Invertebrates
Paige and Dana
This is Paige's and Dana's notes about Invertebrates
Sponges
- reproduce asexually
- can't move once they attach as adults
- gets food from the water around it ( it's environment)
- between inner and outer layer there is a jelly like layer
- grows at almost any depth
- grow on hard surfaces
- there are 5000 known kinds of sponges
Cnidarians
- they can sting their pray to get food.
- they are meat eaters only
- they have special cells in their tentacles that sting and paralyze their pray so they can eat.
- they have tentacles to protect themselves from other animals
- they are symmetrical
- they reproduce sexually and asexually
Flatworms
- They're bilateral symmetrical
- they have a flat body hence the name Flatworm
- they have eyes on the top of their head
- Under a microscope they look cross-eyed
-They are very tiny
-They stay out of the light
Roundworms
Has a round body
Is a parasite
The round worm is very small
Has a distive system with two openings
Has a nervesystem
Reproduce sexually
They live in other things to feed
Segmented worms
Has a heart a brain, a nerve cord, a crop and a gizzard
They breathe though little holes in its body
They have two sets of mucesles
They reproduce sexually
Arthropods
Crustaceans -
arachnids - creatures with eight legs
Insects - insects with two legs
Has a jointed exoskeleton
It mauls to grow
Has a large claw for defence
Mollusks
Mollusk - largest group of inverabrates
Example: snails, octopus sea snail, etc
Characteristics
Has shells
Can live in water or on land
Has a full digestive system
Reproduce sexually
Some can spray black ink
Echinoderms
Echinoderms - are invertebrates that have internal skeletons and spines sticking out from their bodies
examples: starfish, sand dollars, sea urchins, sea cucumbers
Characteristics
Interval skeletons and spines
live only in the ocean
get oxygen from seawater
most adults appear to have radial symmetry
spiny skin
endoskeleton
no head or brain
tube feet
Adaptation - Mouth is at the center of underside with powerful jaws and hidden among their spines and poison glands. They also have tube feet for moving, feeding and sensing respiration