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Cnidaria Ctenophora


Charles Lowery

on 7 February 2011

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Transcript of Cnidaria Ctenophora

Cnidarians Ctenophores "comb-bearers" "needle-bearers" Taxa Morphology and
general Characteristics Morphology Class Anthozoa
Anemones And Corals Class Hydrozoa
Hydras Class Scyphozoa
True Jellyfish Class Tentaculata
(has tentacles) Class Nuda
(no tentacles) Largest Group of ctenophores Non-ciliated
Have "macrocilia" on inside of body
Main diet = other ctenophores Have Tentacles that are used in feeding
Tentacles have structure alot like a cnidocytes in cnidarians Tentilla (fancy word for tentacle) Look alot like cnidocytes with one huge difference
instead of making and delivering venom, these "colloblasts"
make mucos that sticks to prey. Once stuck, the tentacles are retracted to the pharynx where the prey is digested. Bioluminescence
Used as a way to attract prey
Plankton swim towards the shiney
ctenophores, by the time they realize
what it is, it is too late Exhibit biradial symmetry
2 planes of symmetry
-pharyngeal plane
-tentacular plane Locomotion - no muscles or muscle movement
travel by means of cilia, the rows of cilia are fused together
and are known as ctenes, or combs Class Cubozoa
Box Jellies http://video.google.com/videoplay?docid=2629596391787161776&ei=ucFpS_7MHIiOrQLT1IWCDw&q=bioluminescent&hl=en&view=3#docid=2975129723668845042 Predation by ctenophores keeps the populations of
zoplankton in check, if not the zoplankton would
wipe out the phytoplankton and destroy the food web in the ocean Polymorphism - many different
body forms, in cnidarians there are
two main adult body body forms 1. Medusa 2. Polyp Cnidocytes/nematocysts - stinging cells on
tentacles that deliver venom These cells are so specialized they require special support cells for nutrition and for the firing mechanism. Steps for firing
1. The cilia is stimulated

2. Support cells flood
cnidocytes with ions, causing a
huge [] difference

3. Water can not be held
out of cell and rushes in, creating
a difference in pressure of
140 atm

4. Cnidocyte opens, releasing
tubule at an intense rate(fastest thing in nature)

5. Full expansion of the cnidocytes occures in 0.2 seconds Only Polyps Only Medusas Both Body Forms Life Cycle Guide 1-3 : Larva look for a good settling spot 4-8 : Polyp matures and grows

9-11 : Polyp STROBILATES

12-14 : Medusa Grows and starts process all over again Polyp - asexual reproduction (budding)

Medusa - sexual reproduction
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