Early Whales
1) Maiacetus
Time period : 49 - 40 millon years ago
• Maiacetus probably spent much of its life in the water
...
2) Basilosaurus cetoides
Time period : 40 - 35 millon years ago
• With a streamlined body and paddle-like forelimbs
show B...
3) Llanocetus denticrenatus
Time Period : 35 – 30 million years ago
• A skull from the oldest known filter feeding whale
r...
Whales- a brief synopsis
• Whales swim , but their ancestors walked .
• All modern mysticetes are large filter-feeding or
...
• All cetaceans, including whales, dolphins and porpoises, are
descendants of land-dwelling mammals of the Artiodactyl
ord...
• These primitive cetaceans first took to the sea about 50
million years ago and became fully aquatic about 5–10
million y...
Summary picture
Presentation (evolution of whales)
Presentation (evolution of whales)
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Presentation (evolution of whales)

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Presentation (evolution of whales)

  1. 1. Early Whales 1) Maiacetus Time period : 49 - 40 millon years ago • Maiacetus probably spent much of its life in the water , returning to land only to mate and give birth. • It had flipper like limbs , similar to those of a modern sea or walrus and like some seals .
  2. 2. 2) Basilosaurus cetoides Time period : 40 - 35 millon years ago • With a streamlined body and paddle-like forelimbs show Basilosaurus was a fast swimmer. • Small hind limbs reveal that it descended from land – dwellers . Scientists first thought that it was a reptile and had named it “regal lizard “
  3. 3. 3) Llanocetus denticrenatus Time Period : 35 – 30 million years ago • A skull from the oldest known filter feeding whale revealed an intermediate step in the evolution of mysticeti (baleen whales) . • Its teeth and”baleen” formed a sieve that kept tiny plankton in while letting water out.
  4. 4. Whales- a brief synopsis • Whales swim , but their ancestors walked . • All modern mysticetes are large filter-feeding or baleen whales, though the exact means by which baleen is used differs among species .
  5. 5. • All cetaceans, including whales, dolphins and porpoises, are descendants of land-dwelling mammals of the Artiodactyl order (even-toed ungulates). • Both are related to the Indohyus, an extinct semi-aquatic deer-like ungulate, from which they split around 54 million years ago.
  6. 6. • These primitive cetaceans first took to the sea about 50 million years ago and became fully aquatic about 5–10 million years later. • Their features became adapted for living the marine environment.
  7. 7. Summary picture
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