Links

Diversity/Evolution:
Tree of Life- This site showcases the planet's biodiversity and evolutionary history

Lepidoptera:
Moths of Southeastern Arizona- >1900 species compiled by Bruce Walsh
Butterflies of Southeastern Arizona- Butterfly companion site to above

Odonates:
Arizona Odonates- Info on distributions, flight dates, checklists, etc.
Odonates of the Southwest- A collection of odonate photos, and diagnostic descriptions of southwestern species.

Orthoptera:
Northern Arizona University Orthoptera collection photos
Orthoptera Species Files- Katydid database w/3800 species

Plants:
ASU Herbarium- Great resource for Arizona flora
CalPhotos: Plants

Other Arizona sites of interest:
Arizonensis.org- Natural history of Arizona