basking shark

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Related to Elephant shark: tiger shark, Zebra shark, Elephant fish, basking shark

basking shark,

large, plankton-feeding shark, Cetorhinus maximus, inhabiting many oceans of the world, especially in temperate regions. Found singly or in schools of up to 100, it spends much of its time on or just below the surface, cruising slowly with its dorsal fin breaking water. It reaches a length of 40 ft (12 m) and weighs up to 8,500 lb (3,900 kg)—among fishes it is second in size only to the whale shark. It feeds by filtering out plankton as water passes into its mouth and out of the gills. Its gill openings are greatly enlarged to accommodate a large volume of water, and its throat is lined with numerous slender structures called gill rakers. These rakers, which are attached to the inside of the gill arches, form a fine mesh that serves as a strainer. The basking shark has a torpedo-shaped body, a nearly symmetrical tail fin, and long, conspicuous gill slits. Its color ranges from gray to black or brown. It is fished commercially, mostly by harpooning; its flesh is used for fish meal and its liver oil for certain tanning processes. It is classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Chondrichthyes, order Selachii, family Cetorhinidae.

basking shark

a very large plankton-eating shark, Cetorhinus maximus, often floating at the sea surface: family Cetorhinidae
References in periodicals archive ?
Furthermore, large chunks of elephant shark and human chromosomes were found to be highly similar.
Prof Byrappa Venkatesh, Research Director at IMCB, and lead author of the Nature paper added, "The slow evolving genome of the elephant shark is probably the best proxy for the ancestor of all jawed-vertebrates that became extinct a long time ago.
Dr Wes Warren, senior author of the Nature paper commented, "Although cartilaginous vertebrates and bony vertebrates diverged about 450 million years ago, with the elephant shark genome in hand, we can now begin to identify key genetic adaptations in the evolutionary tree.
For more information about the elephant shark genome, please visit:
Venkatesh said that the finding underscores the research utility of the elephant shark, which IMCB scientists proposed in 2005 as a valuable reference genome to understand the human genome.
Venkatesh's team has described research showing that the human DNA sequence was more similar to elephant shark than to any other fish.