Invertebrate
Review for test
Sponge
Sponge - one type of animal that filters the water it lives in to get food.
Example - Venus-Flower Basket,
Characteristics
- reproduce asexually
- can’t move once they attach as adults
- gets food from environment around it.
- between inner and outer layer there is a jelly-like layer
- grow at almost any depth
- grow on hard surfaces
- shaped like fingers, tree branches or round
- filters water to get its food
- 5000 known species
-no real digestive system
Cnidarians
Characteristics
cnidarians -has the ability to sting its prey, carnivorous animals, or meat-eating, poison in tentacles.
Characteristics
-tentacles that sting its predators and bring food to mouth (digestive system)
-waste leaves through mouth
-no organs, cells organized instead of tissues, outer layer is protection and inner layer is -used for digestion
-live in water
-radial symmetry
-Polyp or Medusa Form
-reproduce sexually and asexually
Arthropods
Arthropod - an animal that has a jointed exoskeleton
crustaceans - one kind of arthropod. Lobsters, crabs,
arachnids - spiders, scorpions, mites - have eight legs, no antennae, book lungs
insects - animals with six jointed legs and many have wings (largest group of arthropods)
Characteristics
-exoskeleton covers and protects body and gives it support
-jointed legs
-jointed body
-digestive system with 2 openings
-circulatory system and a brain
-molts so exoskeleton can grow with animal
-well developed organs for site, sound and touch
Flatworms
Flatworm - has a flattened body, a digestive system with only one opening, and a simple nervous system. Example: Planarian
Characteristics
-flattened body
-digestive system with only 1 opening and simple nervous system
-live in both freshwater and saltwater
-bilateral symmetry
-sense organs and nerve cords
-a mouth and digestive system
-can regenerate body parts that have been cut off.
Roundworms
Roundworm - a worm with a round, tube like body. Most are too small to be seen.
Example: hookworm
Characteristics
-digestive system with 2 openings
-take in food and eliminate waste
-muscles that run length of body
-reproduce sexually
-nervous system with brain and simple sense organs
Segmented worms
Segmented Worms - These are worms whose bodies are made up of connected sections, or segments. Example: earthworm.
Characteristics
-body made up of connected segments
-circulatory system - 5 enlarged tubes that act like hearts
-nervous system - brain and main nerve
-breath through skin
-two sets of muscles that allow it to move
-takes in food through mouth
-reproduce sexually
Mollusk
Mollusk - an animal with a soft body and no bones.
Example: clams, oysters, slugs, snails, squids and octopods
Characteristics
-some have a hard shell that protects their body
-Mantle - shell of mollusk, produces material to harden shell, grows as animal grows
-some the mantle is a tough layer of skin
-muscular foot - helps move and burrow into ocean floor
-reproduce sexually
-some have bivalves like oysters and clams
-Radula - organ in snail that acts like a tongue with sharp teeth
-octopus and squid have well developed brains and nervous systems
Echinodrems
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