We looked at things inside of jars. These things have something in common. They are all part of the phylum: CHORDATA. They are also all in the sub-phylum: VERTEBRAE.
There are 7 classes of vertebrae:
1. Agnatha
2. Chondrichthyes
3. Osteichthyes
4. Amphibia
5. Reptilia
6. Aves
7. Mammalia
The common chordate traits are:
dorsal hollow nerve cord
gills or pharyngeal slits
post anal tail
segmentation
AGNATHA:
-lack jaws
-includes lampreys
-sometimes are parasites
EXOTHERMIC.
CHONDRICHTHYES:
-usually predators
-sharks can sense electrical movements
-nearly all marine
EXOTHERMIC
OSTEICHTHYES:
-bony fishes
-skeletons
-they are buoyant, unlike sharks
-the operculum is a protective flap that allows
the fish to breathe without swimming
EXOTHERMIC
AMPHIBIAN:
-"double life"
-moist skin
-includes metamorphosis
EXOTHERMIC
REPTILIA:
-first evolved amniotic eggs (water containing eggs)
-regulate internal temperature by behavior
EXOTHERMIC
AVES:
-also have amniotic eggs
-they have scales on their feet like reptiles
ENDOTHERMIC
MAMMALIA:
-constant internal temperature
ENDOTHERMIC
three groups of mammals:
1. Monotremes (egg laying mammals)
2. Marsupials (pouched mammals)3. Eutherians (placentas provide long lasting association between mom and child)
hw: Nature due on Friday, 87-93 and extra credit 81-82
scribe: Nick.
the end.
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