Biology - M. Murphy
Lab: Invertebrates
Lab: Invertebrates
Use the key below to identify the invertebrate phylum of the organism shown.
Remember, always start with step one for each new organism.
If you did not yet complete the "Dichotomous Key: Protists" activity, do that
before this to ensure you are familiar with how to follow a dichotomous key.
Remember, always start with step one for each new organism.
If you did not yet complete the "Dichotomous Key: Protists" activity, do that
before this to ensure you are familiar with how to follow a dichotomous key.
Dichotomous Key for Invertebrates:
1a. Animal has no regular body symmetry ........................................................ Porifera
1b. Animal has regular body symmetry ............................................................. go to 2
2a. Animal has radial body symmetry ............................................................... go to 3
2b. Animal has bilateral symmetry .................................................................... go to 4
3a. Animal has an endoskeleton ...................................................................... Echinodermata
3b. Animal does not have an endoskeleton ..................................................... Cnidaria
4a. Animal has one digestive tube opening ...................................................... Platyhelminth
4b. Animal has two digestive tube openings ..................................................... go to 5
5a. Animal has a pseudocoelomate body plan ................................................. Nematoda
5b. Animal has a coelomate body plan ............................................................. go to 6
6a. Animal has a chitin exoskeleton and jointed appendages .......................... Arthropoda
6b. Animal does not have a chitin exoskeleton or jointed appendages ............ go to 7
7a. Animal body is formed by repeating ring segments .................................... Annelida
7b. Animal body is not formed by repeating ring segments .............................. Molluska
1a. Animal has no regular body symmetry ........................................................ Porifera
1b. Animal has regular body symmetry ............................................................. go to 2
2a. Animal has radial body symmetry ............................................................... go to 3
2b. Animal has bilateral symmetry .................................................................... go to 4
3a. Animal has an endoskeleton ...................................................................... Echinodermata
3b. Animal does not have an endoskeleton ..................................................... Cnidaria
4a. Animal has one digestive tube opening ...................................................... Platyhelminth
4b. Animal has two digestive tube openings ..................................................... go to 5
5a. Animal has a pseudocoelomate body plan ................................................. Nematoda
5b. Animal has a coelomate body plan ............................................................. go to 6
6a. Animal has a chitin exoskeleton and jointed appendages .......................... Arthropoda
6b. Animal does not have a chitin exoskeleton or jointed appendages ............ go to 7
7a. Animal body is formed by repeating ring segments .................................... Annelida
7b. Animal body is not formed by repeating ring segments .............................. Molluska
 |
 |