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3 edition of Evolution in a highly paedomorphic lineage found in the catalog.

Evolution in a highly paedomorphic lineage

H. Bradley Shaffer

Evolution in a highly paedomorphic lineage

a case study of the Mexican ambystomatid salamanders

by H. Bradley Shaffer

  • 237 Want to read
  • 26 Currently reading

Published in 1982 .
Written in English


Edition Notes

Statementby H. Bradley Shaffer.
Classifications
LC ClassificationsMicrofilm 83/346 (Q)
The Physical Object
FormatMicroform
Paginationx, 171 leaves
Number of Pages171
ID Numbers
Open LibraryOL3245001M
LC Control Number83160871

  The narratives of human evolution are oft-told and highly contentious. There are major disagreements in the field about whether human evolution is more like a branching tree or a crooked stick, depending partly on how many species one recognizes. Interpretations of almost every new find will be sure to find opposition among other experts. ability, and paedomorphic skulls with redu ced snouts but enlarged eyes and brains. T heevolution ofbirdsfrombipedalcarniv-orous dinosaurs is one of the most com-pelling examples of macroevolution (1–7). Numerous studies (1–18)havedocumented the cumulative evolution of avian charac-teristicsalongthe~millionyear(My)lineage.

In this, the first major book on the subject in fifty years, Stephen Jay Gould documents the history of the idea of recapitulation from its first appearance among the pre-Socratics to its fall in the early twentieth century. Mr. Gould explores recapitulation as an idea that .   In , the publication of On Growth and Form by D'Arcy Wentworth Thompson challenged both mathematicians and naturalists to think about biological shapes and diversity as more than a confusion of chaotic forms generated at random, but rather as geometric shapes that could be described by principles of physics and mathematics. Thompson's work was based on the ideas of Cited by:

General Biology/Print version. From Wikibooks, open books for an open world Often highly regulated; Evolution of biochemical pathways of four different nucleotides, like a recipe book written in a language of only four letters. A mutation event is when the order of the nucleotides in DNA change, usually when the DNA is being copied.   Posts about developmental evolution written by Naraoia. Bird fingers confuse me, but the explanations confuse me more, it seems.. I didn’t mean to post today, but I’ve just read a new review/hypothesis paper about the identities of the stunted little things that .


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Evolution in a highly paedomorphic lineage by H. Bradley Shaffer Download PDF EPUB FB2

We also find evidence for re‐evolution of metamorphosis after several million years of paedomorphosis in a lineage of Eurycea from the Edwards Plateau region of Texas. We also show for the first time using phylogenetic comparative methods that paedomorphosis is highly correlated with cave‐dwelling, arid surface environments, and small Cited by:   The story of the discovery and study of the Monoplacophora (or Tryblidia) and how they have contributed to our understanding of the evolution of the Mollusca highlights the importance of integrating data from the fossil record with the study of living forms.

Monoplacophora were common in the early Paleozoic and were thought to have become extinct during the Devonian Period, approximately Cited by: First, the emergence of both strict and facultative paedomorphic forms from an ancestral transforming lineage is typically associated with two general ecological factors, such as the existence of.

Evolution of paedomorphosis in plethodontid salamanders: Ecological correlates and re-evolution of metamorphosis Article in Evolution 68(2) September with Reads How we measure 'reads'. Paedomorphosis is an important evolutionary force. It has previously been suggested that a soft-substrate sediment-dwelling (infaunal) environment facilitates paedomorphic evolution in marine invertebrates.

However, until recently this proposal Evolution in a highly paedomorphic lineage book never rigorously tested with robust phylogeny and broad taxon selection. Here, for the first time, we present a molecular phylogeny for a majority. Paraves are a widespread group of theropod dinosaurs that originated in the Late Jurassic period.

In addition to the extinct dromaeosaurids, troodontids, anchiornithids, and scansoriopterygids, the group also contains the avialans, among which are the over ten thousand species of living birds. Primitive members of Paraves are well known for the possession of an enlarged claw on the second Clade: Dinosauria.

In biology, saltation (from Latin, saltus, "leap") is a sudden and large mutational change from one generation to the next, potentially causing single-step was historically offered as an alternative to forms of mutationism were effectively saltationist, implying large discontinuous jumps.

Speciation, such as by polyploidy in plants, can sometimes be achieved in. The evolution of the wolf occurred over a geologic time scale of at least thousand years. The grey wolf Canis lupus is a highly adaptable species that is able to exist in a range of environments and which possesses a wide distribution across the s of modern grey wolves have identified distinct sub-populations that live in close proximity to each other.

If you can obtain a model or image of a 1-month-old human embryo, you can demonstrate our four main chordate characteristics. A figure of a human embryo, comparing human and dog embryos of similar stages, was prepared by Charles Darwin and included in the first chapter of his book.

Human evolution from its first separation from the last common ancestor of humans and chimpanzees is characterized by a number of morphological, developmental, physiological, and behavioral changes. The most significant of these adaptations are bipedalism, increased brain size, lengthened ontogeny (gestation and infancy), and decreased sexual dimorphism.

Introduction. Although studies of hominin evolution have seen a recent resurgence of interest in spoken language and human musical capability (Fitch,Hauser and McDermott,Honing et al.,Kirschner and Tomasello,Masataka,Mithen,Trehub,Wallin et al., ), theorising about the evolution of these two distinctively human traits has a long history Cited by: 2.

Nielsen reconstructed these steps as the evolution of larval ciliated cells with striated rootlets (step 1), the evolution of a basal membrane with collagen IV and an outer larval cell layer with adherens-like cell junctions (step 2), and the loss of the sessile adult stage, which establishes Eumetazoa as a paedomorphic lineage (stage 3).

(b Cited by: 8. Indeed, Jones and Gould () describe this evolutionary lineage as the “primary exemplar” in the study of invertebrate evolution. Panel tells the story for one lineage of Gryphaea, as elucidated by Jones and Gould, and drawing on Hallam and Gould (), in. O’Neil, E. M., R. Schwartz, C.

Bullock, J. Williams, H. Shaffer, X. Aguilar-Miguel, G. Parra-Olea, and D. Weisrock. Parallel tagged amplicon. er).-Over half of this book deals with fishes amphibians and reptiles, not a surprising bias considering the taxonomical specialties of the two editors.

Some chapters address single gen-era whereas others take on much higher taxa. Similarly some deal with a highly restricted geo-graphic region whereas others cover virtually all of South America.

It would have been a member of the synapsid lineage and was probably an early mammal. It would have been a member of the diapsid lineage and could have been an ancestor of a modern mammal. It would have been a member of the diapsid lineage and could have been an ancestor of a.

Dobzhansky defined evolution as change of allele frequencies, but some organism-focused evolutionary biologists, such as Rensch, Simpson and Mayr, had a more comprehensive conception of evolution, including phenotypic evolution, speciation and differential proliferation of clades, while recognizing that phenotypic evolution and speciation occur Cited by: This is the first book to explore in depth what happened in human evolution by integrating principles of development and functional morphology with the hominin fossil record.

The Evolution of the Human Head will permanently change the study of human evolution and has widespread ramifications for thinking about other branches of evolutionary.

This best-selling book presented, in a highly accessible format, then-radical ideas on cosmic and biological evolution. Not until forty years later, with the publication of the 12 th edition inwas the author revealed, posthumously, to be Scottish journalist Robert by: 2.

GEOL /BSCI Principles of Paleontology. Fall Semester Variation and Fossil Individuals. Remember, ontogeny pertains to the individual, evolution to the lineage. By the BSC, Panthera is a species with highly variable morphotypes. These similarities were first noted by eminent evolutionary biologist Ernst Mayr (the above is his illustration) in his book What Evolution Is.

In the text, he notes: "embryonic similarities, recapitulation, and vestigial structures raise insurmountable difficulties for a creationist explanation, but are fully compatible with an.

Controversies from the world of ratite and tinamou evolution (part I) plus they concern the origin of the lineage that led to both modern and their pelvic girdles are both highly variable. Fish classifications, as those of most other taxonomic groups, are being transformed drastically as new molecular phylogenies provide support for natural groups that were unanticipated by previous studies.

A brief review of the main criteria used by ichthyologists to define their classifications during the last 50 years, however, reveals slow progress towards using an explicit Cited by: