Biology - M. Murphy
Lab: Vertebrates
Dichotomous Key for Vertebrates:

1a. Animal is not a vertebrate ............................................................................... go to 2
1b. Animal is a vertebrate ..................................................................................... go to 3

2a. Animal has a protein-carbohydrate exoskeleton .............................................
Tunicata
2b. Animal does not have an exoskeleton ............................................................ Cephalochordata

3a. Animal reproduces using shelled amniote eggs ............................................. go to 4
3b. Animal does not use shelled amniote eggs in reproduction ........................... go to 5

4a. Animal is an ectotherm ...................................................................................
Reptilia
4b. Animal is an endotherm .................................................................................. Aves

5a. Animal reproduces by placental live birth ....................................................... go to 6
5b. Animal reproduces by spawning ..................................................................... go to 7

6a. Animal is an ectotherm ...................................................................................
Chondrichthyes
6b. Animal is an endotherm .................................................................................. Mammalia

7a. Animal has a cartilage skeleton ...................................................................... Agnathan
7b. Animal has a bony skeleton ............................................................................ go to 8

8a. Animal is a tetrapod ........................................................................................
Amphibia
8b. Animal is not a tetrapod .................................................................................. Osteichthyes
Next, Use the key below to identify the vertebrate classification of the organism
shown.  

Remember, always start with step one for each new organism.
Correct!  Sea Squirts are Tunicata.

Before moving on, watch the following video and answer the question(s).  
Each organism in this lab will have a video to watch and at least one question to
answer.  Type your question answers in a Word document for upload to the lab
dropox.

Sea Squirt video:
https://www.youtube.com/watch?v=2wJP_iB1hyc

Sea Squirt question:
1. Describe how tunicate hearts are unique.