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Transitional fossil
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A transitional fossil is any fossilized remains of a life form that exhibits traits common to both an ancestral group and its derived descendant group. This is especially important where the descendan
Archaeopteryx is one of the most famous transitional fossils and gives evidence for the evolution of birds from theropod dinosaurs.
Archaeopteryx is one of the most famous transitional fossils and gives evidence for the evolution of birds from theropod dinosaurs.
Traditional spindle diagram showing the vertebrates classes "budding" off from each other. Transitional fossils typically represent animals from near
Traditional spindle diagram showing the vertebrates classes "budding" off from each other. Transitional fossils typically represent animals from near the branching points.
A. afarensis - walking posture
A. afarensis - walking posture
Reconstruction of Pakicetus
Reconstruction of Pakicetus
Tiktaalik
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Tiktaalik is a monospecific genus of extinct sarcopterygian from the late Devonian Period, about 375 Mya, having many features similar to those of tetrapods. Tiktaalik is estimated to have had a total
Transitional fossil
…that lived in the river. Hence, ambulocetids represent the transition phase of cetacean ancestors between freshwater and marine habitat. Tiktaalik Tiktaalik roseae had spiracles (air holes) above the eyes. Life restoration of Tiktaalik roseae Tiktaalik is a genus of extinct sarcopterygian (lobe-finned fish) from…
Tiktaalik Chicago
Tiktaalik Chicago
Neil Shubin, one of the paleontologists who discovered Tiktaalik, holding a cast of its skull
Neil Shubin, one of the paleontologists who discovered Tiktaalik, holding a cast of its skull
Skull showing otic notches above the eyes
Skull showing otic notches above the eyes
Pectoral fin of the Australian lungfish (Neoceratodus fosteri), showing an anatomy common to many lobe-finned fish. The metapterygial axis (a line of
Pectoral fin of the Australian lungfish (Neoceratodus fosteri), showing an anatomy common to many lobe-finned fish. The metapterygial axis (a line of rectangular axials) runs down the middle of the fin, flanked by radials which branch away from the midline, and finally very thin fin rays (lepidotrichia)