Heterotrophs
consume other oranisms
What happened 525 million years ago?
Cambrian Explosion: Animal Diversification
Followed by mass extinction
Hypotheses of Cambrian explosion
- Predator prey interaction
-adaption
3 types of Body symmetry
Radial- (all around)
Bilateral - (in half) ex. lobster
Asymmetrical- no body symmetry
cephalization
Central nervous system in head region
All animals have which type of cells?
Eukaryotic
What does Phylum Porifera mean?
pore-bearing
Characteristics of Sponges
-sessile: stationary
-Assymmetrical
-Lack true tissues
- Hermaphrodites
Sponge anatomy
-Osculum
-Spongocoel
-choancytes
-amoebocytes
Osculum
Sponge opening
Spongocoel
Internal cavity
Porocytes
Water channels
Choanocytes
Feeding cells
amoebocytes
Transport
Phylum Cnidaria consists of
Jellyfish, anemones, and corals
Cnidaria body plan characteristics
-Gastrovascular cavity
-Radially Symmetric
-sessile and floating
Phylum Cnidaria:Morpholoy (2 Morphological forms)
-Polyp
-Medusa
Stinging Cells on Jellyfish
-Nematocysts
Hydrozoans, what are they?
Alteranate between medusa and poly
Ex. Portuguese man-of-war
Scyphozoans
-jellyfish
-Dominant stande- Medusa
Cubozoans
cube-shaped jellyfish
Highly toxic nematocysts
Anthozoans
-Sea anemones and corals
-Dominant stage : polyps
Zooxanthellae
symbionts w/ corals
-Photosynthesize to provide nutrient to polyp animal
-Polyp animal provides habitat and nutrients from feeding