Animal Kingdom - PowerPoint by rebecca9588

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									        Emergence of the Animal

                Or “Rise of the Chordates”
                    Phylum Chordata
                        Leading to
                 Subphylum Vertebrata 

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Chordates include the following:

         1.   Fish
         2.   Reptiles
         3.   Amphibians
         4.   Birds
         5.   Mammals
–   4 characteristics
    1. notochord - support
    2. post-anal tail
    3. pharyngeal gill slits
    4. dorsal hollow nerve cord
Chordate Characteristics
Gills in Humans! – check it out
      Tunicates are Chordates!
         Sea Squirts

• sponge like - filter feeder

•larva free swimming,
bilateral with all 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
   “Ontogency Recapituates
Evolution Playing out in Fetus…

   (all these Chordates (birds,
  mammals, reptiles, fish, have
          strikingly similar
    Embryonic Development)
       Chp 33 – Rise of the Mammals

• Definition of a Mammal:
1. Homoeothermic – meaning that mammals
   produce their own body heat
2. Mammary tissue - for the production of Milk
3. Hair Follicles - for the production of Hair
4. Generally, internal fertilization and harboring
   of young, however, this is only a generality
   because not all young are “cooked” to term
       Monotremes – an Order of Class

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?

– 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 mother’s
   pouch and latch onto a nipple to receive milk to
   continue development. You might say, baby
   Kangaroos or “Joey’s” get a womb with a view 
Kangaroo Birth

                 17 Weeks
             Placental Mammals

– eg. You – well if you’re female, anyway. Internal
    Fertilization development of young to a highly
    Advanced stage.
The Placenta is Key
 In Mammals, all the Major Body
Systems are online and advanced
Skeletal System
Muscular System
Advanced Circulatory System
Respiratory System
Nervous System is online and
Excretory System – ooo look,
Endocrine System – Controls
      you Hormones
Lots of Mammals in the Simpsons
  Lastly, we can Learn Important
Lessons from Mammals like Homer

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