H: Sea Slug, Nudibranch, Snail, Bivalve, Chiton, Limpet and Octopus

     (Phylum Mollusca)

       Mollusk means 'soft-bodied'. Indeed, among the few features shared by all    molluscs is a soft body. To protect this soft body, some snails produce a shell, while clams produce a two-part shell. Slugs that lack shells often have toxins and other     defenses. Others like squids and cuttlefish rely on speed instead.  Mollusks are       highly diverse, not only in size and in anatomical structure, but also in behavior and      in habitat.


Sea Slug

    Sea slug are snails without shells, and are hermaphrodites. They are  very well camouflaged. Don't step on them. Sea slugs graze on algae on the rock.

H1 Rock onchidium

                                   H1: Rock onchidium 

                                 Scientific name: Onchidina sp.



         An octopus searches for prey mostly at night, spreading out its eight long arms to feel into crevices for crabs, prawns, snails, clams and other such morsels. The highly flexible arms have strong suckers to grip objects so that the octopus can slowly 'creep' over the surface as it stealthily investigates all hiding places. The arms also have numerous receptors sensitive to taste and touch. 

H2 Octopus

                                           H2: Octopus

                                           Scientific name: Unidentified



           Nudibranch means 'naked gills'. To protect themselves, some produce distasteful    substances, toxins and even acids. Being small and flat, they can easily hide in narrow places.

H3 Nudibranch

                                                   H3: Nudibranch

                                                      Scientific name: Unidentified



          Limpets are molluscs with an uncoiled, umbrella-shaped shell, often with ribs. Limpets can move! But only at high tide. The area around a limpet is often grazed bare of algae.

H4 Limpets

                                            H4: Limpets

               Scientific name: Patelloida saccharinodes



               A snail makes its own shell and stays in the same shell all its life. It does not molt its shell like a crab does. You can only remove a snail from its shell by killing it. Shells sold as souvenirs are mostly obtained by harvesting living snails and killing them.

Family Nassariidae

H5 Olive whelk

                                                    H5: Olive whelk

                                            Scientific name: Nassarius olivaceus


H6 Olive dog whelk

                                   H6: Olive dog whelk

                      Scientific name: Nassarius pullus


H7 Common whelk

                                            H7: Common whelk

                                  Scientific name: Nassarius livescens


Family Cerithiidae

H8 Plain creeper snail

                                     H8: Plain creeper snail

                                Scientific name: Clypeomorus sp.



H9 Creeper snail

                                       H9: Creeper snail

                                  Scientific name: Unidentified



H10 Girdled horn snail

                                                H10: Girdled horn snail

                                        Scientific name: Unidentified



Family Olividae

H11Olive snail

                                                H11: Olive snail

                                       Scientific name: Oliva sp.


Family Conidea

H12 Cone shell1

                                                     H12: Cone shell1

                                            Scientific name :Conus eburneus


H13 Cone shell2

                                            H13: Cone shell2

                                 Scientific name: Unidentified


Family Architectonicidae

H14 Sundial snail

                                        H14: Sundial snail

                     Scientific name: Architectonica  perspectiva


Family Cypraeacea

H15 Cowry snail

                                               H15: Cowry snail

                                           Scientific name: Cypraeaarabica

Family Littorinidae

H16 Mangrove periwinkle

                                              H16: Mangrove periwinkle

                                       Scientific name: Littoraria sp.


H17 Ridged periwinkle

                                    H17: Ridged periwinkle

                         Scientific name: Echinolittorina sp.1


H18 Knobbly periwinkle

                                    H18: Knobbly periwinkle

                          Scientific name: Echinolittorina sp.2


Family Muricidae

H19 Spiny drill 1

                                      H19: Spiny drill 1

                              Scientific name: Unidentified


H20 Spiny drill 2

                                       H20: Spiny drill 2

                                 Scientific name: Unidentified


H21 Knobbly drill

                                          H21: Knobbly drill

                                   Scientific name: Morula sp.1



H22 Oval moon snail

                                        H22: Oval moon snail

                                    Scientific name: Polinices sp.



H23 Calf moon snail

                                                  H23: Calf moon snail

                                                       Scientific name: Natica sp.1



H24 Tiger moon snail

                                                     H24: Tiger moon snail

                                  Scientific name: Natica sp.2


Family Neritidae

H25 Nerit snail

                                                       H25: Nerit snail

                                        Scientific name: Nerita sp.1


H26 Green pea snail

                                              H26: Green pea snail

                            Scientific name: Clithon oualaniensis


Family Strombidae

H27 Dog Conch

                                         H27:  Dog Conch

                Scientific name: Strombus canarium


H28 Black lipped conch

                                     H28: Black-lipped conch

                     Scientific name: Strombus urceus



H29 Streak lipped conch

                                     H29: Streak-lipped conch 

                            Scientific name: Strombus sp. 1


H30 Orange lipped conch

                                      H30: Orange-lipped conch

                            Scientific name: Strombus sp. 2


Family Ranellidae

H31 Triton snail

                                         H31: Triton snail

                         Scientific name: Gyrineum sp.



H32 Button snail

                                                          H32: Button snail

                                     Scientific name: Umbonium sp.


 Clams or Bivalves

   Bivalves are mostly sedentary and don't move about as much as most gastropods. Many are adapted to live buried in soft sea bottoms, some live permanently attached to a hard surface. Being mostly immobile, peaceful filter-feeders, most bivalves don't have a head. Burrowing bivalves have a flattened, blade-like foot to burrow with. Oysters that stick to hard surfaces don't even have a foot.


 Family Tridacnidae

H33 Giant clam

                                                        H33: Giant clam

                                       Scientific name: Tridacna sp.


Family Cardiidae

H34 Yellow cockles

                                                       H34: Yellow cockles

                                   Scientific name: Trachycardium sp.


Family Arcidae

H35 Hairy cockles

                                   H35: Hairy cockles

       Scientific name: Anadara gubernaculum



Family Mactridae

H36 Trough clams

                                      H36: Trough clams

                     Scientific name: Unidentified


Family Ostreidae

H37 Plain rock oyster

                                                    H37: Plain rock oyster

                                    Scientific name: Unidentified


H38 Zig zag rock oyster

                                           H38: Zig zag rock oyster

                                   Scientific name: Unidentified


Family Pteriidae

H39 Pearl oysters

                                                      H39: Pearl oysters

                                        Scientific name: Pinctada sp. 2



Family Pinnidae

H40 Flag pen shell

                                                         H40: Flag pen shell

                                                        Scientific name: Atrina vexillum



H41 Bicoloured fan shell

                                                           H41: Bicoloured fan shell

                                        Scientific name: Pinna bicolor