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Created with Fabric.js 1.4.5 EVOLUTION OF SHARKS 5% Other Shark Evolution SOURCES: 1. 4. Compagno, L. J. (1990). Alternative life-history styles of cartilaginous fishes in time and space. In Alternative life-history styles of fishes (pp. 33-75). Springer Netherlands.6. Donley, Jeanine M.; Sepulveda, Chugey A.; Konstantinidis, Peter; Gemballa, Sven; Shadwick, Robert E. Convergent evolution in mechanical design of lamnid sharks and tunas. Nature. 5/6/2004, Vol. 429 Issue 6987, p61-65. 5p.7. Motta, P. J., & Wilga, C. D. (2001). Advances in the study of feeding behaviors, mechanisms, and mechanics of sharks. In The behavior and sensory biology of elasmobranch fishes: an anthology in memory of Donald Richard Nelson (pp. 131-156). 8. Feretti..Patterns and ecosystem consequences of shark declines in the ocean. Ecology Letters, (2010) 13: 10551071 9. Maisey, JG; Turner, S; Naylor, GJP; Miller, RF. Dental Patterning in the Earliest Sharks: Implications for Tooth Evolution. JOURNAL OF MORPHOLOGY; MAY, 2014; 275; 5; p586-p596,10. Kim, SH; Shimada, K; Rigsby, CK. Anatomy and Evolution of Heterocercal Tail in Lamniform Sharks. ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY; MAR, 2013, 296 3, p433-p442, 10p. TEETH fins are chopped off andthe shark is droppedback in the ocean aliveleft to die Whale Sharks Megladon Sharks have rows of teeth that constantly replace each otherThere are different kinds of shark teeth for different feeding habitsThe teeth are adapted for the diet various species of sharks have developed. Sharks have existed for over 400 million years. Sharks predate the dinosaursAs sharks are cartellagenouss, fossil evidenceof early sharks is from fossilized teeth and a few skin impressions. Cladodonts, an extinct shark species, had double-pointed teeth, shown below, and lived about 360 million years ago (mya). CountershadingFusiform ShapeAmpullae of LorenziniLateral LineGillsDermal DenticlesHeat Exchangers There are now over 400 species of sharks! How Teeth Effect Diet Canopener teeth for prying openKnife teeth with serrated edges for slicing throughFork (pointed) teeth for grabbing Most well-known extinct sharkAn ancient relative of the great white sharkLarger than Whale sharks Adaptations Range Sharks have adapted to living in the shallows along shore as well as in the open ocean and theocean floor. They have adapted body sizes from.2m- 20m, allowing a wide range of temperaturethresholds. Some species, like the bull shark, are even known to swim in salt, fresh and brackish waters. Some sharks don't need teeth! Some have adapted into filter feeders! Filter FeedersLarger than a school busProtected Species Finning is a big problem for sharks. Shark fin soup is thought to have medicinal properties.There are no regulations currently on finning except in the United States.Sharks mature slowly. Reproductive age can be anywhere from 12 to 15 years. Many species only give birth to one or two pups at a time, means that sharks have great difficulty recovering after their populations have declined Kingdom:Phylum:Class:Order: AnimaliaChordataChondrichthyesLamniformes Threats to Evolution of Sharks?
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