Key Characteristics + Cnidaria

Germ Layers

100

This phylum does not have any germ layers

Phylum Porifera

200

This phylum is the only diploblast

Cnidaria

300

In this type of triploblast, the mesoderm completely lines both the endoderm and ectoderm and creates a hole

Eucoelomate

400

In this type of triploblast, the mesoderm fills the space between the endoderm and the ectoderm

Acoelomate

500

In this type of triploblast, the mesoderm only partially lines the endoderm but completely lines the ectoderm

Pseudocoelomate

Digestion

100

These phylums are the only 2 that undergo incomplete digestion

Cnidaria and Platyhelminthes

200

This phylum undergoes cell by cell digestion

Porifera

300

These 2 phylums are the only deuterostomes

Chordata and echinodermata

400

This phylum is a filter feeder

Echinodermata

500

These 4 phylums are protostomes

Arthropoda, nematoda, annelida, mollusca

Symmetry

100

The only phylum that is asymmetrical

Porifera

200

The only 2 phylums with radial symmetry as adults (an in general)

Cnidaria and echinodermata

300

This type of symmetry has one line of symmtery

Bilateral

400

This type of symmetry has multiple lines of symmetry

Radial

500

This type of symmetry can result in cephalization

Bilateral

Cnidaria 1

100

This class refers to jellyfish

Scyphozoa

200

This class refers to anemones and corals

Anthozoa

300

The names given for stationary and movement forms

Polyp and medusa

400

Cells that eject stinging organelles are called this

Cnidocytes

500

Organelles that trigger stinging are called this

Nematocysts

Cnidaria 2

100

This class only has a polyp form

Anthozoa

200

This class has a polyp and medusa form

Scyphozoa

300

Jellyfish use stinging for this purpose

Defense

400

This form of class scyphozoa has radial symmetry

Medusa

500

This form of class scyphozoa has no symmetry

Polyp