Phylum Cnidaria - Coelenterata

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Phylum Cnidaria - Coelenterata (Cnido nettle)
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Jellyfish - not real fish
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Blind sac- a bag with only one opening Diploblast
ic - epidermis functions in protection, mucus,
flagella and nematosysts sensory reception food
capture respiration excretion mesoglea
functions in body support cements
epithelia nerve and muscle pathways diffusion
pathway
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endoderm gastrodermis functions
in digestion enzyme secretion food
uptake respiration excretion
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Everting intracellular organelles
(cnidae) nematosysts stining capsules small
hypodermic syringes venom neurotoxic
(nerves) myotoxic (muscles) hemolytic
(destroys RBCs) necrotic (digests tissue) not
all of the 30 types inject venom spirocysts -
adhesive organslles anmones, corals and the
like ptychocysts - used in the construction of
tubes of tube dwelling anemones
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nematocyst
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Digestion is extracellular and
intracellular Skeleton hydrostatic- fluid
filled, muscels operate against an
incompressable fluid hard skeleton as with
corals Reproduction - metagenesis---alternation
of generations polyp or polyp colony asexual
stage medusa sexual stage
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Larva planula dioecious or monoecious
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Classsification class hydrozoa (hydra, hydroids,
siphonophores, hydrocorals) no mesentaries or
septa in coelentron gastrodermis lacks
nematocysts hydromedusae have velum a small
shelf of tissue projecting in from bell
margin structure perisarcnon-living outer
protective sheath coenosarcliving tissue of
hydrozoan within perisarc hydrocaulusstalk of
colony thecate - where the stalk and polyps
surrounded by perisarc hydrothecatefeeding
polyp gonotheca reproductive
polyp athecate- only stalk surrounded by
perisarc
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Hydromedusae - free living, pelagic
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Gonads visible
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Aequoria
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Hydra-common freshwater form
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Hydra, budding
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Obelia- thecate marine hydroid
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Hydractinia symbiotic, athecate marine
hydroid Pagurus
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Velella velella - by the wind sailor
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Fire coral
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hydrocoral
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Physalia - Portugese man of war
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class Scyphozoa--true jellyfish Tetramerous - 4
parter No velum Gastrovascular cavity gastric
pouches gastric filiments gastrodermal
nematocysts Manubrium Rhopalium sensory
organs statocyst chemosensory
pits ocellus Most dioeceous - planula Diversity
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cassiopea
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Chrysaora
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Aurelia - moon jelly
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Pelagia
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Class cubozoa - box jellies Chironex sea
wasp
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Class Anthozoa- anemones, true corals, sea fans,
sea pens, soft corals anemones,
zoanthids General characteristics- radial
symmetry nematocysts
1. Tentacles 2. Pharynx 3. Siphonoglyph 4.
Gastrovascular cavity 5. Primary septum 6.
secondary septum 7.tertiary septum 8. Acontia-
nematocysts 9. Pedal disc
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Mouth K.O.D.
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Aggregating anemone - Anthopleura elegantissima
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A. xanthogrammica. in the surf zone
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A. xanthogrammicaclosed with sand
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Malu-movement
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Hermassinda crasicornis and red anemones
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Clown fish
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Octocorals - 8 parter radial symmetry-skeleton-col
onial
Soft corals
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Sea pen
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Sea fan- Also sea pansies, sea
whils Anthozoans- prostaglandins painkillers
coral skeleton used in human bone repair