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Synapsids

EVOLUTIONARY PATTERNS IN THE HISTORY OF PERMO-TRIASSIC AND ...

Permo-Carboniferous (approximately 300-270 Ma): Pelycosaur-grade synapsids.— In pelycosaur-grade synapsids of the Permo-Carboniferous, the only large terrestrial predators were Dimetrodon , Ophiacodon (Romer and Price, 1941; Reisz, 1986), and possibly Secodontosaurus (IJ, pers. obs.).

Synapsids and evolution of mammals

•Synapsidaincludes all amniotes with synapsid skull. skull. •Synapsid clade includes:-Nonmammalian synapsids, or "Mammal-like reptiles" y (extinct) •This is not a very scientific term, it actually refers to a paraphyletic group.

Sauropsida and Synapsida: Two major clades of amniotes

Synapsids developed muscular diaphragm •Muscular diaphragm separates body cavity into 2 parts:-Pulmonary cavity-Abdominal cavity •Convex anteriorly when relaxed, flattens when contracted.

Biology 356 - Major Features of Vertebrate Evolution Dr ...

Biology 356 - Major Features of Vertebrate Evolution Dr. Robert Reisz, University of Toronto Permo-Carb. Synapsids Paleozoic synapsids (also called mammal-like reptiles, pelycosaurs and early therapsids) occupy a central position in amniote evolution.

Turtles and Crocodilians

Outline • Synapsids vs Sauropsids • Turtles -- Extant Groups, Shells, Temperature Regulation, Social Behavior, Reproduction, Navigation • Crocodilians -- Extant Groups, Feeding, Temperature Regulation, Reproduction

VARIATIONS IN SALAMANDER TRACKW AYS RESULTING FROM SUBSTRATE ...

1006 JOURNAL OF PALEONTOLOGY, V. 70, NO.6, 1996 i~s I ~ ~~ PACE ANGULATION TOE DIVERGENCE STRIDE f)~ f«-~~-----~../ ~ Substrates California >-Grain size categories Utah sand sand Mud ~~ Coarse sand (500-1,000 11m) 0.07% 0.003% 5% oQ Medium sand (250-500 11m) 18 44 3 ~~ Fine sand (125-250 11m ...

The MammaryGland and Its Origin During Synapsid Evolution

Integument and Cutaneous Glands of Synapsids, Including Mammals Many biologists have assumed that"mammal-like reptiles" (basal synapsids andnonmammalian therapsids) were endowed with keratinized scales; in fact Spearman (85) argued that since hair and hair follicles are not homologous to scales, they ...

CLADOGRAM

The Molecular Connection 1. Find the human, rhesus monkey, kangaroo, snapping turtle, bullfrog, and tuna on the "Amino Acid Sequences in Cytochrome-C Proteins from 20 Different Species" chart provided and underline their names.

EVOLUTIONARY PATTERNS AMONG PERMO -TRIASSIC THERAPSIDS

Synapsids that are not therapsids (i.e., nontherapsid synapsids) area paraphyletic group traditionally termed"pelycosaurs" (P). Because fossil synapsids show a blend of mammalian and reptilian characteristics, the latter actually being retentions of the primitive amniote condition, the term"mammal-like ...

Mammals

The synapsid lineage was the first group to radiate widely in terrestrial habitats. During the Late Carboniferous and the entire Permian periods, synapsids were the most abundant terrestrial vertebrates; and from the Early Permian into the Triassic, they were the top carnivores.