Your inner fish: a journey into the 3.5-billion-year history of the human body. Asymmetrical craniofacial remodeling and lateralized behavior in larval flatfish. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2007 193(10):1065–79. Free flight maneuvers of stalk-eyed flies: do eye-stalks affect aerial turning behavior. Sex chromosome meiotic drive in stalk-eyed flies. Presgraves DC, Severance E, Wilkinson GS. Field observation on death feigning: a unique hunting behavior by the predatory cichlid, Haplochromis livingstoni, of Lake Malawi. Evolution of the vertebrate eye: opsins, photoreceptors, retina and eye cup. Genetic linkage between a sexually selected trait and X chromosome meiotic drive. X chromosome influences sperm length in the stalk-eyed fly Cyrtodiopsis dalmanni. The evolutionary origin of flatfish asymmetry. The blind watchmaker: why the evidence of evolution reveals a universe without design. On the origin of species by means of natural selection or, The preservation of favored races in the struggle for life. The development of a long, coiled, optic nerve in the stalk-eyed fly Cyrtodiopsis whitei. Ten million years after whales first shifted to the water, when they reached 50 ft long and never returned to land in their lives, whales still had tiny rear legs complete with toes (Zimmer 1998).īuschbeck EK, Hoy RR. Instead, a lineage of mammals gradually became more and more adapted to life in the water. Whales evolved between 50 and 40 million years ago, but they did not leap back in the water, shedding their legs and sprouting flukes in a sudden evolutionary jolt. And after tetrapods began to walk on land, new adaptations continued to emerge for many millions of years, such as the amniote egg that allowed one lineage of tetrapods to lay their eggs on dry land. A lineage of fish gradually evolved parts of the tetrapod body plan, initially while they were still aquatic vertebrates (Shubin 2008). Fish did not suddenly leap onto land, equipped with legs and toes and other adaptations to life out of the water. The lesson of the flatfish is the same kind of lesson emerging from research on other evolutionary transitions.
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