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The sand diver lizardfish opened its mouth to allow the goby inside to clean.
(Mt. Irvine Extension, Tobago, British West Indies)
fish; lizardfish; sand diver; Chordata; Osteichthyes; Aulopiformes; Synodontidae; Synodus intermedius; cleaning behavior; commensal behavior;
goby; cleaning goby; Perciformes; Gobiidae; Gobiosoma genie, Caribbean