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** In many fish, the pectoral fins aid in walking, especially in the lobe-like fins of some anglerfish and in the mudskipper.
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** and fish
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In Devonian | Late Devonian vertebrate speciation, descendants of Pelagic zone | pelagic Sarcopterygii | lobe-finned fish – like Eusthenopteron – exhibited a sequence of adaptations: * Panderichthys, suited to muddy shallows ; * Tiktaalik with limb-like fins that could take it up onto land ; * Tetrapod | Early tetrapods in weed-filled swamps, such as: ** Acanthostega which had feet with eight digits, ** Ichthyostega with limbs.
In Devonian | Late Devonian vertebrate speciation, descendants of Pelagic zone | pelagic lobe-finned fish — like Eusthenopteron — exhibited a sequence of adaptations: * Panderichthys, suited to muddy shallows ; * Tiktaalik with limb-like fins that could take it onto land ; * Early tetrapod s in weed-filled swamps, such as: ** Acanthostega, which had feet with eight digits, ** Ichthyostega with limbs.
** Order Perciformes 40 % of all fish including anabantids, bass, cichlids, gobies, gouramis, mackerel, perches, scats, whiting, wrasses
** Most fish have a homocercal tail, where the fin appears superficially symmetric but in fact the vertebrae extend for a very short distance into the upper lobe of the fin.
** A peculiar function of pectoral fins, highly developed in some fish, is the creation of the dynamic lifting force that assists some fish, such as sharks, in maintaining depth and also enables the " flight " for flying fish. Bigeye tuna Thunnus obesus showing finlets and keels. Drawing by Dr Tony Ayling
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