Branch of biology dealing with animals having no backbones or spinal columns.
Apoidea -- Bees and Sphecid Wasps [ More info] Guide to the identification, biology, and ecology of bees and sphecid wasps, mostly in eastern North America.
Butterflies and moths of North America [ More info] Information on species of butterflies in North America with photos, checklists, distribution maps, aids to identification, and references.
Dragonflies and damselflies (Odonata) of the United States [ More info] Manual on dragonflies and damselflies (Odonata), with links to photo thumbnails, checklists, distribution maps, and other Odonata information.
Earthworms of North Dakota [ More info] Species maps, aggregate map, earthworm diagram, species photos, and bibliography of earthworm species found in North Dakota
Invasive crayfish in the Pacific Northwest [ More info] These organisms have negative effects on local ecosystems, but we don't yet know how extensively they have spread. Here is a key to help people identify them.
Mayflies of the United States [ More info] Links to checklists and species maps showing the distribution of mayflies in the United States with links to other information websites on mayflies and reference list.
Red-Rimmed Melania (Melanoides tuberculatus) - A Snail in Biscayne National Park, Florida - Harmful Invader or Just a Nuisance? [ More info] Explains how this potentially harmful invasive species arrived, why we are concerned, where in the area it is found, what environmental factors control its spread, and what might be done in response.
Southwest Caves Reveal New Forms of Life [ More info] These lightless and nutrient-poor natural systems are home to life forms found nowhere else on Earth. Three new genera and at least 15 new species have been discovered here.
Stoneflies of the United States [ More info] Links to checklists and species maps showing the distribution of stoneflies in the United States with links to other information websites on stoneflies and reference list.
The Palmyra Atoll Research Consortium [ More info] Palmyra Atoll in the tropical Pacific is a "living laboratory" for multi-disciplinary research on coral reef ecosystems, insular terrestrial ecosystems, climate change, and the lingering effects of Cold War nuclear testing.
Tiger beetles of the United States [ More info] Links to checklists and species maps showing the distribution of tiger beetles in the United States with links to photographs, other information websites on invertebrates, and reference list.
Alphabetical Index of Topics
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