By: Kaden C. Jacqueline M. Cnidarians By: Kaden C. Jacqueline M.

Phylum: Cnidaria Example: phylum under Kingdom Animalia over 11,000 species aquatic environments: they are predominantly marine.  Jellyfishes Sea Fans Sea anemones Hydras Coral

Body Symmetry and Body Plan Depending on the type they could have a bilateral, radial, or no symmetry.

Cnidaria feeding Some are filter feeders Uses Tentacle Cnidocytes Nematocysts by injecting poison cells into prey prey such as crustaceans and fish pass by and touch their tentacles.  they poison them and draw them toward their mouths to be digested. Predation, or carnivore is the prey on another animal.

Circulation Diffusion From water to cells Cells back to water

Cnidaria Excretion  individual cells carrying the waste back into the water. Diffusion 

Cnidaria Response nerve nets with specialized cells called Cnidocytes  poison prey and cause a jellyfish sting.

Movement Some don’t move Other use weak muscles to somersault Polyp - like a sea anemone with a columnar body with the mouth uppermost surrounded by a ring of tentacles. - stationary Medusa - free-swimming sexual form of a coelenterate such as a jellyfish, typically having an umbrella- shaped body with stinging tentacles around the edge.

Reproduction Both asexually and sexually Males release sperm into the water  Females absorb it Reproduction

Respiration Diffusion Individual cells obtain oxygen directly from water

Examples Polyp like a sea Anemone  Medusa like a jellyfish