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Phylum Cnidaria All contain nematocysts- stinging structures.

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Presentation on theme: "Phylum Cnidaria All contain nematocysts- stinging structures."— Presentation transcript:

1 Phylum Cnidaria All contain nematocysts- stinging structures

2 Cnidarians Jellies, Anemones, Corals Jellies, Anemones, Corals Dimorphism: Two body shapes during life cycle. (Polyp & Medusa) Dimorphism: Two body shapes during life cycle. (Polyp & Medusa) Gastrovascular cavity (digestive) Gastrovascular cavity (digestive) Carnivores Carnivores Primitive nerve net Primitive nerve net Two distinct tissue layers: Epidermis & Gastrodermis Two distinct tissue layers: Epidermis & Gastrodermis Cnidocyte (Stinging cells) in tentacles Cnidocyte (Stinging cells) in tentacles Radial Symmetry Radial Symmetry

3 Epidermis Mesoglea Gastroderm Mesoglea Gastrovascular cavity Mouth/anus Tentacles Mouth/anus Gastrovascular cavity PolypMedusa The Polyp and Medusa Stages

4 Feeding Paralyze prey and pulls into mouth gastrovascular cavity Paralyze prey and pulls into mouth gastrovascular cavity Undigested materials passed out through mouth/anus Undigested materials passed out through mouth/anus

5 Respiration, Circulation, Excretion Diffusion through body walls Diffusion through body walls Nerve net-network of nerve cells to detect stimuli Nerve net-network of nerve cells to detect stimuli Statocysts to determine gravity direction Statocysts to determine gravity direction Ocelli as eyespots to detect light Ocelli as eyespots to detect light Response

6 Movement Hydrostatic skeleton-muscles w/ water enable movement Hydrostatic skeleton-muscles w/ water enable movement Body contracts to force water out, moving jellyfish in opposite direction.

7 Reproduction and Life cycle Most cnidarians reproduce both sexually and asexually. Most cnidarians reproduce both sexually and asexually. External fertilization External fertilization

8 Fertilization occurs in the open water, producing many diploid zygotes. Sperm (N) Egg (N) Haploid Diploid FERTILIZATION MEIOSIS Male medusa (2N) Zygote (2N) Polyp Budding polyp Young medusa Female medusa (2N) Each zygote grows into a ciliated larva. The larva eventually attaches to a hard surface and develops into a polyp. Swimming larva The polyp buds to release young medusas. Adult medusas reproduce sexually by releasing gametes into the water. Jellyfish Life Cycle

9 Classes of Cnidaria Hydrozoa (Serpent Animals) Hydrozoa (Serpent Animals) Scyphozoa (Cup Animals) Scyphozoa (Cup Animals) Anthozoa (Flower Animals) Anthozoa (Flower Animals)

10 Class Hydrozoa Both body forms: polyp and medusa Both body forms: polyp and medusa Reproduce sexually as medusas. Reproduce sexually as medusas. Example: Portuguese Man Of War Example: Portuguese Man Of War

11 Class Scyphozoa True jellies True jellies Medusa form during most of its life cycle. Medusa form during most of its life cycle. Lions Mane is the most common in L.I.S. Lions Mane is the most common in L.I.S. Butter fish lives in its tentacles. Butter fish lives in its tentacles.

12 Moon Jelly Free swimming Free swimming Up to 30 cm wide Up to 30 cm wide Found in intertidal zone Found in intertidal zone Found in L.I.S. (Also in the tanks of Maritime Aquarium) Found in L.I.S. (Also in the tanks of Maritime Aquarium)

13 Sea Wasp (another scyphozoan ex.) Sea Wasp (another scyphozoan ex.) Known as box jellyfish Known as box jellyfish Most powerful venom in the world Most powerful venom in the world Lives in Australia Lives in Australia Can be up to 60 meters in length Can be up to 60 meters in length

14 Class Anthozoa They are individual or colonies of polyps found in coastal waters. They are individual or colonies of polyps found in coastal waters. No medusa stage. No medusa stage. Examples: Sea anemones,Hard corals, sea fans Examples: Sea anemones,Hard corals, sea fans

15 Northern Red Anemone 7.5 cm high, 12.5 cm wide 7.5 cm high, 12.5 cm wide Attach to rocks under rockweed. Attach to rocks under rockweed. Found in subtidal zones Found in subtidal zones

16 Striped Anemone 2 cm high.5 cm wide 2 cm high.5 cm wide Found on lower rocks on sheltered shores. Found on lower rocks on sheltered shores. Can tolerate reduced salinity. Can tolerate reduced salinity.

17 Sea fans

18 Hard corals

19 Phylum Ctenophora Ctenophores Ctenophores Common name: Comb jellies Common name: Comb jellies Contain eight rows of comb plates made of cilia used for locomotion (ciliary combs) Contain eight rows of comb plates made of cilia used for locomotion (ciliary combs) Bioluminescent Bioluminescent No stinging cells No stinging cells They feed on plankton They feed on plankton

20 Comb Jellies


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