Amniote Origins: Completing the Transition to Land by Stuart Sumida, Karen L.M Martin

By Stuart Sumida, Karen L.M Martin

Amniote Origins integrates glossy systematic equipment with reviews of sensible and physiological methods, and illustrates how reviews of paleobiology will be illuminated through experiences of neonatology. for that reason, comparative anatomists and physiologists, sensible morphologists, zoologists, and paleontologists will all locate this precise quantity very priceless. encouraged by way of the possibility of integrating fields that experience lengthy been remoted from each other, Amniote Origins presents a radical and interdisciplinary synthesis of 1 of the vintage transitions of evolutionary background. Key gains * Integrates glossy systematic tools with stories of practical and physiological methods * Illustrates how stories of paleobiology could be illuminated through reviews of neonatology * presents a radical and interdisciplinary synthesis of 1 of the vintage transitions of evolutionary historical past

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30 M. Laurin andR. Reisz Carroll’s is the most explicit functional scenario on the origin of amniotes and needs to be summarized before it is discussed. Carroll suggested that amniotes evolved from anamniote tetrapods that had direct development and laid their eggs on land, like plethodontid salamanders. According to Carroll, the size of an anamniotic egg is limited by the absence of extraembryonic membranes and by the absence of a mineralized shell because support and gas exchange would be problematic beyond a certain size (10 mm in diameter).

119 Number of sacral vertebrae: none (0); one (1); two or more (2). 120 Ribs: short, straight (0); long, curved (1). 121 Discrete dorsal fm: present (0); absent (1). 122 Radials for caudal fm: present (0); absent (1). 123 Uncinate processes: absent (0); present (1). 124 Interclavicle: without a parasternal process (0); with a parasternal process (1); absent (2). 125 Clavicle: present (0); absent (1). 126 Clavicle shape: with a distinctly expanded ventral plate (0); without a ventral plate, or with narrow ventral plate (1).

Wake for reading the manuscript, for stimulating conversations on lissamphibian anatomy, and for letting one of us (M. ) study the extensive collection of lissamphibian dried skeletons and cleared and stained specimens in the Museum of Vertebrate Zoology and in the Marvalee Wake Collection. Personal communications were obtained from David S Berman on Ecolsonia and from Mr. Michael deBraga on Procolophonidae . We thank Dr. J. Gauthier for New Perspective on Tetrapod Phytogeny 37 stimulating conversations on systematics.

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