Phylum Cnidaria Marine Science Cnidarian Characteristics stinging cells

Cnidarian Characteristics -stinging cells ● Cnidocytes/nematocytes https: //www. youtube. com/watch? v=IJid. AI 1 WASo

A Closer Look at Cnidocytes Cnida/nematocyst: the stinging organelle of the cell. -found on

Phylum Cnidaria: Jellyfish Anemones Corals Hydroids

Class Hydrozoa (hydroids) -most are colonial organisms -some are sessile, some are planktonic. -some

Class Scyphozoa (jellyfish) -True jellyfish! -Mostly planktonic -Majority of their life is spent in

Class Cubozoa (box jellyfish) -predators, eat fish -strong swimmers -the bell is box shaped

Irukandji Box Jellyfish -2 cm diameter -Found in Australia -Believed to be the most

Class Anthozoa (sea anemones, true corals) -benthic -live their lives almost exclusively as polyps

Cool Videos! https: //www. youtube. com/watch? v=Nu. Ct 0 -m 3 VI 8 https:

Ecological Importance -predators -some fish, sea turtles and molluscs feed on cnidarians. -symbiotic relationships

Ecological Importance Formation of habitats ● coral polyps→ coral reefs → 3 -dimensional hard

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Phylum Cnidaria Marine Science

Cnidarian Characteristics -stinging cells ● Cnidocytes/nematocytes https: //www. youtube. com/watch? v=IJid. AI 1 WASo -radial symmetry -many are predators -have true tissues ● Mesoglea (the jelly)

A Closer Look at Cnidocytes Cnida/nematocyst: the stinging organelle of the cell. -found on tentacles 1. ) touch activated trigger 2. ) barb and coiled up thread eject 3. ) barbs and thread attach to prey’s flesh

Phylum Cnidaria: Jellyfish Anemones Corals Hydroids

Class Hydrozoa (hydroids) -most are colonial organisms -some are sessile, some are planktonic. -some secrete a Ca. CO 3 skeleton (fire coral). Hydra

Class Scyphozoa (jellyfish) -True jellyfish! -Mostly planktonic -Majority of their life is spent in the medusa stage. https: //www. youtube. com/watch? v=y. Qdu. Hyi. We 9 o Upside-down jellyfish: has symbiotic dinoflagellates within it’s body

Class Cubozoa (box jellyfish) -predators, eat fish -strong swimmers -the bell is box shaped -tropical organisms -EXTREMELY venomous

Irukandji Box Jellyfish -2 cm diameter -Found in Australia -Believed to be the most venomous organism in the world.

Class Anthozoa (sea anemones, true corals) -benthic -live their lives almost exclusively as polyps -they still have tentacles and nematocysts -many of them (corals) have symbiotic dinoflagellates (Symbiodinium) Need to stay in shallow waters -corals have a Ca. Co 3 skeleton and grow from 0. 5 to 2 cm a year!

Cool Videos! https: //www. youtube. com/watch? v=Nu. Ct 0 -m 3 VI 8 https: //www. youtube. com/watch? v=Lo. MEm. KNGNEg https: //www. youtube. com/watch? v=Bn 2 xk. IJhte 4 https: //www. youtube. com/watch? v=-6 l. MD 9 h_ix 4

Ecological Importance -predators -some fish, sea turtles and molluscs feed on cnidarians. -symbiotic relationships

Ecological Importance Formation of habitats ● coral polyps→ coral reefs → 3 -dimensional hard structures ● water ‘filtration’ (suspension-feeding) ● defense from wave action ● carbon sink (Ca. CO 3)