Phylum Cnidaria - Coelenterata (Cnido = nettle). Jellyfish - not real fish.
-
Upload
kiera-peard -
Category
Documents
-
view
235 -
download
6
Transcript of Phylum Cnidaria - Coelenterata (Cnido = nettle). Jellyfish - not real fish.
Phylum Cnidaria - Coelenterata(Cnido = nettle)
Jellyfish - not real fish
Blind sac- a bag with only one opening
Diploblastic -~epidermis functions in
protection, mucus, flagella and nematosystssensory receptionfood capturerespirationexcretion
~mesoglea functions inbody supportcements epithelianerve and muscle pathwaysdiffusion pathway
~endoderm = gastrodermis functions indigestionenzyme secretionfood uptakerespirationexcretion
Everting intracellular organelles (cnidae)~nematosysts = stining capsules
small hypodermic syringesvenom
neurotoxic (nerves)myotoxic (muscles)hemolytic (destroys RBC’s)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 dwellinganemones
nematocyst
Digestion is extracellular and intracellular
Skeletonhydrostatic- fluid filled, muscels operate against an
incompressable fluid
hard skeleton as with corals
Reproduction - ~metagenesis---alternation of generations
polyp or polyp colony = asexual stagemedusa = sexual stage
~Larva = planula~dioecious or monoecious
Classsification~class hydrozoa (hydra, hydroids, siphonophores, hydrocorals)
no mesentaries or septa in coelentrongastrodermis lacks nematocystshydromedusae have velum = a small shelf of tissue projecting
in from bell marginstructure
perisarc=non-living outer protective sheathcoenosarc=living tissue of hydrozoan within perisarchydrocaulus=stalk of colonythecate - where the stalk and polyps surrounded by
perisarchydrothecate=feeding polypgonotheca = reproductive polyp
athecate- only stalk surrounded by perisarc
Hydromedusae - free living, ‘pelagic’
Gonads visible
Aequoria
Hydra-common freshwater form
Hydra, budding
Obelia-thecate marine hydroid
Hydractinia symbiotic, athecate marine hydroid
Pagurus
Velella velella - by the wind sailor
Fire coral
hydrocoral
Physalia - Portugese man of war
~class Scyphozoa--true jellyfishTetramerous - 4 parterNo velumGastrovascular cavity
gastric pouchesgastric filimentsgastrodermal nematocysts
ManubriumRhopalium = sensory organs
statocystchemosensory pitsocellus
Most dioeceous - planula
Diversity
cassiopea
Chrysaora
Aurelia - moon jelly
Pelagia
~Class cubozoa - box jellies
Chironex = sea wasp
~Class Anthozoa- anemones, true corals, sea fans, sea pens, soft corals anemones, zoanthids
General characteristics-radial symmetrynematocysts
1. Tentacles2. Pharynx3. Siphonoglyph4. Gastrovascular cavity5. Primary septum6. secondary septum7.tertiary septum8. Acontia- nematocysts9. Pedal disc
Mouth K.O.D.
Aggregating anemone - Anthopleura elegantissima
A. xanthogrammica. in the surf zone
A. xanthogrammica…closed with sand
Malu-movement
Hermassinda crasicornis and red anemones
Clown fish
Octocorals - 8 parter radial symmetry-skeleton-colonial
Soft corals
Sea pen
Sea fan-
Also sea pansies, sea whils
Anthozoans- prostaglandins painkillers coral skeleton used in human bone
repair