Read e-book online Amniote Origins: Completing the Transition to Land PDF

By Stuart Sumida, Karen L.M Martin

ISBN-10: 0126764603

ISBN-13: 9780126764604

Amniote Origins integrates sleek systematic equipment with reviews of useful and physiological techniques, and illustrates how experiences of paleobiology may be illuminated by way of reports of neonatology. accordingly, comparative anatomists and physiologists, useful morphologists, zoologists, and paleontologists will all locate this special quantity very helpful. encouraged through the chance 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 sleek systematic equipment with stories of useful and physiological strategies * Illustrates how reviews of paleobiology could be illuminated by way of stories of neonatology * presents an intensive and interdisciplinary synthesis of 1 of the vintage transitions of evolutionary heritage

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In this study, nectrideans and various microsaurs seem to share more synapomorphies with lysorophids than with adelogyrinids and aistopods. Of course, these results are difficult to compare because the present study includes three clades of microsaurs instead of Microsauria as a terminal taxon, and Carroll omitted lissamphibians from his study. Otherwise, the agreement between these two studies is remarkable and may result partly from a similar choice of characters. The inclusion of lissamphibians in the matrix was essential to this analysis.

For instance, most amniotes found at Joggins and Florence, Nova Scotia (two of the localities in which the earliest amniotes were found) were preserved in hollow tree stumps. As the largest stumps had a diameter of only about 30-60 cm, the vertebrates preserved in them were necessarily relatively small. Even here, some of the amniote remains found at Joggins and Florence (Reisz, 1972) were only moderately small (centrum length 5-9 mm), with an estimated snout-vent length of up to 350 mm. In fact, the smallest presumed amniote from Joggins, Archerpeton with an estimated snoutvent length of 60 mm (Carroll, 1964, 1970b), is a tiny microsaur (R.

22 Postparietal number: two (0); one (1); absent (2). 23 Postparietal position: on skull table or on skull table and on occiput (0); only on occiput (1). 24 Tabular-parieta l contact: absent (0); present (1). 25 Prefrontal: present (0); absent (1). 26 Prefrontal anterior contacts: anterior tectal and lacrimal, minimally (0); nasal and lacrimal only (1); external naris and/or septomaxilla, in addition to other elements (2). 27 Postfrontal: reaches orbit (0); excluded from orbit (1); absent (2). 28 Postorbital: reaches orbit (0); excluded from orbit (1); absent (2).

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

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