Lesson 9-2:
Invertebrates
Worms and Mollusks
Arthropods and Poriferans
Cnidarians and Echinoderms
. . . .

Arthropods

Arthropods are also called joint-legged invertebrates. They account for more than 75% of all animal species. They include the following:

1. Insects (bees, butterflies, flies, cockroaches, mosquitoes, dragonflies, cicadas, fireflies, lice, and others)


Butterfly

Fly

Mosquito

Cockroach

2. Arachnids (spiders, scorpions, and others)


Spider

Scorpion

3. Multi-legged Animals (centipedes, millipedes, and others)


Centipede

Millipede

4. Crustaceans (shrimps, crabs, and others)


Shrimp

Crab