Close-up of the mantle and siphon of giant clam, Sabah, Malaysia, Borneo, Southeast Asia, Asia

Fluted giant clam (Tridacna squamosa) mantle detail, Namu Atoll, Marshall Islands, Micronesia, Pacific

Fluted giant clam (Tridacna squamosa), detail of mantle and eye spots, Rongelap, Marshall Islands, Micronesia, Pacific

Giant clam (Tridacna sp) detail of mantle and eyes, Dauin, Negros, Philippines, Southeast Asia, Asia

Giant clam (Tridacna gigas), detail of mantle covered with eye spots, Rongelap, Marshall Islands, Micronesia, Pacific

Giant clam, mantle detail, Tridacna gigas, Rongelap, Marshall Islands (N. Pacific).

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Fiji, Indo-Pacific sergeant major egg mass on the shell of a giant tridacna clam (Tridacna gigas).

This Common Scorpionfish (Scorpaenopsis oxycephala) is perched on the mantle rim of a Giant Tridacna Clam (Tridacna gigas). It's venomous spines can inflict a painful wound, Philippines

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau

Iridescent Mantle of Giant Clam, Tridacna Squamosa, Micronesia, Palau