ClassificationCreate a Decision Tree and

Dichotomous Key

Classification

 So far in class we have practiced classifying various things.  First we used a decision tree to separate things using their traits or characteristics. Then we used the decision tree, to create a dichotomous key.

Your Task: Part 1

1. Study the pictures of the     macroinvertebrates on the following     slides.2. Note characteristics like: number of legs,    number of "toes", gills, tails, "eyes",     head, "fan-like" body parts.3. Do not use characteristics like color or     size.  They're just not reliable.

Your Task: Part 2

1.Create a decision tree.  Be very specific

     when labeling characteristics.2.  Create a dichotomous key using your      decision tree.

Stonefly Larva

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

Alderfly Larva

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

Caddisfly Larva (non-case builder)

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

Dragonfly Larva

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

Cranefly Larva

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?

 

Blackfly Larva

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

Mayfly Larva

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

Caddisfly Larva (case builder)

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

Riffle Beetle Adult

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?

 

 

•number of legs?•number of

"toes"?•number of tails?•gills?•well developed

head?•"fan-like" body

parts?