invertebrata asli
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Cnidaria(With Ctenophora)
Katy Shin and
Annmarie Mendoza
http://cache.gawker.com/assets/images/io9/2009/06/85743010_91324c4104_o.jpg
Scyphozoa Rhizostomae - Ctenophora
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Body Plan
Polyp: mouth-up;
sessile
Medusa: mouth-down;
free-moving (drifting
and contractions)
Body plan can be life-
long, or have both
plans in two stages of
development.
http://biology.unm.edu/ccouncil/Biology_203/Images/SimpleAnimals/cnidariaDiagram.jpegAnnmarie Mendoza
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Phylum: Ctenophora
Comb Jellies
Two Classes: Class Tentaculata: Two tentacles.
Class Nuda: No tentacles.
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Tentaculata Lobata - Ctenophora
Lobate Comb Jelly
http://upload.wikimedia.org/wikipedia/commons/2/21/Bathocyroe_fosteri.jpgAnnmarie Mendoza
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Phylum: Cnidaria
Jellies, Hydras, Corals.
Four Classes: Hydrozoa, Scyphozoa, Cubozoa, Anthozoa
Please note that Cnidarians lack:
Circulatory System
Excretory System
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Chrysaora colorata - Scyphozoans
Purple-striped Jelly Fish
http://www.flickr.com/photos/lemurdillo/3247600125/Katy Shin
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Physalia physalis- Hydrozoans
Portuguese Man o War
http://en.wikipedia.org/wiki/File:Portuguese_Man-O-War_%28Physalia_physalis%29.jpgKaty Shin
http://en.wikipedia.org/wiki/File:Portuguese_Man-O-War_%28Physalia_physalis%29.jpghttp://en.wikipedia.org/wiki/File:Portuguese_Man-O-War_%28Physalia_physalis%29.jpghttp://en.wikipedia.org/wiki/File:Portuguese_Man-O-War_%28Physalia_physalis%29.jpghttp://en.wikipedia.org/wiki/File:Portuguese_Man-O-War_%28Physalia_physalis%29.jpghttp://en.wikipedia.org/wiki/File:Portuguese_Man-O-War_%28Physalia_physalis%29.jpghttp://en.wikipedia.org/wiki/File:Portuguese_Man-O-War_%28Physalia_physalis%29.jpg -
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Diploria labyrinthiformis -Anthozoans
Brain Coral
http://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlAnnmarie Mendoza
http://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlhttp://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlhttp://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlhttp://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlhttp://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlhttp://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlhttp://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlhttp://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.html -
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Body Cavity
Diploblastic: two germ layers.
Ectoderm and Endoderm Some can be considered triploblastic.
Less-developed mesoderm
Overall, lack body cavity.
Gastrovascular cavity: site of digestion.
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Body Symmetry
Cnidarians have radial symmetry.
Radial Symmetry- They radiate from thecenter and if divided through the central axis
it will be symmetrical. It does not have a
head or rear or left or right.
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Digestion
1) Tentacles take in prey. Enters through the
mouth.2) Prey enters the gastrovascular cavity.
3) Nutrients stored in food vacuoles in
gastrodermal cells.
4) Undigested remains pushed out through
anus.
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Locomotion/Musculature
Cnidarians use tentacles for locomotion andalso for feeding and defense.
Their tentacles are equipped with cnidocytes,which are unique cells that function indefense and capture of prey. It injects poisoninto the prey.
Some forms of Cnidaria are positionedpermanently on the ground while some floataround using their tentacles.
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Skeletal System
Has hydrostatic "skeleton" some with
external or internal skeletons of calciumcarbonate or organic material.
Meslogea is the endoskeleton while chitin is
their exoskeleton.
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Sensory/Nervous Features
Cnidaria has a very simple nervous system,they have what is known as a nerve net.
These nerves are mostly in epidermisconnected to the gastrodermis.
Their nerve net is not centralized and is only
associated with simple sensory structures. Because it is not centralized they can detect
and respond to a stimuli equally from alldirections.
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Reproduction
Has both asexual and sexual reproduction,but does not undergo alternation of
generations. The polyp stage is asexual and the medusa
sage is sexual.
These two stages alternate and one
produces the other.
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Reproduction (cont.)
http://bio1151b.nicerweb.net/Locked/media/ch33/33_08ObeliaLifeCycle.jpg Katy Shin
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Gas Exchange
Cnidarians do not have/need a respiratory
system. Their skin is thin enough to diffuse in and out
of the body.
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Quiz Question #1
What is the type of body cavity of Cnidarians?
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Quiz Question #1 Answer
Cnidarians are diploblastic. They cannot have a
body cavity because they do not have amesoderm.
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Quiz Question #2
Cnidarians come in two body plans. What are
they and how are they different?
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Quiz Question #2 Answer
Cnidarians can either be in polyp form or
medusa form.Polyps are sessile, with their tentacles and
mouth/anus pointing upwards.
Medusa are free-moving, with their tentacles
and mouth/anus pointing downward.
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Quiz Question #3
Why dont Cnidarians need a respiratory
system?
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Quiz Question #3 Answer
Their skin is thin enough to diffuse gases in
and out of the body.
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Quiz Question #4
What systems are Cnidarians lacking?
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Quiz Question #4 Answer
They lack both the Circulatory System and the
Excretory System.
Katy Shin