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Date Submitted: 06/01/2008 08:42 PM
There are 9 Organisms in Nine Different Phyla.
Organism Phyla Dichotomous Key (steps) Classification
1 CNIDARIA Symmetry is radial or bilateral
Radial symmetry; lacks a well defined head
No spines or arms present
Saucer-shaped, transparent body with tentacles, free floating Class Scyphozoa
2 MOLLUSCA Symmetry is radial or bilateral
Bilateral symmetry (similar right and left body halves; anterior head end and posterior tail end)
Animal has no apparent skeleton, or may have an exoskeleton (hard outer covering), or may have a shell (invertebrate)
Hard outer covering, exoskeleton, or shell; not worm-like
No jointed appendages
Soft body, obvious head
May or may not have a shell; head with tentacles, small eye or eye spot Class Gastropoda
3 ANNELIDA Symmetry is radial or bilateral
Bilateral symmetry (similar right and left body halves; anterior head end and posterior tail end)
Animal has no apparent skeleton, or may have an exoskeleton (hard outer covering), or may have a shell (invertebrate)
No hard outer covering, exoskeleton, or shell; worm-like
Body is segmented ANNELIDA
4 ARTHROPODA Symmetry is radial or bilateral
Bilateral symmetry (similar right and left body halves; anterior head end and posterior tail end)
Animal has no apparent skeleton, or may have an exoskeleton (hard outer covering), or may have a shell (invertebrate)
Hard outer covering, exoskeleton, or shell; not worm-like
Jointed appendages
One pair of antennae or none, no large claws
Three pairs of legs; wings present Class Insecta
5 PORIFERA Symmetry is irregular (neither bilateral or radial); aquatic; body structure without tissues or organs PORIFERA
Echinodermata Symmetry is radial or bilateral
Radial symmetry; lacks a well defined head
Spines or arms present
Five arms present, body surface knobby Class Asteroidea
7 CHORDATA Symmetry is radial or bilateral
Bilateral symmetry (similar right and left body halves; anterior head end and...