Phyla Porifera, Cnidaria, Platyhelminthes, and Nematoda

Which phyla consists of asymmetrical organisms with no specialized tissues?

• Porifera

• Cnidaria

• Platyhelminthes

• Nematoda

This phylum consists of sessile sponges.

• Porifera

• Cnidaria

• Platyhelminthes

• Nematoda

This phylum consists of radially symmetrical diploblastic organisms.

• Porifera

• Cnidaria

• Platyhelminthes

• Nematoda

Organisms in this phylum have specialized cells known as cnidocytes, which are stinging cells that are typically concentrated around the mouth and tentacles of the animal.

• Porifera

• Cnidaria

• Platyhelminthes

• Nematoda

This body plan in phylum Cnidaria is typically sessile as adults, like in this picture.

• polyp

• medusa

• bilaterally symmetrical

• asymmetrical

This body plan in phylum Cnidaria is typically motile as adults, with a mouth and tentacles hanging from their bell-shaped bodies, like in this picture.

• polyp

• medusa

• bilaterally symmetrical

• asymmetrical

This phylum can be divided into four classes: Anthozoa, Scyphozoa, Cubozoa, and Hydrozoa.

• Porifera

• Cnidaria

• Nematoda

• Platyhelminthes

This class of phylum Cnidaria includes only sessile polyps, such as sea anemones and corals.

• Anthozoa

• Cubozoa

• Scyphyozoa

• Hydrozoa

This class of phylum Cnidaria includes all the jellies, with mainly medusa body plans.

• Scyphyozoa

• Anthozoa

• Cubozoa

• Hydrozoa

This class of phylum Cnidaria includes jellies that are square in cross section with only about 20 species.

• Anthozoa

• Cubozoa

• Scyphozoa

• Hydrozoa