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Carnivore Evolution & Systematics
MARE 390Dr. Turner
Order Carnivora
5 Families of Marine Mammals
Mustelidae – Sea otterUrsidae – Polar bearPhocidae – Seals (true seal)Otariidae – Sea lions (eared seals)Odobenidae - Walrus }
Pinnipeds
Order CarnivoraAlternative hypotheses for relationships among carnivores
Order CarnivoraMost debate centers around walrus
Order CarnivoraRelationship among carnivores
Morhpological Molecular
Enhydra lutris Lutra lutra
Family Mustelidae
Family Ursidae
Suborder Pinnipedia“feather-footed”
34-36 species – (25% of marine mammals)
19 Phocids
14-16 Otariids1 Odobenid }
Do the EvolutionAdapted to an aquatic existence:
1. Large infraorbital foramen2. Shortened & robust humerus/femur3. Flattened ulna & radius, tibia & fibula4. Elongate digits (I-hand) (I&V-foot)5. Heterodont progressing toward
homodont
Early PinnipedsPinnipedimorph -
Fore & hind flippersmodified forswimming
Spent more time on land than
extant pinnipeds
Early PinnipedsOdobenids – evolved in the North Pacific
during early Miocene – 18 mya
Otariids – evolved in eastern North Pacific during middle Miocene – 11-12 mya
Phocids – evolved in North Pacific during late Miocene – 18 mya
Continents in Early Miocene(20mya)
1- Early pinnipeds 4- Early pinnipeds
Continents in Middle Miocene(12mya)
1- Early phocids, 2 – Monachines & Odobenids, 3-4 - Phocines
Early PinnipedsMonachine seals – evolved in the North
Atlantic (Mediterranean); 1st dispersal to Caribbean, then Hawaii
Phocine seals – evolved in North Atlantic; many in arctic
Ribbon seals evolved in North Pacific, later separated by sister taxa (harp) in the North Atlantic
Bear Pinnipedimorph Otariid Odobenid Phocid
Meet the Pinnipeds
Otariid Odobenid Phocid
Meet the Pinnipeds
Meet the Pinnipeds
Otariid Phocid
Odobenid
Family Otariidae“eared seals” – external ear flaps (pinnae)
California sea lion (O) Hawaiian monk seal (P)
Family OtariidaeTurn hindflippers forward to walk on land
Family OtariidaeOtariids smaller than most phocids
Northern elephant seal (P)Steller’s seal lion (O)
Family OtariidaeShallower divers than phocids
Harbor seal (P)California seal lion (O)
Family OtariidaeDivided into 2 subfamilies:Otariinae (sea lions) & Arctocephalinae (fur seals)
Otariinae (5 genera) Eumetopias, Neophoca, Otaria, Zalophus, Phocarctos
Arctocephalinae (2 genera) Arctocephalus, Callorhinus
Family Otariidae
Extinct Genera
Fur Seals
Sea Lions
Subfamily Otariinae – Sea Lions - Pelage sparse
Subfamily Arctocephalinae – Fur seals - Dense pelage
Family Otariidae
Subfamily OtariinaeEumetopias jubatus- Steller’s sea lion
Neophoca cinerea- Australian sealion
Subfamily OtariinaeOtaris byronis - Southern sea lionOtaria flavescens – South American sea lion
Phocartos hookeri - New Zealand sea lion
Zalophus californianus - California sea lion
Subfamily ArctocephalinaeArctocephalus australis- South American fur seal
Arctocephalus forsteri- New Zealand fur seal
Arctocephalus galapagoensis- Galapagos fur seal
Subfamily ArctocephalinaeArctocephalus gazella- Antarctic fur seal Arctocephalus philippi- Juan Fernandez fur seal
Arctocephalus pusillus- Cape-Australian fur sealtwo subspecies: Cape fur seal - A. pusillus pusillus Australian fur seal - A. pusillus doriferus
Subfamily ArctocephalinaeArctocephalus townsendi- Guadelupe fur seal
Arctocephalus tropicalis- Subantarctic fur seal
Callorhinus ursinus- Northern fur seal
Family Odobenidae
1 species – Odobenus rosmarus - 2 subspecies*
Odobenus r. rosmarus – N. AtlanticOdobenus r. divergens – N. Pacific(Odobenus r. laptevi – Laptev Sea)
Odobenid Classification
Otariid Odobenid
Although tusks (elongate canines) are the most distinguishing trait – evolved from a single line
Odobenid ClassificationArchaic walruses had enlarged canines and narrow premolars – indicative of piscivory rather than specialized mollusk diet today
- more similar to Otariids & Phocids
Odobenid Classification
Divided into 2 subfamilies:Monachinae (monk, elephant, Antarctic)Phocinae (remaining N. Hemisphere seals)
Monachinae (6 genera) Monachus, Mirounga, Lobodon, Ommatophoca, Hydrurga, Leptonychotes
Phocinae (6 genera) Phoca, Histriophoca, Halichoerus, Erignathus, Pagophilus, Cystophora
Family Phocidae
Family Phocidae
Lobodon carcinophagus- crabeater seal
Ommatophoca rossii- Ross seal
Hydrurga leptonyx- leopard seal
Leptonychotes weddellii- Weddell seal
Subfamily Monachinae
Monachus monachus- Mediterranean monk seal
Monachus schauinslandi - Hawaiian monk seal
Monachus tropicalis- Caribbean (West Indian) monk seal
Subfamily Monachinae
Mirounga leonina- southern elephant seal
Mirounga angustirostris- northern elephant seal
Subfamily Monachinae
Phoca vitulina- harbor (common) seal
Phoca largha- largha (spotted) seal
Phoca hispida- ringed seal
Phoca sibirica- Baikal seal
Phoca caspica- Caspian seal
Subfamily Phocinae
Histriophoca fasciata- ribbon seal Halichoerus grypus - grey (gray) seal Erignathus barbatus - bearded seal Pagophilus groenlandicus - harp seal
Cystophora cristata -hooded seal
Subfamily Phocinae
The study of pinniped evolutionary relationships has identified a group of fossil pinnipeds – Desmatophocids
Where’s Walrus
I am the EggmanDesmatophocids have recently been determined to be the common ancestors of phocids
Contradicts previous works which recognized Desmatophocids as otariid pinnipeds
Most morphological data support a phocid & walrus alliance
Molecular data consistently supports uniting otariids & walrus
GOO GOO GOO JOOB“I haven't been this slim since High School” – Homer Simpson