Phylogenetic Relationships and Divergence Timing ofCrocodylusBased on Morphology and the Fossil Record

Copeia ◽  
2000 ◽  
Vol 2000 (3) ◽  
pp. 657-673 ◽  
Author(s):  
Christopher A. Brochu
Keyword(s):  
Phylogenetic Relationships ◽  
Fossil Record ◽  
Divergence Timing

Progress and future directions in archosaur phylogenetics

2001 ◽  
Vol 75 (6) ◽  
pp. 1185-1201 ◽  
Author(s):  
Christopher A. Brochu
Keyword(s):  
Phylogenetic Relationships ◽  
Fossil Record ◽  
Middle Triassic ◽  
Basic Structure ◽  
Sources Of Information ◽  
Crown Group ◽  
Future Directions ◽  
Close Relationship ◽  
Divergence Timing

The basic structure of archosaurian phylogeny is understood to include two primary crown-group lineages—one leading to living crocodiles and including a broad diversity of Triassic animals (e.g., phytosaurs, rauisuchians, aetosaurs), and another leading to dinosaurs (living and extinct). These lineages were established by the middle Triassic. A few extinct groups remain controversial, such as the pterosaurs, and debate persists over the phylogenetic relationships among extant bird lineages, which have proved difficult to resolve, and divergence timing estimates within Aves and Crocodylia remain the source of contention. A few analyses support a close relationship between archosaurs and turtles, or even a nesting of turtles within Archosauria. All sources of information used to resolve these issues have weaknesses, and these problems all involve highly derived lineages when they first appear in the fossil record.

scholarly journals A review of the systematic biology of fossil and living bony-tongue fishes, Osteoglossomorpha (Actinopterygii: Teleostei)

2018 ◽  
Vol 16 (3) ◽  
Author(s):  
Eric J. Hilton ◽  
Sébastien Lavoué
Keyword(s):  
Phylogenetic Relationships ◽  
Fossil Record ◽  
The State ◽  
Heterogeneous Group ◽  
Marine Deposits ◽  
Evolutionary Study ◽  
Future Needs ◽  
Phylogenetic Affinities ◽  
Basal Position ◽  
Systematic Biology

ABSTRACT The bony-tongue fishes, Osteoglossomorpha, have been the focus of a great deal of morphological, systematic, and evolutionary study, due in part to their basal position among extant teleostean fishes. This group includes the mooneyes (Hiodontidae), knifefishes (Notopteridae), the abu (Gymnarchidae), elephantfishes (Mormyridae), arawanas and pirarucu (Osteoglossidae), and the African butterfly fish (Pantodontidae). This morphologically heterogeneous group also has a long and diverse fossil record, including taxa from all continents and both freshwater and marine deposits. The phylogenetic relationships among most extant osteoglossomorph families are widely agreed upon. However, there is still much to discover about the systematic biology of these fishes, particularly with regard to the phylogenetic affinities of several fossil taxa, within Mormyridae, and the position of Pantodon. In this paper we review the state of knowledge for osteoglossomorph fishes. We first provide an overview of the diversity of Osteoglossomorpha, and then discuss studies of the phylogeny of Osteoglossomorpha from both morphological and molecular perspectives, as well as biogeographic analyses of the group. Finally, we offer our perspectives on future needs for research on the systematic biology of Osteoglossomorpha.

scholarly journals Temporal ranges and ancestry in the hominin fossil record: The case of Australopithecus sediba

2018 ◽  
Vol 114 (3/4) ◽  
Author(s):  
Chris Robinson ◽  
Timothy L. Campbell ◽  
Susanne Cote ◽  
Darryl J. de Ruiter
Keyword(s):  
Phylogenetic Relationships ◽  
Fossil Record ◽  
Thought Experiment ◽  
Mammalian Species ◽  
Data Sources ◽  
Evolutionary Relationships ◽  
Temporal Data ◽  
Genus Homo ◽  
Using Data ◽  
Fossil Hominin

In attempting to resolve the phylogenetic relationships of fossil taxa, researchers can use evidence from two sources – morphology and known temporal ranges. For most taxa, the available evidence is stronger for one of these data sources. We examined the limitations of temporal data for reconstructing hominin evolutionary relationships, specifically focusing on the hypothesised ancestor–descendant relationship between Australopithecus sediba and the genus Homo. Some have implied that because the only known specimens of A. sediba are dated to later than the earliest fossils attributed to Homo, the former species is precluded from being ancestral to the latter. However, A. sediba is currently known from one site dated to 1.98 Ma and, thus, its actual temporal range is unknown. Using data from the currently known temporal ranges of fossil hominin species, and incorporating dating error in the analysis, we estimate that the average hominin species’ temporal range is ~0.97 Myr, which is lower than most figures suggested for mammalian species generally. Using this conservative figure in a thought experiment in which the Malapa specimens are hypothesised to represent the last appearance date, the middle of the temporal range, and first appearance date for the species, the first appearance date of A. sediba would be 2.95, 2.47 and 1.98 Ma, respectively. As these scenarios are all equally plausible, and 2.95 Ma predates the earliest specimens that some have attributed to Homo, we cannot refute the hypothesis that the species A. sediba is ancestral to our genus based solely on currently available temporal data.

Hidden diversity of small predators: new thorny lacewings from mid-Cretaceous amber from northern Myanmar (Neuroptera: Rhachiberothidae: Paraberothinae)

2020 ◽  
Vol 157 (7) ◽  
pp. 1149-1175 ◽  
Author(s):  
Hiroshi Nakamine ◽  
Shûhei Yamamoto ◽  
Yui Takahashi
Keyword(s):  
New Species ◽  
Northern Hemisphere ◽  
Morphological Variation ◽  
Phylogenetic Relationships ◽  
Fossil Record ◽  
Morphological Structure ◽  
Burmese Amber ◽  
Size Number ◽  
Fossil Records

AbstractThorny lacewings (Rhachiberothidae) are currently distributed only within Africa, whereas they are prevalent in the fossil record of various Cretaceous ambers across the Northern Hemisphere, with a handful of the fossil records from some Eocene European ambers. Four rhachiberothid species in four extinct genera are known from the mid-Cretaceous amber of northern Myanmar. Here, we report further examples of the remarkable palaeodiversity of this group from the same amber deposit, adding the four new fossil genera and seven new species: Acanthoberotha cuspis gen. et sp. nov., Astioberotha falcipes gen. et sp. nov., Stygioberotha siculifera gen. et sp. nov., Uranoberotha chariessa gen. et sp. nov., Creagroparaberotha cuneata sp. nov., Micromantispa galeata sp. nov. and M. spicata sp. nov. Based on a series of well-preserved specimens, we discuss the fine details of the raptorial forelegs and genital segments, which may be important for elucidating the phylogenetic relationships among genera. Our findings reveal an unexpectedly diverse assemblage of thorny lacewings in the Cretaceous System, highlighting the morphologically diverse rhachiberothids in Burmese amber. The discovery of seven additional rhachiberothid species in Myanmar amber suggests the potential for much higher diversity and abundance of the Cretaceous rhachiberothids than previously documented. Furthermore, morphological variation in the raptorial forelegs was found to be extremely diverse among the Burmese amber paraberothines, especially in terms of the size, number and shape of spines (or spine-like setae) on the inner edges of protibia, and the morphological structure of the probasitarsus.

Anatomy, systematics, paleoenvironment, growth, and age of the sauropod dinosaur Sonorasaurus thompsoni from the Cretaceous of Arizona, USA

2016 ◽  
Vol 90 (1) ◽  
pp. 102-132 ◽  
Author(s):  
Michael D. D’Emic ◽  
Brady Z. Foreman ◽  
Nathan A. Jud
Keyword(s):  
Life History ◽  
Late Cretaceous ◽  
North American ◽  
Phylogenetic Relationships ◽  
Fossil Record ◽  
Cladistic Analysis ◽  
Detrital Zircons ◽  
Bone Histology ◽  
Seasonal Precipitation ◽  
Adult Size

AbstractSauropod dinosaurs are rare in the Cretaceous North American fossil record in general and are absent from that record for most of the Late Cretaceous. Sonorasaurus thompsoni from the Turney Ranch Formation of the Bisbee Group of Arizona, USA, potentially represents one of the youngest sauropods before their ca. 30-million-year-long hiatus from the record. The anatomy of Sonorasaurus has only been briefly described, its taxonomic validity has been questioned, several hypotheses have been proposed regarding its phylogenetic relationships, and its life history, geologic age, and reported paleoenvironment are ambiguous.Herein we assess the systematics, paleoenvironment, life history, and geologic age of Sonorasaurus based on firsthand observation, bone histology, and fieldwork in the holotypic quarry and environs. The validity of S. thompsoni is substantiated by autapomorphies. Cladistic analysis firmly places it within the Brachiosauridae, in contrast to results of some recent analyses. Bone histology suggests that the only known exemplar of Sonorasaurus grew slowly and sporadically compared to other sauropods and was approaching its adult size. In contrast with previous assessments of a coastal/estuarine paleoenvironment for the Turney Ranch Formation, our sedimentological and plant macrofossil data indicate that Sonorasaurus lived in a semiarid, low relief evergreen woodland that received highly variable (perhaps seasonal) precipitation. We obtained detrital zircons from the holotypic quarry for U-Pb dating, which only yielded Barremian-aged and older grains, whereas other radiometric and biostratigraphic data suggest that the sediments at the quarry were deposited near the Albian-Cenomanian boundary.Sonorasaurus is taxonomically valid, represents one of the geologically youngest brachiosaurid sauropods, and inhabited a harsh inland evergreen-dominated woodland environment that limited its growth. A review of other Bisbee Group dinosaurs suggests that its fauna, although poorly sampled, exhibits broad similarity to those from coeval North American horizons, reinforcing the apparent faunal homogeneity at the time.

scholarly journals Phylogenetic taxonomy and classification of the Crinoidea (Echinodermata)

2017 ◽  
Vol 91 (4) ◽  
pp. 829-846 ◽  
Author(s):  
David F. Wright ◽  
William I. Ausich ◽  
Selina R. Cole ◽  
Mark E. Peter ◽  
Elizabeth C. Rhenberg
Keyword(s):  
Phylogenetic Relationships ◽  
Fossil Record ◽  
Phylogenetic Analyses ◽  
Major Goal ◽  
Evolutionary Patterns ◽  
Phylogenetic Taxonomy ◽  
Phylogenetic Perspective ◽  
Phylogenetic Hypotheses ◽  
Patterns And Processes

AbstractA major goal of biological classification is to provide a system that conveys phylogenetic relationships while facilitating lucid communication among researchers. Phylogenetic taxonomy is a useful framework for defining clades and delineating their taxonomic content according to well-supported phylogenetic hypotheses. The Crinoidea (Echinodermata) is one of the five major clades of living echinoderms and has a rich fossil record spanning nearly a half billion years. Using principles of phylogenetic taxonomy and recent phylogenetic analyses, we provide the first phylogeny-based definition for the Clade Crinoidea and its constituent subclades. A series of stem- and node-based definitions are provided for all major taxa traditionally recognized within the Crinoidea, including the Camerata, Disparida, Hybocrinida, Cladida, Flexibilia, and Articulata. Following recommendations proposed in recent revisions, we recognize several new clades, including the Eucamerata Cole 2017, Porocrinoidea Wright 2017, and Eucladida Wright 2017. In addition, recent phylogenetic analyses support the resurrection of two names previously abandoned in the crinoid taxonomic literature: the Pentacrinoidea Jaekel, 1918 and Inadunata Wachsmuth and Springer, 1885. Last, a phylogenetic perspective is used to inform a comprehensive revision of the traditional rank-based classification. Although an attempt was made to minimize changes to the rank-based system, numerous changes were necessary in some cases to achieve monophyly. These phylogeny-based classifications provide a useful template for paleontologists, biologists, and non-experts alike to better explore evolutionary patterns and processes with fossil and living crinoids.

The fossil record ofphoberomys pattersoniMones 1980 (Mammalia, Rodentia) from Urumaco (Late Miocene, Venezuela), with an analysis of its phylogenetic relationships

2006 ◽  
Vol 4 (3) ◽  
pp. 293-306 ◽  
Author(s):  
Inés Horovitz ◽  
Marcelo R. Sánchez‐Villagra ◽  
Thomas Martin ◽  
Orangel A. Aguilera
Keyword(s):  
Late Miocene ◽  
Phylogenetic Relationships ◽  
Fossil Record
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