Cnidarians & Ctenophorans - Warren Aquatics

Cnidarians & Ctenophorans Phylum Cnidaria Most are marine (jellyfish, coral, sea anemones, Portuguese man-of war, hydras)

Note:Hydras are found in freshwater Cnidarian Characteristics Radial symmetry

Have a single opening (serves as both mouth and anus) Tentacles Carnivores! Nickname: Flowers of the Animal Kingdom

Cnidarian Characteristics Either tubular or bell shaped Tentacles Only animal with cnidocytes (stinging

cells) and Nematocysts coiled, harpoon-like stinger inside that shoots out Cnidocyte Coiled

nematocyst Nematocyst Barbed, threade d stinger

capsules lid trigger nematocyst Cnidarians Cnidarians

are two types: 1) Polyps (stationary) 2) Medusas (free swimming)

Two Main Body Plans of Cnidarians UPRIGHT TENTACLES TENTACLES HANG DOWN epidermi

s mouth Polyp mesoglea Medusa

Mesoglea THICK gastrodermi s Mesoglea THIN Cnidarian Diversity

Scyphozoans: Jellyfish Anthozoans: Sea anemones Corals Hydrozoans: Hydra Cubozoa

Box Jellies Cnidarian Diversity Coral polyps Sea Anemone Jellyfish

Coral polyps Anthozoa ns Anthozoan Characteristics

Sea Anemones Brightly colored & Resemble flowers Solitary polyps Feed on invertebrates & fish

Corals Most are colonial Build limestone case Live as polyps in their case Sea

Anemones & Coral Corals build a limestone

case which build up & form coral reefs ANEMON E

CORAL Distribution of Coral Reefs Hydrozoa ns

Hydrozoans Hydra Exist only as polyps Reproduce by

budding Freshwater only Hydra Hydra

Feeding Food in Gastrovascula r Cavity Scyphozoan Characteristics

Jellyfish Medusa is the body form Stinging tentacles

Parts of a Jellyfish Some Jellyfish Show Luminescence Ctenophoran

Characteristics Called comb jellies All marine Bioluminescent Ctenophore

27

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