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Biodiversity (continued)
Fig. 2: A regional analysis of 25 oceanic regions shows that 92% of all known biodiversity falls into a dozen groups, of which crustaceans (for example, crabs,
shrimps, and lobsters), mollusks (for example, snails, bivalves, squids, and octopus), and fish constitute almost half. Well-known vertebrates, including marine
mammals (for example, seals, whales, and dolphins), reptiles (turtles and snakes), and birds, account for only 2% of the species total.
(Credit: Russ Hopcroft, Gary Cranitch, Julian Finn, Larry Madin, John Huisman, Katrin Iken, Bernard Picton, and Piotr Kuklinski)
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