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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.

Annmarie Mendoza

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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

Annmarie Mendoza

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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

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Diploria labyrinthiformis -Anthozoans

Brain Coral

http://fromaardvarkstozinc.blogspot.com/2009/01/biology-5-reef-animals_12.htmlAnnmarie Mendoza

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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.

Annmarie Mendoza

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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.

Katy Shin

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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.

Katy Shin

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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.

Katy Shin

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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.

Katy Shin

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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.

Katy Shin

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Quiz Question #1

What is the type of body cavity of Cnidarians?

Annmarie Mendoza

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Quiz Question #1 Answer

Cnidarians are diploblastic. They cannot have a

body cavity because they do not have amesoderm.

Annmarie Mendoza

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Quiz Question #2

Cnidarians come in two body plans. What are

they and how are they different?

Annmarie Mendoza

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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?

Katy Shin

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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