TechnicalitiesTechnicalities

• Two variations on body plan:• Cnidaria?• Radial symmetry• DiploblasticDiploblastic

– No true body cavityNo true body cavity– Embryo has only ectoderm and endodermEmbryo has only ectoderm and endoderm

• Central gastrovascular cavityCentral gastrovascular cavity• Cnidae (Nematocysts)Cnidae (Nematocysts)

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Sometimes referred to as Sometimes referred to as Coelenterata, phylum Cnidaria Coelenterata, phylum Cnidaria consists of aquatic, invertebrate consists of aquatic, invertebrate animals. Characteristic of animals animals. Characteristic of animals within this phylum are radial within this phylum are radial symmetry, a gastrovascular cavity, symmetry, a gastrovascular cavity, and cnidae (capsule-like organelles and cnidae (capsule-like organelles capable of everting). Cnidaria may capable of everting). Cnidaria may be broken up into four classes: be broken up into four classes:

AnthozoaAnthozoa

coral

Sea pen

Anemone

HydrozoaHydrozoa

ScyphozoScyphozoa a CubozoaCubozoa

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NematocystNematocyst

ReferencesReferences• ““Cnidaria.” Cnidaria.” Wikipedia. Wikipedia. 2008. Wikimedia Foundation, Inc. 4 2008. Wikimedia Foundation, Inc. 4

February 2008 <http://en.wikipedia.org/wiki/Cnidaria>.February 2008 <http://en.wikipedia.org/wiki/Cnidaria>.• Collins, Allen. “Introduction to Cnidaria.” Collins, Allen. “Introduction to Cnidaria.” University of California University of California

Museum of Paleontology. Museum of Paleontology. 2006. UCMP. 4 February 2008 2006. UCMP. 4 February 2008 <http://www.ucmp.berkeley.edu/cnidaria/cnidaria.html>.<http://www.ucmp.berkeley.edu/cnidaria/cnidaria.html>.

• Macer, Darryl. “Bioethics Dictionary.” Macer, Darryl. “Bioethics Dictionary.” Eubios Ethics Institute.Eubios Ethics Institute. 2008. Eubios Ethics Institute. 4 February 2008 2008. Eubios Ethics Institute. 4 February 2008 <http://www.eubios.info/biodict.htm>.<http://www.eubios.info/biodict.htm>.

• ““Sea Pen.” Sea Pen.” Wikipedia. Wikipedia. 2007. Wikimedia Foundation, Inc. 4 2007. Wikimedia Foundation, Inc. 4 February 2008 <http://en.wikipedia.org/wiki/Sea_pen>.February 2008 <http://en.wikipedia.org/wiki/Sea_pen>.

• Campbell, Neil. “Invertebrates.” Campbell, Neil. “Invertebrates.” Biology. Biology. Seventh Edition. Ed. Seventh Edition. Ed. Beth Wilbur. San Francisco: Pearson Education, 2005. 643-645.Beth Wilbur. San Francisco: Pearson Education, 2005. 643-645.

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