David Fleetham / Opening in the mantle of Giant clam (Tridacna gigas) Tubbataha Reef, Philippines.

Luis Quinta / Body of deep sea squid floating near the surface, with mantle ripped up possibly by cetaceans such as Sperm whales which are present in the region, Pico Island, Azores, Portugal, May.

Alex Mustard / Flamingo tongue (Cyphoma gibbosum) feeding on a seafan (Gorgonia ventalina) Cyphomas feed on corals and concentrate the toxic chemicals into their mantle, which they then wrap around the outside of it...

Juergen Freund / Bivalve mollusc lives in crevices in colonies of living hard corals. Only the the shell opening and mantle are visible, along with the minute eyes along its margin, West New Britain, Papua New Guinea.

Juergen Freund / Details of Thorny oyster (Spondylus varius) with "eyes" in its mantle edge near the shell, New Ireland, Papua New Guinea

David Shale / View inside the mantle of the deepsea Octopod {Grimpoteuthis discoveryi} Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Deepsea octopus (Benthoctopus sp) mantle showing suckers, deep sea Atlantic oceandeep sea

Michael Pitts / Giant clam mantle {Tridacna gigas} and siphon, Palau, Micronesia

Pete Oxford / Male Golden mantle saddleback tamarin with young. Yasuni NP {Saguinus tripartitus} Ecuador

Nigel Cattlin / Spanish slug (Arion vulgaris) with closed pneumostome on grass, light grey colour variation. Berkshire, England, UK. August.

Nigel Cattlin / Spanish slug (Arion vulgaris) on grass, tan colour variation. Berkshire, England, UK. August.

Georgette Douwma / Kaleidoscopic image of Pattern on the mantle of a clam. Indonesia.