According to a blog post from the museum, in 2013 field entomologist Jim Berrian and a team of researchers found the spider while exploring the Sierra Cacachilas, a small mountain range in Baja California Sur in Mexico. Investigating a cave in the area, they noticed a giant exoskeleton hanging from the ceiling. Instead of running back to their hotel and hiding under the covers, they decided to return that night, since they identified the spider as belonging to a genus of arachnids that are often nocturnal. That night, in the darkened cave, the team got their first look at what is now known as Califorctenus cacachilensis, or the Sierra Cacachilas wandering spider. The official description of the new spider appears in the journal Zootaxa.
“When I saw these spiders for the first time, I was very impressed by their size,” Baja spider expert Maria Luisa Jimenez, a researcher at Centro de Investigaciones Biológicas del Noroeste, says in the blog post. “In all my experience over the years collecting spiders on the peninsula, I had never seen a spider this large. I suspected that something new was waiting to be described.”
Read more: SMITHSONIAN