Share

A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology

2023-04-13 Science
Download A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology PDF Online Free

Author :
Release : 2023-04-13
Genre : Science
Kind : eBook
Book Rating : 168/5 ( reviews)

GET EBOOK


Book Synopsis A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology by : Colin D. Sumrall

Download or read book A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology written by Colin D. Sumrall. This book was released on 2023-04-13. Available in PDF, EPUB and Kindle. Book excerpt: The extraxial-axial theory (EAT) and universal elemental homology (UEH) are often portrayed as mutually exclusive hypotheses of homology within pentaradiate Echinodermata. EAT describes homology upon the echinoderm bauplan, interpreted through early post-metamorphic growth and growth zones, dividing it into axial regions generally associated with elements of the ambulacral system and extraxial regions that are not. UEH describes the detailed construction of the axial skeleton, dividing it into homologous plates and plate series based on symmetry, early growth, and function. These hypotheses are not in conflict; the latter is rooted in refinement of the former. Some interpretive differences arise because many of the morphologies described from eleutherozoan development are difficult to reconcile with Paleozoic forms. Conversely, many elements described for Paleozoic taxa by UEH, such as the peristomial border plates, are absent in eleutherozoans. This Element recommends these two hypotheses be used together to generate a better understanding of homology across Echinodermata.

The Ecology of Biotic Interactions in Echinoids

2023-10-31 Reference
Download The Ecology of Biotic Interactions in Echinoids PDF Online Free

Author :
Release : 2023-10-31
Genre : Reference
Kind : eBook
Book Rating : 846/5 ( reviews)

GET EBOOK


Book Synopsis The Ecology of Biotic Interactions in Echinoids by : Elizabeth Petsios

Download or read book The Ecology of Biotic Interactions in Echinoids written by Elizabeth Petsios. This book was released on 2023-10-31. Available in PDF, EPUB and Kindle. Book excerpt: This Element reviews the ecologies of skeletal trace-producing interactions on echinoids in Modern ecosystems and the recognition of those biogenic traces in the fossil record. This title is also available as Open Access on Cambridge Core.

Testing Character Evolution Models in Phylogenetic Paleobiology

2021-08-26 Science
Download Testing Character Evolution Models in Phylogenetic Paleobiology PDF Online Free

Author :
Release : 2021-08-26
Genre : Science
Kind : eBook
Book Rating : 72X/5 ( reviews)

GET EBOOK


Book Synopsis Testing Character Evolution Models in Phylogenetic Paleobiology by : April Wright

Download or read book Testing Character Evolution Models in Phylogenetic Paleobiology written by April Wright. This book was released on 2021-08-26. Available in PDF, EPUB and Kindle. Book excerpt: Macroevolutionary inference has historically been treated as a two-step process, involving the inference of a tree, and then inference of a macroevolutionary model using that tree. Newer models blend the two steps. These methods make more complete use of fossils than the previous generation of Bayesian phylogenetic models. They also involve many more parameters than prior models, including parameters about which empiricists may have little intuition. In this Element, we set forth a framework for fitting complex, hierarchical models. The authors ultimately fit and use a joint tree and diversification model to estimate a dated phylogeny of the Cincta (Echinodermata), a morphologically distinct group of Cambrian echinoderms that lack the fivefold radial symmetry characteristic of extant members of the phylum. Although the phylogeny of cinctans remains poorly supported in places, this Element shows how models of character change and diversification contribute to understanding patterns of phylogenetic relatedness and testing macroevolutionary hypotheses.

Echinoderm Larvae

1914 Echinodermata
Download Echinoderm Larvae PDF Online Free

Author :
Release : 1914
Genre : Echinodermata
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Echinoderm Larvae by : Herbert Clifton Chadwick

Download or read book Echinoderm Larvae written by Herbert Clifton Chadwick. This book was released on 1914. Available in PDF, EPUB and Kindle. Book excerpt:

Echinoderm Morphological Disparity: Methods, Patterns, and Possibilities

2021-02-11 Science
Download Echinoderm Morphological Disparity: Methods, Patterns, and Possibilities PDF Online Free

Author :
Release : 2021-02-11
Genre : Science
Kind : eBook
Book Rating : 041/5 ( reviews)

GET EBOOK


Book Synopsis Echinoderm Morphological Disparity: Methods, Patterns, and Possibilities by : Bradley Deline

Download or read book Echinoderm Morphological Disparity: Methods, Patterns, and Possibilities written by Bradley Deline. This book was released on 2021-02-11. Available in PDF, EPUB and Kindle. Book excerpt: The quantification of morphology through time is a vital tool in elucidating macroevolutionary patterns. Studies of disparity require intense effort but can provide insights beyond those gained using other methodologies. Over the last several decades, studies of disparity have proliferated, often using echinoderms as a model organism. Echinoderms have been used to study the methodology of disparity analyses and potential biases as well as documenting the morphological patterns observed in clades through time. Combining morphological studies with phylogenetic analyses or other disparate data sets allows for the testing of detailed and far-reaching evolutionary hypotheses.

You may also like...