Classification of Animals

Animals are grouped according to common

Animals are grouped according to common body features. The two broad groups are invertebrates, which do not have a backbone, and vertebrates, which ha

Invertebrates are animals without a backbone

Invertebrates are animals without a backbone. They are divided into eight phyla: Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda,

Porifera are pore

Porifera are pore-bearing animals. Their bodies have many tiny pores for water intake and one large pore for water outflow. Sponge is a common example

Cnidarians are aquatic animals with

Cnidarians are aquatic animals with a hollow sac-like body, one opening, and tentacles around the mouth. Their body is radially symmetrical. Jellyfish

Platyhelminthes are flatworms with thin

Platyhelminthes are flatworms with thin, flattened bodies. They are mostly parasitic. Tapeworm and liver fluke are examples.