Upload
norma-clark
View
241
Download
5
Embed Size (px)
Citation preview
InvertebrateInvertebratess
1copyright cmassengale
Invertebrate Phyla• Sponges (Porifera)• Cnidarians• Platyhelminthes• Nematodes• Mollusks• Annelids• Echinoderms• Arthropods
2
Sponges (Porifera)• Most primitive• Cells relatively
independent• Mostly marine• No Symmetry
4
Cnidarians• Mostly marine• Radial Symmetry
5
Cnidarians-examples:• Jellyfish• Hydra• Coral• Sea anemone
6
Platyhelminthes• Flatworms• Bilateral
symmetry• Cephalization-
have a head
7
Planarian – freshwater flatworm
8
Regeneration!
Nematodes• Tube-like
digestive tract• Roundworms!• Mouth and anus• No segmentation
9
Mollusks• Clams, snails,
squids• Varied habitats
– Marine– Freshwater– Terrestrial
10
Annelids• Segmented
worms• Common
earthworm• Leech
11
Echinoderms• Always marine• Starfishes, sea
urchins, sea lilies• Spiny skin
12
Brittle Star – An Echinoderm
13
Arthropods• Joint-legged
animals• External skeleton• Huge variation –
mostly insects
14