One of three methane-eating, deep-sea spider species recently discovered off the Southern California coast. Courtesy of Shana Goffredi By Erin Rode , Contributing LA Outdoors Editor June 16, 2025 ...

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There are a few other dangerous brown spiders to be aware of but most common brown spiders in California are harmless. The three dangerous ones are the Desert recluse, Chilean recluse and Brown Widow.

In fact, each of the three sea spider species collected for the study were from different areas off the coast of Southern California and Alaska — a clue that the populations are highly localized.