PinnipedSystematicsSpring08

PinnipedSystematicsSpring08 - Systematics of Pinnipeds...

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Unformatted text preview: Systematics of Pinnipeds Pinnipeds Facts • Probably most numerous marine mammal group • ~50 million world wide • 90% phocids • Found in all major oceans (& some freshwater) • All have amphibious lifestyle Kingdom Animalia Phylum Chordata SubPhylum Vertebrata Class Mammalia Pinnipeds • Order Carnivora • Sub-order Pinnipedia (34 species) –Family Odobenidae • Walrus –Family Otariidae • Fur seals & sea lions –Family Phocidae • True or earless seals Family Odobenidae Walrus Family Odobenidae Walrus • Single species – Odobenus rosmarus • No external ear structures • Swims with hind flippers • Can walk on all four (reflects hind limbs forward) Circumarctic distribution Family Otariidae • Sub-family Arctocephalinae • Fur seals (9 species) • Sub-family Otariinae • Sea lions (5 species) Family Otariidae (14 sp) • Walk on all four limbs (reflect hind limbs forward) • Swim with fore flippers Family Otariidae (14 sp) • Scratch with hind limbs • External ear pinnae • More hair/fur • Sexually dimorphic Family Otariidae (14 sp) Northern fur seal Callorhinus ursinus Callorhinus ursinus Males up to 6x larger than females Callorhinus ursinus Over 70% of breeding population Southern Fur Seals...
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This note was uploaded on 04/15/2008 for the course BIO 139 taught by Professor Costa during the Spring '08 term at UCSC.

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PinnipedSystematicsSpring08 - Systematics of Pinnipeds...

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