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04294aam a2200421 i 4500 001 37F85672B0D511E8923D894D97128E48 003 SILO 005 20180905010705 008 171018t20182018ilua b 001 0 eng c 010 $a 2017050270 020 $a 022640305X 020 $a 9780226403052 020 $a 022640286X 020 $a 9780226402864 035 $a (OCoLC)1004257427 040 $a ICU/DLC $b eng $e rda $c DLC $d OCLCO $d OCLCQ $d TOH $d OCLCF $d YDX $d WLU $d TS4 $d YDX $d UAT $d CLE $d NYP $d OCL $d SILO 042 $a pcc 050 00 $a QL607.5 $b .G44 2018 082 00 $a 596.138 $2 23 100 1 $a Gee, Henry, $d 1962- $e author. 245 10 $a Across the bridge : $b understanding the origin of the vertebrates / $c Henry Gee. 264 1 $a Chicago : $b The University of Chicago Press, $c 2018. 300 $a xii, 312 pages ; $c 24 cm 504 $a Includes bibliographical references and index. 505 0 $a What is a vertebrate?. Vertebrates in context ; What makes a vertebrate? ; Breaking branches ; Summary -- Shaking the tree. Embranchements and transformation ; Evolution and ancestors ; Summary -- Embryology and phylogeny. From embryos to desperation ; Genes and phylogeny ; Summary -- Hox and homology. A brief history of homeosis ; The Geoffroy inversion ; The phylotypic stage ; The meaning of homology ; Summary -- What is a deuterostome? -- Echinoderms -- Hemichordates -- Amphioxus -- Tunicates -- Vertebrates -- Some non-deuterostomes -- Vertebrates from the outside, in. Introduction ; The organizer ; The notochord ; Somitogenesis ; Segmentation and the head problem ; The nervous system ; Neural crest and cranial placodes ; The skeleton ; Summary -- How many sides has a chicken?. Introduction ; The enteric nervous system ; The head and the heart ; The urogenital system ; The gut and its appendages ; Immunity ; The pituitary gland ; Summary -- Some fossil forms. Fossils in an evolutionary context ; Meiofaunal beginnings ; Cambroernids ; Vetulicystids ; Vetulicolians -- Yunnanozoans ; Pikaia ; Cathaymyrus ; The earliest fossil vertebrates ; Conodonts ; Ostracoderms and placoderms ; Summary -- Breaking branches, building bridges. Defining the deuterostomes ; Ambulacraria ; Echinoderms ; Hemichordates ; Chordates ; Amphioxus ;The common ancestry of tunicates and vertebrates ; Tunicates ; Vertebrates ; Cyclostomes ; Gnathostomes ; The evolution of the face ; Crossing the bridge ; Conclusions. 520 $a Our understanding of vertebrate origins and the backbone of human history evolves with each new fossil find and DNA map. Many species have now had their genomes sequenced, and molecular techniques allow genetic inspection of even non-model organisms. But as longtime Nature editor Henry Gee argues in Across the Bridge, despite these giant strides and our deepening understanding of how vertebrates fit into the tree of life, the morphological chasm between vertebrates and invertebrates remains vast and enigmatic. As Gee shows, even as scientific advances have falsified a variety of theories linking these groups, the extant relatives of vertebrates are too few for effective genetic analysis. Moreover, the more we learn about the species that do remainfrom sea-squirts to starfishthe clearer it becomes that they are too far evolved along their own courses to be of much use in reconstructing what the latest invertebrate ancestors of vertebrates looked like. Fossils present yet further problems of interpretation. Tracing both the fast-changing science that has helped illuminate the intricacies of vertebrate evolution as well as the limits of that science, Across the Bridge helps us to see how far the field has come in crossing the invertebrate-to-vertebrate divide -- and how far we still have to go. 650 0 $a Vertebrates $x Origin. 650 0 $a Vertebrates $x Evolution. 650 0 $a Vertebrates $x Physiology. 650 7 $a SCIENCE $x General. $x Zoology $x General. $2 bisacsh 650 7 $a Vertebrates $x Physiology. $2 fast $0 (OCoLC)fst01165575 650 7 $a Vertebrates $x Evolution. $2 fast $0 (OCoLC)fst01165564 941 $a 3 952 $l OVUX522 $d 20231021015446.0 952 $l CEAX572 $d 20200508022729.0 952 $l USUX851 $d 20180905050419.0 956 $a http://locator.silo.lib.ia.us/search.cgi?index_0=id&term_0=37F85672B0D511E8923D894D97128E48 994 $a 92 $b IWAInitiate Another SILO Locator Search