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Robert Feranec Curator of Vertebrate Paleontology, NYSM TOTALLY AWESOME: Extreme Evolution in Mammals—YEAH!! (with fist pump)
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EXTREME!!! Who’s the Biggest? Who’s the Smallest? Who’s the Baddest? Best Common Name? Best Scientific Name?
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Who’s the Biggest?: Paraceratherium Age: 30 million years ago Height: upto 23 feet tall (15 feet at shoulder) Weight: upto 20 tons EXTREME!!!
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Who’s the Smallest?: Batodonoides Age: 53 million years ago Height: small Weight: 1.3 grams EXTREME!!!
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Best Scientific Name?: Sunkahetanka pahinsintewakpa Age: 28 million years ago Weight: 20 kgs EXTREME!!! Hesperocyonidae (distant canid relative)
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Best Common Name?: Gunther’s Dik Dik Age: Modern Height: upto 40 cm Weight: upto 5 kgs EXTREME!!!
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EXTREME?
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Head Gear EXTREME!!!
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Why Head Gear? Defense: Combat: Mate Recognition: Ornamentation: EXTREME!!!
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Natural Selection Differential survival and reproduction
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Sexual Selection Certain evolutionary traits are the result of intraspecific competition Intrasexual Competition: Generally Male- Male competition, female mates with the “winner” Intersexual Competition: Female Choice EXTREME!!!
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Types of Head Gear? Ossicones: Horns: Antlers: Pronghorns: EXTREME!!!
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Head Gear: Ossicones EXTREME!!!
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Head Gear: Ossicones Fossils Sivatherium ~8,000 years ago Samotherium ~4 million years ago EXTREME!!!
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Head Gear: Horns EXTREME!!!
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Head Gear: Horns Fossils Hoplitomeryx Syndoceras Synthetoceras Bison latifrons EXTREME!!! Cranioceras
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Head Gear: Horns Fossils Arsinoitherium (from Egypt) Age: 35 Ma Height: ~7 feet at shoulder EXTREME!!!
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Head Gear: Horns Fossils EXTREME!!!
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Head Gear: Horns Fossils: Brontotheriidae EXTREME!!!
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Mylagaulid rodents Why do they have those crazy horns? 30-5 Ma North America EXTREME!!!
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Mylagaulid Ecology Herbivorous Body size: ~ 0.5-5 kg. Fossorial (burrowing), but how? One of the only fossorial animals with horns Millions of years ago EXTREME!!!
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Fossorial adaptation in rodents Figure from Stein 2000 Scratch digging Chisel tooth digging Head lift digging EXTREME!!!
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Head digging in mylagaulids Features consistent with head- digging: Thickened, projecting nasal bones Tall, forward-tilted occipital plate Shortened skull Powerful forelimbs EXTREME!!! Likely evolved from head-lift diggers
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Why horns? Possible uses of horns: Species recognition Digging Sexual display/combat Defense EXTREME!!!
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Horns : digging implement In favor: Higher occipital plate with taller horns Against: Position, orientation of horns Change in horns through time Increases force needed to dig CONCLUSION: unlikely EXTREME!!!
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Horns : sexual display/combat Not sexually dimorphic Lack of visual ability Display useless underground Orientation of horns CONCLUSION: unlikely EXTREME!!!
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Horns : defense Passive or active defense Predator diversity: mustelids (weasels and stoats), snakes? CONCLUSION: Likely, consistent with available evidence. EXTREME!!!
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Horns…or Not Horns Coelodonta Late Pleistocene (~20,000 years ago) Europe EXTREME!!!
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NOT “true” horns Coelodonta Late Pleistocene (~20,000 years ago) Europe EXTREME!!!
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Horns…or Not Horns EXTREME!!!
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Horns EXTREME!!!
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Horns…or Not Horns Narwhal (modern) EXTREME!!!
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NOT Horns EXTREME!!!
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Head Gear: Pronghorns Antilocapra americana EXTREME!!!
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Head Gear: Pronghorns Fossils Merycodus 15 Mya Ramoceros 12 Mya Ilingoceros 8 Mya EXTREME!!!
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Head Gear: Antlers EXTREME!!!
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Head Gear: Antlers EXTREME!!!
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Head Gear: Antlers Fossils Megaloceros giganteus ~10000 years ago Each antler is 6ft long EXTREME!!!
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Antlers and… EXTREME!!!
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Antlers and… Saberteeth!!! Moschus Modern EXTREME!!!
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Why Head Gear? Defense: Combat: Mate Recognition: Ornamentation: EXTREME!!!
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Evolution of saberteeth Thylacosmilus Smilodon Eusmilus Machaerodus Machaeroides Homotherium EXTREME!!!
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From Akersten 1985 EXTREME!!! Eating!
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Homotherium Smilodon Is the evolution of the sabertooth convergent evolution or parallel evolution?
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Convergent Evolution vs. Parallel Evolution? Convergent Evolution: describes the acquisition of the same biological trait in unrelated lineages. Parallel Evolution: the development of a similar trait in different not closely related species (that is in species of a different clade), but descending from the same ancestor.
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Question: How do we distinguish how closely an organism is related? How to Solve this? Hall (2003) Biological Reviews
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Question: How do we distinguish how closely an organism is related? How to Solve this? Convergence: Similarity arising through independent evolution having different developmental pathways Parallelism: A feature present in closely related organisms but not present continuously in all members of the lineage, and uses similar developmental pathways. Hall (2003) Biological Reviews
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Evolution of saberteeth How do they develop? Thylacosmilus Machaerodus EXTREME!!!
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You are what you eat…and drink
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Isotopes in modern precipitation 18 O SMOW August January FLAGSTAFF, AZ 1961-1963 From IAEA GNIP Database + 18 O - 18 O Oxygen Isotopes (Isotope: same # of P, E- but different # of N)
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+ 18 O - 18 O Summer Winter Predicted cyclicity in oxygen isotope values of enamel carbonate TipBase
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+ 18 O - 18 O TipBase 12 months Predicted cyclicity in oxygen isotope values of enamel carbonate 25mm 85mm 60 mm
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18 O value Isotope values for S. fatalis Distance from enamel-root contact (mm) Average: 66 mm / 12 months = 5.5 mm per month Feranec, in prep
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Panthera tigris 2 Panthera leo 1 Smilodon gracilis ~12 months 18 months 9-14 months 6.7 mm/month 3 mm/month 9 mm/month Comparison in Felid canine development 1. Smuts et al., 1978 2. Mazak, 1981 Smilodon fatalis ~18 months5-7 mm/month Homotherium serum ~15 months 2.5 mm/month Panthera leo >18 months2.8 mm/month Panthera atrox >18 months 2.9 mm/month TAXON DURATION OF GROWTH RATE Feranec. 2004, 2005, 2008
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EXTREME!!! Convergent Evolution
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EXTREME!!! Who’s the Biggest? Who’s the Smallest? Who’s the Baddest? Best Common Name? Best Scientific Name?
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Who’s the Baddest?: 2010 Championship Winner 4. Smilodon populator 1. Ursus maritimus tyrannus 2. Andrewsarchus mongoliensis 3. Daeodon hollandi EXTREME!!!
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Who’s the Baddest?: V. 6 ft. tall at shoulder Weighs up to 2000 lbs 4ft. tall at shoulder Weighs up to 1300 lbs 4. Smilodon populator 1. Ursus maritimus tyrannus EXTREME!!!
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Who’s the Baddest?: EXTREME!!!
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Who’s the Baddest?: Polar Bear Wins!! EXTREME!!!
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Who’s the Baddest?: 2. Andrewsarchus mongoliensis3. Daeodon hollandi Height: up to 8 ft at shoulder Length: 11 feet long Weight: up to 2200 lbs. Age: 40 Ma Height: up to 7 ft at shoulder Length: 12 feet long Weight: up to 2200 lbs. Age: 25 Ma V. EXTREME!!!
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Who’s the Baddest?: EXTREME!!! Andrewsarchus mongoliensisDaeodon hollandi
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Who’s the Baddest?: Andrewsarchus Wins!! EXTREME!!!
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Who’s the Baddest?: Winner 1. Ursus maritimus tyrannicus 4. Smilodon fatalis 1. Ursus maritimus tyrannicus 2. Andrewsarchus mongoliensis 2. Daeodon hollandi EXTREME!!!
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Who’s the Baddest?: V. 6 ft. tall at shoulder Weighs up to 2000 lbs Can stand up to 11 feet tall 1. Ursus maritimus tyrannus 2. Andrewsarchus mongoliensis Height: up to 8 ft at shoulder Length: 11 feet long Weight: up to 2200 lbs. EXTREME!!!
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Who’s the Baddest?: Size Comparison EXTREME!!!
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Who’s the Baddest?: EXTREME!!! Ursus maritimus tyrannus!!!
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Thank you EXTREME!!!
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