains of a large sea turtle, Terlinguachelys fischbecki n. gen. and sp., were recovered from paralic deposits of the Upper Cretaceous (Campanian) Aguja Formation in Big Bend National Park, Texas. T. fischbecki is a primitive protostegid that retains a constricted humerus, well ossified plastron and costals, prominent retroarticular process on the lower jaw, and long slender femora; however, it has some features, such as a prominent tubercle at the base of the scapular acromion process, found elsewhere only in derived leatherback sea turtles. The unique combination of primitive and derived traits in T. fischbecki illustrates further diversity among Cretaceous sea turtles and another case of parallelism common in sea turtle phylogeny.

scholarly journals Brittle stars looking like starfish: the first fossil record of the Astrophiuridae and a remarkable case of convergent evolution

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e8008
Author(s):  
Ben Thuy ◽  
Andy Gale ◽  
Lea Numberger-Thuy
Keyword(s):  
Fossil Record ◽  
Upper Cretaceous ◽  
New Genus ◽  
Parallel Evolution ◽  
Molecular Evidence ◽  
New Genus And Species ◽  
Brittle Stars ◽  
Remarkable Case ◽  
The Family ◽  
A New Species

The genus Astrophiura, which ranks among the most extraordinary of modern brittle stars, is the type genus of the recently resurrected family Astrophiuridae within the order Ophiurida. On account of its absurdly enlarged and strongly modified lateral arm plates, Astrophiura bears a closer resemblance to a pentagonal starfish than to a typical ophiuroid. Although molecular evidence suggests an ancient origin of the Astrophiuridae, dating back at least to the Early Jurassic, not a single fossil astrophiurid has been reported so far. Here, we describe dissociated lateral arm plates from the Campanian of Cringleford near Norwich, UK, and the Maastrichtian of Rügen, Germany (both Upper Cretaceous) with unambiguous astrophiurid affinities and assign these to a new species, Astrophiura markbeneckei. This represents the first fossil record of the family. In addition, the Rügen material included lateral arm plates that superficially resemble those of A. markbeneckei sp. nov. but differ in having spine articulations that are typical of the ophionereidoid family Amphilimnidae. We assign these plates to a new genus and species, Astrosombra rammsteinensis, an extinct amphilimnid with morphological modifications similar to those of Astrophiura, and thus representing a remarkable case of parallel evolution amongst brittle stars looking like starfish.

A feather from the Upper Cretaceous (lower Campanian) Point Lookout Sandstone, San Juan Basin, northwestern New Mexico

2009 ◽  
Vol 30 (3) ◽  
pp. 547-550 ◽  
Author(s):  
T.E. Williamson ◽  
B.S. Kues ◽  
G.S. Weissmann ◽  
T.A. Stidham ◽  
S.L. Yurchyk
Keyword(s):  
New Mexico ◽  
Upper Cretaceous ◽  
San Juan ◽  
San Juan Basin ◽  
Lower Campanian

Glishades ericksoni, a new hadrosauroid (Dinosauria: Ornithopoda) from the Late Cretaceous of North America

Zootaxa ◽  
2010 ◽  
Vol 2452 (1) ◽  
pp. 1 ◽  
Author(s):  
ALBERT PRIETO-MÁRQUEZ
Keyword(s):  
United States Of America ◽  
Upper Cretaceous ◽  
New Genus ◽  
Ventral Surface ◽  
The United States ◽  
Maximum Parsimony Analysis ◽  
Unique Combination ◽  
Parsimony Analysis ◽  
New Genus And Species ◽  
Parasagittal Plane

A new genus and species of hadrosauroid dinosaur, Glishades ericksoni, is described based on paired partial premaxillae collected from the Upper Cretaceous Two Medicine Formation of Montana, in the Western Interior of the United States of America. This taxon is diagnosed on the basis of a unique combination of characters: absence of everted oral margin, arcuate oral margin with wide and straight, obliquely oriented, and undeflected anterolateral corner, grooved transversal thickening on ventral surface of premaxilla posterior to denticulate oral margin, and foramina on anteromedial surface above oral edge and adjacent to proximal end of narial bar. Maximum parsimony analysis positioned G. ericksoni as a derived hadrosauroid. Exclusion of G. ericksoni from Hadrosauridae was unambiguously supported by the lack in AMNH 27414 of a dorsomedially reflected premaxillary oral margin. Furthermore, the maximum agreement subtree positioned G. ericksoni as the sister taxon to Bactrosaurus johnsoni. This position was unambiguously supported by posteroventral thickening on the ventral surface of the premaxilla (independently derived in saurolophid hadrosaurids and Ouranosaurus nigeriensis) and having foramina on each premaxilla on the anterior surface, adjacent to the parasagittal plane of the rostrum (reconstructed as independently derived in Brachylophosaurus canadensis, Maiasaura peeblesorum, and Edmontosaurus annectens).

scholarly journals A new tyrannosaurid (Dinosauria: Theropoda) from the Upper Cretaceous Menefee Formation of New Mexico

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5749 ◽  
Author(s):  
Andrew T. McDonald ◽  
Douglas G. Wolfe ◽  
Alton C. Dooley
Keyword(s):  
New Mexico ◽  
Laser Scanning ◽  
Upper Cretaceous ◽  
Early Evolution ◽  
Growth Stages ◽  
Appendicular Skeleton ◽  
Apex Predators ◽  
New Genus And Species ◽  
Cretaceous Period ◽  
Lower Campanian

The giant tyrannosaurids were the apex predators of western North America and Asia during the close of the Cretaceous Period. Although many tyrannosaurid species are known from numerous skeletons representing multiple growth stages, the early evolution of Tyrannosauridae remains poorly known, with the well-known species temporally restricted to the middle Campanian-latest Maastrichtian (∼77–66 Ma). The recent discovery of a new tyrannosaurid,Lythronax argestes, from the Wahweap Formation of Utah provided new data on early Campanian (∼80 Ma) tyrannosaurids. Nevertheless, the early evolution of Tyrannosauridae is still largely unsampled. We report a new tyrannosaurid represented by an associated skeleton from the lower Campanian Allison Member of the Menefee Formation of New Mexico. Despite fragmentation of much of the axial and appendicular skeleton prior to discovery, the frontals, a metacarpal, and two pedal phalanges are well-preserved. The frontals exhibit an unambiguous autapomorphy and a second potential autapomorphy that distinguish this specimen from all other tyrannosaurids. Therefore, the specimen is made the holotype of the new genus and speciesDynamoterror dynastes. A phylogenetic analysis placesDynamoterror dynastesin the tyrannosaurid subclade Tyrannosaurinae. Laser-scanning the frontals and creation of a composite 3-D digital model allows the frontal region of the skull roof ofDynamoterrorto be reconstructed.

scholarly journals The first xiphydriid wood wasp in Cretaceous amber (Hymenoptera: Xiphydriidae) and a potential association with Cycadales

Fossil Record ◽  
2022 ◽  
Vol 24 (2) ◽  
pp. 445-453
Author(s):  
Jia Gao ◽  
Michael S. Engel ◽  
Friðgeir Grímsson ◽  
Lei Gu ◽  
Dong Ren ◽  
...  
Keyword(s):  
Fossil Record ◽  
New Genus ◽  
Life Science ◽  
Cylindrical Body ◽  
Wing Venation ◽  
Unique Combination ◽  
New Genus And Species ◽  
Potential Association ◽  
The Family ◽  
First Occurrence

Abstract. A new genus and species of fossil wood wasp is described and figured from mid-Cretaceous Kachin amber, representing the first occurrence of the family Xiphydriidae in the fossil record. Paraxiphydria resinata gen. et sp. nov. exhibits typical apomorphies of the family including a generally cylindrical body, elongate neck and dome-shaped head. Nonetheless, owing to a unique combination of traits including features hitherto unknown among species of the family, the genus is classified within a separate subfamily, Paraxiphydriinae subfam. nov. A key is presented to the suprageneric groups of Xiphydriidae. The newly described species is the first fossil xiphydriid wood wasp, extends the occurrence of Xiphydriidae into the mid-Cretaceous and adds to the known diversity of features in the family. Lastly, the simplification of wing venation and hypotheses of host-plant affiliations of early xiphydriids are discussed. We evaluate pollen associated with the wasp, assign it to the genus Cycadopites and conclude that an affiliation to the Cycadales is most likely. Article and nomenclatural acts are registered in ZooBank (http://zoobank.org/, last access: 15 December 2021), with the following life science identifier (LSID) (reference): urn:lsid:zoobank.org:pub:DA80920E-E94B-4A8E-A817-077FA7BD7D69.

CLIMATIC AND DEPOSITIONAL HISTORY OF THE LOWER PALEOCENE UPPER NACIMIENTO FORMATION, SAN JUAN BASIN, NEW MEXICO

2016 ◽  
Author(s):  
Caitlin E. Leslie ◽  
◽  
Ross Secord ◽  
Daniel J. Peppe ◽  
Stacy Atchley ◽  
...  
Keyword(s):  
New Mexico ◽  
San Juan ◽  
Depositional History ◽  
San Juan Basin ◽  
History Of

HISTORY OF COAL BED METHANE IN THE SAN JUAN BASIN, COLORADO AND NEW MEXICO

2017 ◽  
Author(s):  
Paul Oldaker ◽  
Keyword(s):  
New Mexico ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
San Juan ◽  
San Juan Basin ◽  
History Of
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