Costa Rica Spider
January 30, 2010
This spider was found in a cabin in the jungle in the southeastern corner of Costa Rica, near Puerto Viejo de Talamanca. S/he appeared in the evening around 7 pm, and was just sitting on the wall when I turned on the light. When I used the glass and paper method to move her, I noticed s/he moved kind of like a crab: sideways rather than forwards. S/he was fearful rather than aggressive in response to my trapping efforts. For scale, I left the white light switch panel in the photo, which was probably 5 or 5 1/2″ across. I have never seen anything like this spider and I have been unable to figure out what it might be based on anything I’ve seen online. I later asked a local about the photo and I was told that these spiders are seen when trees are cut down. I would appreciate any information you can share that might help me identify this spider.
Anne Bunner
Costa Rica

Tailless Whipscorpion

Hi Anne,
Though it is an Arachnid, your Tailless Whipscorpion is neither a spider nor a scorpion.  Tailless Whipscorpions, despite having a frightening appearance, are perfectly harmless since they have no venom.  They are shy nocturnal hunters that prey upon cockroaches and other night crawlers.

Leave a Reply

Your email address will not be published.