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Emergence of the animal kingdom
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Slide 1

Emergence of the Animal Kingdom

Emergence of the Animal Kingdom

Or Rise of the Chordates

Phylum Chordata

Leading to

Subphylum Vertebrata 

Slide 2

Chordates include the following:

Chordates include the following:

Fish

Reptiles

Amphibians

Birds

Mammals

Slide 3

Chordates

Chordates

4 characteristics

notochord - support

post-anal tail

pharyngeal gill slits

dorsal hollow nerve cord

Slide 4

Chordate Characteristics

Chordate Characteristics

Slide 5

Gills in Humans!  check it out

Gills in Humans! check it out

Slide 6

Tunicates are Chordates!

Tunicates are Chordates!

Sea Squirts

sponge like - filter feeder

larva free swimming, bilateral with all Chordate traits

Slide 7

Lancets (a primitive fish like organism) closely resembles the idealized chordate.

Lancets (a primitive fish like organism) closely resembles the idealized chordate.

The notochord, dorsal nerve cord, numerous gill slits, and post-anal tail all persist in the adult

Copyright 2002 Pearson Education, Inc., publishing as Benjamin Cummings

Slide 8

Ontogency Recapituates Evolution Evolution Playing out in Fetus (all these Chordates (birds, mammals, reptiles, fish, have strikingly similar Embryonic Development)

Ontogency Recapituates Evolution Evolution Playing out in Fetus (all these Chordates (birds, mammals, reptiles, fish, have strikingly similar Embryonic Development)

Slide 9

Tunicates are Chordates!

Slide 10

Chp 33  Rise of the Mammals

Chp 33 Rise of the Mammals

Definition of a Mammal:

Homoeothermic meaning that mammals produce their own body heat

Mammary tissue - for the production of Milk

Hair Follicles - for the production of Hair

Generally, internal fertilization and harboring of young, however, this is only a generality because not all young are cooked to term internally.

Slide 11

Monotremes  an Order of Class Mammalia

Monotremes an Order of Class Mammalia

Monotremes

eg. The Platypus, which has a BILL, lays EGGS, but still has mammary glands and produces MILK for young. This suggests a relationship between REPTILES, BIRDS and mammals. Imagine that?

Slide 12

Marsupials

Marsupials

eg. The Kangaroo, which is a non-placental mammal. Here, the development of the young is very complex, and a baby kangaroo is born very uncooked, and must crawl into the mothers pouch and latch onto a nipple to receive milk to continue development. You might say, baby Kangaroos or Joeys get a womb with a view 

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