Mostly marine
loosely organized
sessile
choanocytes
two possible skeletal systems: silicaceous and calcareous
Radial Symmetry
Cnidarians
Annotations:
Carnivores
Nematocyst
blind gut
first animal to have network of nerve fibers
Scyphozoans
{Jelly Fish}
Anthozoans{Sea
anemone, corals}
Reprod
Annotations:
Only a polyp stage
Budding
Hydrozoans{Hydras
and Port Men of
War}
Reprod
Annotations:
Polyp is dominant stage
Made of colonies of polyps
(each polyp serves a different purpose)
zygote-planula-budding-polyp-budding medusa
reproduction
Annotations:
Usually asexual: polyp
Sexual: medusa
The two cycles share similar body plane- mesoglea (which is thicker in the medusa)
Medusa contains the eggs and sperm to make the fertilized egg
Planula is formed from zygote which eventually turns into a polyp
Triploblastic
Protostomes
Lophotrochozoans
Flatworms{platyhelminthes}
Annotations:
No coelom
Bilaterally sym
beating cilia
no circ system
no resp system
nervous system
excretory system
parastic and nonparasitic
Mollusks
Annotations:
foot- muscular locomotion structure
mantle- a fold of tissue that covers the visceral mass and secretes the external shell that protects the whole organism.
visceral mass- the internal organs
reduced coelem
radula- toothed tongue
gills- gas exchange and some filter feeding
mantle cavity- house the gills
Chitans
Bivalves
Gastropods
Cephalopods
Earthworms {Annelids}
Annotations:
segmented
digestive systems (mouth-pharynx-esophagus-crop-gizzard)