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