Dolphin evo
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Dolphin Evolution Rafael Manrique
Transcript of Dolphin evo
Dolphin Evolution
Rafael Manrique
What is evolutionThe biological model of the history of life on earth
Scientific theory
How is it tracked Phylogenic trees
What are dolphins ?Delphinidae
Mammals
Completetly aquatic
Ecolocation
Indohyus Eariest known sister group
Whale like features
PakicetidaeEarly Eocine 50 million
Caracteristics similar to whales
Freshwater
Ambulocetidae49 million years ago
Fresh/salt water
Hunted in the water
Mandibular foramen
Remingtonocetidae49 to 43 million years ago
Did not ingest fresh water
Swim with tails
Protocetidae Diverse group
More aquatic (some could walk some could not)
Nostril shifting
Audio reception change
Pelvis still conected to spine
Basilosauridaeand Dorudontinae
Could not live on land
Ate fish
Lacked melon – new sinuses
Mandibular foramen
OdontocetesEcholocation
Melons
Social behaviours
One bowhole 75 species
MysticetesBaleen
Large amounts of food
Increment in size
14 species
Modern evolutionCulture
Social networks
Environmental factors
