If you want to learn more about the insects and arachnids of our region, see our Reference section for species checklists, essays, books recommended by our staff, and other resources on our own site.
Some of the species in this list are rare or are limited in their distribution. Those that are rare and are likely to be seen in limited capacity are marked with an asterisk(*). Species indigenous to San Diego County are bolded.Species with state or federal protection are bolded orange. Learn more.
The following revised checklist, as probably with most regional checklists, is preliminary and hopefully will be useful for environmental management and planning as well as a starting point for further biological studies of the regional fauna. Citations refer to papers with descriptions, locality information, or nomenclatural notes. Learn more.
The following checklist is preliminary and hopefully will be useful for environmental management and planning as well as a starting point for further biological studies of the regional spider fauna. Citations refer to papers with locality information, descriptions, or nomenclatural notes. Learn more.
With over one million described species of insects and their relatives, it is impossible for one person to know them all. We use this blog to get our latest discoveries and poorly understood collections in front of the eyes of the internet! Create a login and you can use our image comment tool to add identification directly to images or add comments below each image. Learn more.
Researchers at the San Diego Natural History Museum, along with experts from Mexico and Brazil, have described a new species of large cave-dwelling spider, the Sierra Cacachilas wandering spider (Califorctenus cacachilensis). Related to the notoriously venomous Brazilian wandering spider (Phoneutria fera), the Sierra Cacachilas wandering spider was first discovered on a collaborative research expedition into a small mountain range outside of La Paz in Baja California Sur, Mexico. Read more.