1 The Characteristics of Phylum Cnidaria The Characteristics of Phylum Cnidaria Characteristics of Phylum Cnidaria Characteristics of Phylum Cnidaria • radial symmetry • blind sac gut (= coelenteron or gastrovascular cavity) • diploblastic with mesoglea • polyp and medusa body forms • nematocysts (= specialized stinging capsules) • nerve net • lack excretory, circulatory & respiratory systems • complex life cycle • many colonial forms exhibiting polymorphism • radial symmetry • blind sac gut (= coelenteron or gastrovascular cavity) • diploblastic with mesoglea • polyp and medusa body forms • nematocysts (= specialized stinging capsules) • nerve net • lack excretory, circulatory & respiratory systems • complex life cycle • many colonial forms exhibiting polymorphism Radial Symmetry Radial Symmetry aboral aboral oral oral Bilateral Symmetry Bilateral Symmetry Blind Sac Gut Blind Sac Gut Complete Gut Complete Gut
4
Embed
The Characteristics of Characteristics of Phylum Phylum ...krupp.wcc.hawaii.edu/BIOL200/powerpnt/pdffiles/cnidarchar.pdf · 1 The Characteristics of Phylum Cnidaria Characteristics
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
The Characteristics ofPhylum Cnidaria
The Characteristics ofPhylum Cnidaria
Characteristics of PhylumCnidariaCharacteristics of PhylumCnidaria
• radial symmetry• blind sac gut (= coelenteron or gastrovascular
cavity)• diploblastic with mesoglea• polyp and medusa body forms• nematocysts (= specialized stinging capsules)• nerve net• lack excretory, circulatory & respiratory systems• complex life cycle• many colonial forms exhibiting polymorphism
• radial symmetry• blind sac gut (= coelenteron or gastrovascular
cavity)• diploblastic with mesoglea• polyp and medusa body forms• nematocysts (= specialized stinging capsules)• nerve net• lack excretory, circulatory & respiratory systems• complex life cycle• many colonial forms exhibiting polymorphism
Radial SymmetryRadial Symmetry
aboralaboral
oraloral
Bilateral SymmetryBilateral Symmetry
From The World Book (TM) Multimedia Encyclopedia (c) 1999 World Book, Inc., 525 W. Monroe, Chicago, IL 60661. All rights reserved. !"Charles W. Mann, National Audubon Society from Photo Researchers!
From The World Book (TM) Multimedia Encyclopedia (c) 1999 World Book, Inc., 525 W. Monroe, Chicago, IL 60661. All rights reserved. !"Charles W. Mann, National Audubon Society from Photo Researchers!
From The World Book (TM) Multimedia Encyclopedia (c) 1999 World Book, Inc., 525 W. Monroe, Chicago, IL 60661. All rights reserved. !"World Book illustration by James Teason!
From The World Book (TM) Multimedia Encyclopedia (c) 1999 World Book, Inc., 525 W. Monroe, Chicago, IL 60661. All rights reserved. !"World Book illustration by James Teason!
Blind Sac GutBlind Sac Gut Complete GutComplete Gut
2
DiploblasticDiploblastic
gutgut
ectodermectoderm
endodermendoderm mesogleamesoglea
DiploblasticDiploblastic
(from the endoderm)
(from the ectoderm)
TriploblasticTriploblastic Polyp and Medusa Body FormsPolyp and Medusa Body Forms
polyppolypmedusamedusa
POLYP ANATOMY
EPIDERMIS
MESOGLEA
MOUTH
GUT
GASTRODERMIS
TENTACLE
COLUMN
ABORAL
ORALMedusa Body FormMedusa Body Form
3
NematocystsNematocysts NematocystNematocyst
NematocystsNematocysts Nerve NetNerve Net
Diffusion Across the BodyWallDiffusion Across the BodyWall
Sea AnemonesSea Anemones
4
Circulation in a Moon JellyfishCirculation in a Moon Jellyfish The Cnidarian Life CycleThe Cnidarian Life Cycle
TheCnidarianLife Cycle
TheCnidarianLife Cycle
ColonialityColoniality
From The World Book (TM) Multimedia Encyclopedia (c) 1999 World Book, Inc., 525 W. Monroe, Chicago, IL 60661. All rights reserved. !"(c) Maira & Rod Borland, Bruce Coleman, Inc. !
From The World Book (TM) Multimedia Encyclopedia (c) 1999 World Book, Inc., 525 W. Monroe, Chicago, IL 60661. All rights reserved. !"(c) Maira & Rod Borland, Bruce Coleman, Inc. !