Yellowline arrow crab (Stenorhynchus seticornis) with iridescent blue claws, living inside purple sponge, Playa del Carmen, Mexico Published July 27, 2018 at 1280 × 853 in Playa del Carmen Dive III – Cozumel trip Yellowline arrow crab (Stenorhynchus seticornis) with iridescent blue claws, living inside purple sponge, Playa del Carmen, Mexico Yellowline arrow crab (Stenorhynchus seticornis) with iridescent blue claws, living inside purple sponge, Playa del Carmen, Mexico