500px provided description: Nudibranchs have external gills (the yellow rosette on the back), hence its name, which translates to "naked gill". [#macro ,#animals ,#animal ,#wildlife ,#colorful ,#underwater ,#philippines ,#nudibranch ,#diving ,#dive ,#marine ,#marine life ,#undersea ,#scuba ,#sealife ,#upclose ,#scuba diving ,#marinelife ,#scubadiving ,#anilao ,#muck diving ,#sea slug ,#rhinophores ,#scubadive ,#scuba dive]