The ‘duck-billed’ dinosaurs of Careless Creek (Upper Cretaceous of Montana, USA), with comments on hadrosaurid ontogeny

2016 ◽  
Vol 90 (1) ◽  
pp. 133-146 ◽  
Author(s):  
Albert Prieto-Márquez ◽  
Susana Gutarra
Keyword(s):  
New Species ◽  
Upper Cretaceous ◽  
Phylogenetic Analyses ◽  
Skeletal Growth ◽  
South Central ◽  
The Common ◽  
Growth Changes ◽  
Central Montana ◽  
Judith River Formation ◽  
A New Species

AbstractThe Careless Creek Quarry (CCQ) is a multitaxic bonebed in the Campanian Judith River Formation of south-central Montana (USA) that produced a diverse assemblage of vertebrates, including several dinosaurian clades. We describe the morphology of the CCQ hadrosaurid material and reevaluate its taxonomic affinities. Our osteological comparative observations, coupled with maximum parsimony phylogenetic analyses, indicate that the majority of the hadrosaurid material is referable to kritosaurin saurolophines. Only an ischium is unambiguously referable to Lambeosaurinae. Most of the kritosaurin specimens likely represent a taxon that forms a polytomy with species of Gryposaurus and Rhinorex condrupus Gates and Sheetz, 2015. This form may represent individuals of either G. latidens Horner, 1992 or G. notabilis Lambe, 1914, or a new species cogeneric or not with Gryposaurus. The juvenile material exemplifies several patterns of mandibular and appendicular osteological variation previously observed in other hadrosaurids. However, it also shows some departures from the common trends, supporting the fact that not all skeletal growth changes can be generalized to all hadrosaurids.

A new species of Limnonectes (Amphibia: Anura: Dicroglossidae) from Vietnam

Zootaxa ◽  
2020 ◽  
Vol 4894 (3) ◽  
pp. 387-402
Author(s):  
CUONG THE PHAM ◽  
DANG TRONG DO ◽  
MINH DUC LE ◽  
HANH THI NGO ◽  
LUAN THANH NGUYEN ◽  
...  
Keyword(s):  
New Species ◽  
Phylogenetic Analyses ◽  
Dorsal Surface ◽  
Ventral Surface ◽  
Diagnostic Characters ◽  
South Central ◽  
Central Vietnam ◽  
Medial Edge ◽  
A New Species

A new species of Limnonectes from Phu Yen Province, South-central Vietnam is described based on morphological and molecular differences. Morphologically, the new species is distinguishable from its congeners on the basis of a combination of the following diagnostic characters: SVL 49.8–77.9 mm in males, 40.8–61.8 mm in females; males with moderately enlarged head (HL/SVL 0.47, HW/SVL 0.48); head slightly broader than long (HL/HW 0.97 in males, 0.95 in females); vomerine teeth present; external vocal sacs absent; rostral length short (RL/SVL 0.15); tympanum invisible; dorsal surface of head, body and flanks with ridges and tubercles; dorsal surface of tibia and foot distinctly tuberculate, covered with moderately dense, small, low tubercles; supratympanic fold present; dorsolateral fold absent; Finger I with nuptial pad, composed of minute spines on dorsal surface and medial edge in males; toes webbed to distal of terminal phalanx, webbing formula I0–0II0–0III0–0IV0-–0V0; in life, dorsum yellowish brown with dark brown markings; ventral surface white with brown markings. In phylogenetic analyses, the new species from Vietnam and Limnonectes fastigatus as well as L. kiziriani form a clade, which is sister to L. fragilis from China, although the nodal support values for the set of relationships are insignificant from all analyses. 

A new species of the genus Sovia Evans, 1949 from South Central Yunnan, China (Lepidoptera, Hesperiidae)

Zootaxa ◽  
2020 ◽  
Vol 4731 (4) ◽  
pp. 565-573
Author(s):  
SI-YAO HUANG ◽  
XIN-YUE WANG ◽  
XIAO-LING FAN
Keyword(s):  
New Species ◽  
Related Species ◽  
Male Genitalia ◽  
Yunnan Province ◽  
Phylogenetic Analyses ◽  
South Central ◽  
Molecular Phylogenetic ◽  
Southward Extension ◽  
A New Species ◽  
General Appearance

A new species of the genus Sovia Evans, 1949, viz. S. liuzihaoi Huang & Fan sp. nov. is described from Mt. Ailao, Xinping Yi and Dai Autonomous County, representing a remarkable geographically southward extension of this genus in Yunnan Province, Southwestern China. In general appearance S. liuzihaoi Huang & Fan sp. nov. resembles S. separata magna (Evans, 1932), but in our molecular phylogenetic analyses, this species is clustered with S. lii Xue, 2015. The adults and male genitalia of the new species and related species are illustrated. 

A new species of Purgatorius (Mammalia; Primatomorpha) from the Lower Paleocene Bear Formation, Crazy Mountains Basin, south-central Montana

1997 ◽  
Vol 71 (1) ◽  
pp. 149-155 ◽  
Author(s):  
Gregory A. Buckley
Keyword(s):  
New Species ◽  
South Central ◽  
Central Montana ◽  
A New Species

Purgatorius titusi, represented by 51 teeth and jaw fragments, is described from the lower Paleocene Bear Formation of the Crazy Mountains Basin in south-central Montana. Several synapomorphies, including a weak postprotocingulum and mesial inflection of molar trigonids, are indicative of the taxon's “plesiadapiform” affinities. Other features, such as wider stylar shelf and a less squared lingual outline on upper molars, are more primitive than those of Purgatorius unio, heretofore the earliest occurring species of well-represented primatomorphs.

scholarly journals Molecular data reveal a new species of Rhopalias Stiles & Hassall, 1898 (Digenea, Echinostomatidae) in the Common opossum, Didelphis marsupialis L. (Mammalia, Didelphidae) in the Yucatán Peninsula, Mexico

ZooKeys ◽  
2019 ◽  
Vol 854 ◽  
pp. 145-163 ◽  
Author(s):  
Jorge López-Caballero ◽  
Rosario Mata-López ◽  
Gerardo Pérez-Ponce de León
Keyword(s):  
New Species ◽  
Genetic Divergence ◽  
Phylogenetic Analyses ◽  
Yucatan Peninsula ◽  
Molecular Data ◽  
Morphological Evidence ◽  
Data Set ◽  
Yucatán Peninsula ◽  
The Common ◽  
A New Species

A new species of Rhopalias Stiles & Hassall, 1898 is described from the small intestine of the Common opossum, Didelphismarsupialis Linnaeus from the Yucatán Peninsula, Mexico. Rhopaliasoochisp. nov. is morphologically very similar to the type species of the genus, Rhopaliascoronatus (Rudolphi, 1819) Stiles & Hassall 1898, a species widely distributed in opossums across Mexico. A molecular phylogenetic analysis using a mitochondrial gene (cox1), and the nuclear ribosomal internal transcribed spacer region (ITS1-5.8S-ITS2), of specimens of R.coronatus collected in several localities of Mexico revealed that those from the Yucatán Peninsula, originally recorded on morphological grounds as R.coronatus actually represented an independent genetic lineage. Maximum Likelihood and Bayesian Inference analyses were performed for each data set independently, and for the concatenated data set (ITS1-5.8S-ITS2 + cox1). All phylogenetic analyses showed that the specimens from Yucatán represented a monophyletic lineage, with high bootstrap support and Bayesian posterior probabilities. In addition, the genetic divergence estimated between R.oochisp. nov. and two species of Rhopalias, R.coronatus, and R.macracanthus Chandler, 1932 that also occur in Mexican marsupials ranged between 7–8% and 16–17%, for cox1, and between 0.1–0.2% and 7% for the ITS region, respectively. The molecular evidence gathered in this study (reciprocal monophyly in both phylogenetic analyses, and estimated genetic divergence) suggested that the specimens found in the intestine of D.marsupialis originally reported as R.coronatus from Yucatán, actually represent a new species. Morphological evidence was found through light and scanning electron microscopy to support the species distinction based on molecular data.

The significance of vertebrate microfossil size and shape distributions for faunal abundance reconstructions: a Late Cretaceous example

Paleobiology ◽  
1996 ◽  
Vol 22 (3) ◽  
pp. 422-435 ◽  
Author(s):  
Richard W. Blob ◽  
Anthony R. Fiorillo
Keyword(s):  
Late Cretaceous ◽  
Upper Cretaceous ◽  
Sedimentary Facies ◽  
Size And Shape ◽  
South Central ◽  
Faunal Abundance ◽  
Central Montana ◽  
Judith River Formation ◽  
Shape Data

Faunal abundance and fossil size and shape data from microvertebrate localities in the Upper Cretaceous Judith River Formation of south-central Montana illustrate that even when located in similar sedimentary facies, concentrations of vertebrate microfossils may exhibit strikingly different taphonomic profiles. Degrees of microfossil size and shape sorting may vary even among sites from the same sedimentary facies. In some instances, such variations may make it impossible to disregard taphonomic causes for differences sites exhibit in paleofaunal abundances. To limit the possibility that taphonomically generated faunal differences might be mistaken for true differences in paleoecology, comparisons of paleofaunal abundances should be restricted to microvertebrate sites both from similar sedimentary facies and with similar profiles of fossil sizes and shapes.

Eudaemonema webbi sp. nov. (Mammalia, Mixodectidae) from the late Paleocene of western Canada: the youngest known mixodectid

2010 ◽  
Vol 47 (12) ◽  
pp. 1451-1462 ◽  
Author(s):  
Craig S. Scott
Keyword(s):  
New Species ◽  
North American ◽  
Western Canada ◽  
South Central ◽  
Late Paleocene ◽  
Early Paleocene ◽  
Stratigraphic Ranges ◽  
A New Species ◽  
Stratigraphic Range

Mixodectidae (Mammalia, Archonta) are an unusual, poorly known family of dermopteran-like mammals that have been discovered at several North American localities of primarily early Paleocene age. Among the three or four recognized mixodectid genera, Eudaemonema Simpson is perhaps one of the least understood, being known from only a few localities of late Torrejonian and earliest Tiffanian age. This paper reports on a new species of Eudaemonema from the late Paleocene of Alberta, Canada, that significantly extends the geographic and stratigraphic ranges of the genus. Eudaemonema webbi sp. nov. is known from middle and late Tiffanian localities in central and south central Alberta, and it represents the youngest and northernmost species of Eudaemonema so far discovered. E. webbi differs from the genotypic species E. cuspidata in being larger and in having a suite of dental characters (e.g., molariform posterior premolars, enlarged molar protocone and hypocone, development of a second grinding platform on the lower molars) that suggests an increased emphasis on grinding during mastication. E. webbi possesses several dental features (e.g., broad, shelf-like molar paraconid–paracristid, lingually shifted molar hypoconulid) that resemble those of cynocephalids (Mammalia, Dermoptera), with these resemblances interpreted herein as convergent. The occurrence of E. webbi at Gao Mine extends the stratigraphic range of Eudaemonema into the late Tiffanian (Ti5) and represents the youngest known record of Mixodectidae.

Marine tube-dwelling diatoms of eastern Canada: descriptions, checklist, and illustrated key

1984 ◽  
Vol 62 (4) ◽  
pp. 778-794 ◽  
Author(s):  
Christopher S. Lobban
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Common Species ◽  
Bay Of Fundy ◽  
Eastern Canada ◽  
Lawrence Estuary ◽  
The Common ◽  
Living Material ◽  
St Lawrence Estuary ◽  
A New Species

From a study of living materials and specimens in several regional herbaria, a list has been drawn up of all the common and several of the rarer tube-dwelling diatoms of eastern Canada. Descriptions, illustrations of living material and acid-cleaned valves, and a key to the species are provided. Most specimens were from the Atlantic Provinces and the St. Lawrence estuary, but a few were from the Northwest Territories. By far the most common species is Berkeleya rutilans. Other species occurring commonly in the Quoddy Region of the Bay of Fundy, and sporadically in space and time elsewhere, arc Navicula delognei (two forms), Nav. pseudocomoides, Nav. smithii, Haslea crucigera, and a new species, Nav.rusticensis. Navicula ramosissima and Nav. mollis in eastern Canada are usually found as scattered cohabitants in tubes of other species. Nitzschia tubicola and Nz. fontifuga also occur sporadically as cohabitants.

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