Create a dichotomous key using similarities and differences of particular features of these organisms. For the key to be useful, each set of branches should end in ONE species of organism.
Include all of the following:
North pine Freshwater Snail, Damselfly: Bronze Needle
Mayfly, Dragonfly: Conhead Darner
Damselfly: Golden Flatwing, Dragonfly: Black Tigertail
Stonefly, Green Diving Beetle
Toe-winged Beetle, Blackflies
1a. Organism has wings- Go to step 2
1b. Organism does not have wings- Go to step 3
2a. Wings are narrow and elongated- Go to Damselfly: Bronze Needle
2b. Wings are broader and shorter- Go to Mayfly, Dragonfly: Conhead Darner
3a. Organism has gills- Go to step 4
3b. Organism does not have gills- Go to step 7
4a. Gills are flat- Go to Damselfly: Golden Flatwing
4b. Gills are three-dimensional- Go to step 5
5a. Organism is small and slender with black and yellow markings- Go to Dragonfly: Black Tigertail
5b. Organism is not small and slender with black and yellow markings- Go to step 6
6a. Organism has a rounded body and legs adapted for clinging to rocks- Go to Stonefly
6b. Organism has an elongated body and flattened legs adapted for swimming- Go to Green Diving Beetle
7a. Organism has six legs and two wings, and is very small- Go to Blackflies
7b. Organism does not have six legs and two wings, and is not very small- Go to Toe-winged Beetle