Invertebrate animals are defined as animals without backbones. These animals range from the soft bodied sponges and worms to the hard exoskeletoned lobsters and insects.


Sea Sponge
Sea Sponge


Jellyfish
Jellyfish

Sea Anemone
Sea Anemone

Worm
Worm


Invertebrates

Characteristics

Sponges

Bodies full of holes and a skeleton made of spiky fibers. Sponges cannot move so trap animals floating in the water through their "holes".

Corals,

Hydras,

Sea Anemone

Jellyfish

This group has soft tube-like body with a single opening surrounded by armlike parts called tentacles. The tentacles (sometimes poisoned) are used to catch food.

Worms

Tube shaped animals found in land or water environments. Body shapes describe subgroups suck as flatworm, roundworm, and

segmented worms.

Starfish

Sea Urchin

Animals with tiny tube feet arranged around a central body part.

Mollusk

Clam

Snail

Octopus

Squid

Animals with a hard shell, rough tongue, and muscular foot/feet. Octopus and squid have small shells inside their bodies.

Arthropods

Lobsters

Crabs

Insects

Spiders

Centipedes

Millipedes

Animals with jointed legs and hard exoskeleton (no internal bones in their body). Arthropods need to shed their old exoskeleton (molt) in

order to grow larger with a new exoskeleton. Over 1 million different types of Arthropods.

Insect subgroup has three body parts, 6 legs, and can fly. Insects go through a complete metamorphosis (egg-larva-pupa-adult)

Spider subgroup has two body parts and 8 legs. They have fangs and jaws.

Centipedes and Millipedes have have multiple body parts and legs. Centipedes have 175 legs and are carnivores while Millipedes have 240 legs and are herbivores.




Starfish
Starfish

Blueurchin.jpg
Sea Urchin

Octopus
Octopus

Lobster
Lobster


Honey Bee
Honey Bee



Millipede
Millipede