The Pacific Arrow Crab can grow to up to 4-6 inches in width, and is characterized by its triangular shell and 10 long spindly legs. This crab is a nocturnal hunter who feeds on algae, gastropods and small crustaceans. However, the Arrow crab is not a picky eater, and will feed on just about anything dead or slow.
The Pacific Arrow Crab makes its home in reef crevices and rocky intertidal areas. It is found throughout the Mexican Pacific, and, during El Niño years, has been spotted as far as north as the southern California shores of the United States. We photographed this Pacific Arrow Crab during a dive in Hualtuco, Mexico. Read more in our post, Scuba Diving Hualtuco, Mexico.