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http://en.wikipedia.org/wiki/File:Hadrosaur-tree-v4.jpg Phylogenies of Hadrosauridae. A, after Gates et al., 2011, based on the analysis of Horner et al., 2004. B, after Prieto-Márquez, 2010. http://qilong.wordpress.com/2011/08/09/o-crest-less-one/ Horner, J. R., Weishampel, D. B. & Forster, c. A. 2004. Hadrosauridae. pp.438–463 in Weishampel, Dodson & Osmólska (eds.) The Dinosauria (second edition). University of California Press (Berkeley, California, USA). Prieto-Márquez, A. 2010. Global phylogeny of Hadrosauridae (Dinosauria: Ornithopoda) using parsimony and Bayesian methods. Zoological Journal of the Linnean Society. 159:435–502.
Reconstructing the origin and evolution of land plants and their algal relatives is a fundamental problem in plant phylogenetics, and is essential ...
Bird Phylogeny Poster A completely updated phylogenetic tree, incorporating the most recent molecular studies that have revolutionized our understanding of the relationships between and among the orders and families of the world’s birds.
Caenolestes sangaySangay Shrew-Opossum Abstract The 4 known species of northern shrew-opossums, Caenolestes (Paucituberculata: Caenolestidae), are restricted to the northern Andes of South America. Five specimens of a new species of Caenolestes were collected in Sangay National Park on the eastern slopes of the Andes in Ecuador. Review of museum specimens revealed 6 additional specimens of this species, here named Caenolestes sangay. All specimens were collected in cloud forest habitats from 2,050 to 3,500 m above sea level along a recently constructed highway. The new species appears to be uncommon. Inadequate sampling on the eastern slopes of the Andes limits our understanding of the distributional limits of the new species, but it occurs in a region of high endemism. New roads and land conversion threaten mature habitats near the type locality. The new species is medium sized with a narrow antorbital vacuity. It is distinguished from congeners by its large major palatine foramen and a diastema between I4 and C, among other characters. A phylogeny of Caenolestidae based on molecular and morphological characters shows a sister-group relationship between Lestoros and Rhyncholestes and indicates that the new species is likely closest to C. caniventer. Keywords: Andes, Caenolestes, cloud forest, cytochrome b, Eastern Versant, Ecuador, new species, phylogeny, Sangay National Park Reed Ojala-Barbour, C. Miguel Pinto, Jorge Brito M., Luis Albuja V., Thomas E. Lee, Jr. and Bruce D. Patterson. 2013. A New Species of Shrew-Opossum (Paucituberculata: Caenolestidae) with A Phylogeny of Extant caenolestids. Journal of Mammalogy. 94 (5): 967–982. doi: dx.doi.org/10.1644/13-MAMM-A-018.1. http://www.mammalogy.org/caenolestes-sangay-2076 A New Species of Shrew-Opossum Located in the Eastern Andes Mountains An article featured in the Journal of Mammalogy reports on a new species of the marsupial, Caenolestes sangay, which was discovered in the Sangay National Park. http://www.prweb.com/releases/mamm/94-5/prweb11232650.htm http://news.mongabay.com/2013/1220-barrett-new-marsupial-discovered.html Descubren nueva especie de ratón marsupial en Sangay http://www.lahora.com.ec/index.php/noticias/show/1101579261
Background The extant squamates (>9400 known species of lizards and snakes) are one of the most diverse and conspicuous radiations of terrestrial vertebrates, but no studies have attempted to reconstruct a phylogeny for the group with large-scale taxon sampling. Such an estimate is invaluable for comparative evolutionary studies, and to address their classification. Here, we present the first large-scale phylogenetic estimate for Squamata. Results The estimated phylogeny contains 4161 species, representing all currently recognized families and subfamilies. The analysis is based on up to 12896 base pairs of sequence data per species (average = 2497 bp) from 12 genes, including seven nuclear loci (BDNF, c-mos, NT3, PDC, R35, RAG-1, and RAG-2), and five mitochondrial genes (12S, 16S, cytochrome b, ND2, and ND4). The tree provides important confirmation for recent estimates of higher-level squamate phylogeny based on molecular data (but with more limited taxon sampling), estimates that are very different from previous morphology-based hypotheses. The tree also includes many relationships that differ from previous molecular estimates and many that differ from traditional taxonomy. Conclusions We present a new large-scale phylogeny of squamate reptiles that should be a valuable resource for future comparative studies. We also present a revised classification of squamates at the family and subfamily level to bring the taxonomy more in line with the new phylogenetic hypothesis. This classification includes new, resurrected, and modified subfamilies within gymnophthalmid and scincid lizards, and boid, colubrid, and lamprophiid snakes.
THE GLOBAL FLORA The phylogeny of angiosperms poster: a visual summary of APG IV family relationships and floral diversity James W. Byng, Erik F. Smets, Rogier van Vugt, Ehoarn Bidault, Christopher Davidson, Greg Kenicer, Mark W. Chase & Maarten J.M. … Read More
Camptosaurus is an genus of plant-eating, beaked ornithischian dinosaurs of the Late Jurassic period of western North America. The name means 'flexible lizard', (Greek καμπτος/kamptos meaning 'bent' and σαυρος/sauros meaning 'lizard'). Camptosaurus is a relatively heavily built form, with robust hindlimbs and broad feet, still having four toes.[1] Due to the separate status of Uteodon it has become problematic which material from the Morrison belongs to Camptosaurus. The specimens with certainty
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A short explanation of phylogeny and using cladograms, where students analyze a diagram, identify derived characters, and then construct their own cladogram.
A new, fully dated total-evidence phylogeny of baleen whales (Mysticeti) shows that evolutionary phases correlate strongly with Caenozoic modernization of the oceans and climates, implying a major role for bottom-up physical drivers. The phylogeny of 90 ...
Background Understanding how biodiversity is shaped through time is a fundamental question in biology. Even though tropical rain forests (TRF) represent the most diverse terrestrial biomes on the planet, the timing, location and mechanisms of their diversification remain poorly understood. Molecular phylogenies are valuable tools for exploring these issues, but to date most studies have focused only on recent time scales, which minimises their explanatory potential. In order to provide a long-term view of TRF diversification, we constructed the first complete genus-level dated phylogeny of a largely TRF-restricted plant family with a known history dating back to the Cretaceous. Palms (Arecaceae/Palmae) are one of the most characteristic and ecologically important components of TRF worldwide, and represent a model group for the investigation of TRF evolution. Results We provide evidence that diversification of extant lineages of palms started during the mid-Cretaceous period about 100 million years ago. Ancestral biome and area reconstructions for the whole family strongly support the hypothesis that palms diversified in a TRF-like environment at northern latitudes. Finally, our results suggest that palms conform to a constant diversification model (the 'museum' model or Yule process), at least until the Neogene, with no evidence for any change in diversification rates even through the Cretaceous/Paleogene mass extinction event. Conclusions Because palms are restricted to TRF and assuming biome conservatism over time, our results suggest the presence of a TRF-like biome in the mid-Cretaceous period of Laurasia, consistent with controversial fossil evidence of the earliest TRF. Throughout its history, the TRF biome is thought to have been highly dynamic and to have fluctuated greatly in extent, but it has persisted even during climatically unfavourable periods. This may have allowed old lineages to survive and contribute to the steady accumulation of diversity over time. In contrast to other plant studies, our results suggest that ancient and steady evolutionary processes dating back to the mid-Cretaceous period can contribute, at least in part, to present day species richness in TRF.
Flying squirrels may have originated earlier than previously thought and remained unchanged for almost 12 million years.