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  #1  
Old 09-11-2004, 10:24 PM
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Default What about the dolphin?

I was wondering if an evolutionist could explain this to me. I was wondering why a dolphin would evolve into a mammal and then revert back to the water. I am not claiming this to be a fallacy of evolution, I would judt like to know more on the subject.
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  #2  
Old 09-11-2004, 10:40 PM
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because during the great extinction all the large water preditors like the Icthyosaurs, Pleaiosaurs and the giant sharks died out. With this eccological niche open the oceans were full of food just waiting for something to come allong and eat them. It was a perfect place for the whales to go, few predators save for the occasional shark, and an almost limitless source of food.

it seemes to me to be the perfect reason to go back to the water.

Thats why should people build boats and try to exploit the same resource.

here is a website that should help... Dr. Thewissen is a renowed expert on Cetaciean evolution.
http://darla.neoucom.edu/DEPTS/ANAT/Thewissen/

wa:do
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  #3  
Old 09-11-2004, 10:47 PM
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but it seems like with the limitless source of food more species would have gone back into the water
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Old 09-11-2004, 10:49 PM
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whales (baleen and toothed), seals (true and fur), otters (sea and marine), manatees and Dugongs... there are quite a few.

wa:do
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  #5  
Old 09-11-2004, 11:10 PM
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Family Balaenidae (bowhead whales and right whales)
Family Balaenopteridae (finner whales and rorquals)
Family Delphinidae (dolphins, killer whales, marine dolphins, melon-headed whales, pilot whales, and relatives)
Family Eschrichtiidae (gray whale and grey whales)
Family Monodontidae (beluga, narwhal, and white whales)
Family Neobalaenidae (pygmy right whale)
Family Phocoenidae (porpoises)
Family Physeteridae (sperm whales)
Family Platanistidae (river dolphins)
Family Ziphiidae (beaked whales)

And heres a list of all the species, but don't forget that there are many, many sub-species in cetacean species.

Suborder ARCHAEOCETI (archaeocetes or zeuglodonts) - EXTINCT
Family PROTOCETIDAE
(Fossil only - Lower to upper Eocene).
Family DORUDONTIDAE
(Fossil only - Upper Eocene to lower Miocene).
Family BASILOSAURIDAE
(Fossil only - Upper Eocene to lower Oligocene).
Suborder ODONTOCETI (toothed whales)
Family AGOROPHIIDAE - EXTINCT
(Fossil only - Upper Eocene).
Family SQUALODONTIDAE - EXTINCT
(Fossil only - Upper Oligocene to lower Pliocene).
Family PLATANISTIDAE
(River dophins - Lower Miocene to Recent).
Genus PLATANISTA
Species P. GANGETICA
Ganges River Dolphin
Species P. MINOR
Indus River Dolphin
Genus PLATANISTIDAE
Species I. GEOFFRENSIS
Amazon River Dolphin
Genus LIPOTES
Species L. VEXILLIFER
Chinese River Dolphin
Genus PONTOPORIA
Species P. BLAINVILLEI
Franciscana Dolphin
Family ZIPHIIDAE (formerly Family Hyperoodontidae)
(Beaked whales - Lower Miocene to Recent).
Genus BERARDIUS
Species B. BAIRDII
Baird's Beaked Whale
Species B. ARNUXII
Arnoux's Beaked Whale
Genus TASMACETUS
Species T. SHEPHERDI
Shepherd's Beaked Whale
Genus ZIPHIUS
Species Z. CAVIROSTRIS
Cuvier's Beaked Whale
Genus HYPEROODON
Species H. AMPULLATUS
Northern Bottlenose Whale
Species H. PLANIFRONS
Southern Bottlenose Whale
Genus MESOPLODON
Species M. PACIFICUS
Longman's Beaked Whale
Species M. HECTORI
Hector's Beaked Whale
Species M. MIRUS
True's Beaked Whale
Species M. EUROPAEUS
Gervais' Beaked Whale
Species M. GINDGODENS
Ginkgo-Toothed Beaked Whale
Species M. GRAYI
Gray's Beaked Whale
Species M. CARLHUBBSI
Hubbs' Beaked Whale
Species M. STEJNEGERI
Stejneger's Beaked Whale
Species M. BOWDOINI
Andrews' Beaked Whale
Species M. BIDENS
Sowerby's Beaked Whale
Species M. LAYARDII
Strap-Toothed Whale
Species M . DENSIROSTRIS
Blainville's Beaked Whale
Family PHYSETERIDAE (Sperm Whales - Lower Miocene to Recent).
Genus PHYSETER
Species P. MACROCEPHALUS
Sperm Whale
Genus KOGIA
Species K. BREVICEPS
Pygmy Sperm Whale
Species K. SIMUS
Dwarf Sperm Whale
Family MONODONTIDAE (Narwhal and Beluga - Pleistocene to Recent).
Genus DELPHINAPTERUS
Species D. LEUCAS
Beluga
Genus MONODON
Species M. MONOCEROS
Narwhal
Family PHOCOENIDAE (Porpoises - Upper Miocene to Recent).
Genus PHOCOENA
Species P. PHOCOENA
Harbor Porpoise
Species P. SINUS
Gulf of California Harbor Porpoise
Species P. DIOPTRICA
Spectacled Porpoise
Species P. SPINIPINNIS
Burmeister's Porpoise
Genus NEOPHOCAENA
Species N. PHOCAENOIDES
Finless Porpoise
Genus PHOCOENOIDES
Species P. DALLI
Dall's Porpoise
Family DELPHINIDAE (Dolphins and killer whales - Lower Miocene to Recent).
Genus STENO
Species S. BREDANENSIS
Rough-Toothed Dolphin
Genus SOUSA
Species S. CHINENSIS
Indo-Pacific Hump-Backed Dolphin
Species S. TEUSZII
Atlantic Hump-Backed Dolphin
Genus SOTALIA
Species S. FLUVIATILIS
Tucuxi Dolphin
Genus TURSIOPS
Species T. TRUNCATUS
Bottlenose Dolphin
Genus STENELLA
Species S. LONGIROSTRIS
Spinner Dolphins
Species S. CLYMENE
Short-Snouted Spinner Dolphin
Species S. PLAGIODON
Atlantic Spotted Dolphin
Species S. ATTENUATA
Spotted Dolphin
Species S. COERULEOALBA
Striped Dolphin
Genus DELPHINUS
Species D. DELPHIS
Common Dolphin
Genus LAGENODELPHIS
Species L. HOSEI
Fraser's Dolphin
Genus LAGENORHYNCHUS
Species L. ALBIROSTRIS
White-Beaked Dolphin
Species L. ACUTUS
Atlantic White-Sided Dolphin
Species L. OBLIQUIDENS
Pacific White-Sided Dolphin
Species L. OBSCURUS
Dusky Dolphin
Species L. AUSTRALIS
Peale's Dolphin
Species L. CRUCIGER
Hourglass Dolphin
Genus CEPHALORHYNCHUS
Species C. COMMERSONII
Commerson's Dolphin
Species C. HEAVISIDII
Heaviside's Dolphin
Species C. EUTROPIA
Chilean Dolphin
Species C. HECTORI
Hector's Dolphin
Genus LISSODELPHIS
Species L. BOREALIS
Northern Right Whale Dolphin
Species L. PERONII
Southern Right Whale Dolphin
Genus GRAMPUS
Species G. GRISEUS
Risso's Dolphin
Genus PEPONOCEPHALA
Species P. ELECTRA
Melon-Headed Whale
Genus FERESA
Species F. ATTENUATA
Pygmy Killer Whale
Genus PSEUDORCA
Species P. CRASSIDENS
False Killer Whale
Genus GLOBICEPHALA
Species G. MALAENA
Long-Finned Pilot Whale
Species G. MACRORHYNCHUS
Short-Finned Pilot Whale
Genus ORCINUS
Species O. ORCA
Killer Whale
Genus ORCAELLA
Species O. BREVIROSTRIS
Irrawaddy Dolphin
Family STENIDAE (Long-snouted dolphins - Lower Miocene to Recent).
Family EURHINODELPHIDAE (Fossil only - Miocene).
Family HEMISYNTRACHELIDAE (Fossil only - Miocene).
Family ACRODELPHIDAE (Fossil only - Miocene).
Suborder MYSTICETI (baleen, or whalebone, whales)
Family AETIOCETIDAE
Family PATRIOCETIDAE
Family CETOTHERIIDAE
Family ESCHRIDHTIIDAE
Genus ESCHRICHTIUS
Species E. ROBUSTUS
Gray Whale
Family BALAENIDAE
Genus EUBALAENA
Species E. GLACIALIS
Right Whale
Genus BALAENA
Species B. MYSTICETUS
Bowhead Whale
Genus CAPEREA
Species C. MARGINATA
Pygmy Right Whale
Family BALAENOPTERIDAE
Genus BALAENOPTERA
Species B. MUSCULUS
Blue Whale
Species B. PHYSALUS
Fin Whale
Species B. BOREALIS
Sei Whale
Species B. EDENI
Bryde's Whale
Species B. ACUTOROSTRATA
Minke Whale
Genus MEGAPTERA
Species M. NOVAEANGLIAE
Humpback Whale
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  #6  
Old 09-11-2004, 11:14 PM
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thank you all for the clarification on this topic. Again, this was not to bash evolution I only wished to seek more information.
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  #7  
Old 09-11-2004, 11:19 PM
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No problem.
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Old 09-12-2004, 12:00 AM
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I see Druidus gave you all 81 species of the whale family
There are also 33 species of pinnipeds (seals and kin)
Two species of marine otter
One species of marine bear (the polar bear is classified as a marine mammal)
Four surviving species of Sirenians (manatee and kin)

for a grand total of 121 species... Just incase you were curious

wa:do
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  #9  
Old 09-12-2004, 12:03 AM
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Quote:
marine bear
I thought they were only semi-marine.
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  #10  
Old 09-12-2004, 12:14 AM
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they depend almost solely on the marine environment for thier survival and spend a great deal of time in the water themselves... so they have recently been added to the list of marine mammals... No ocean no polar bear.

according to The International Marine Mammal Association, National Marine Mammal Laboratories and other groups.

wa:do
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