Polyplacorphora : Many plates
Examples :
- Can also be known as chiton
- 940 different species
- Live all around the world from cold waters to tropical waters
- Marine habitats
- Live on hard surfaces such as rocks
- Live in deep waters
- Have a protective shell
- Gridle may have scales, spicules, or spikes
- Creeps along slowly with their muscular foot
- Anterior plate is normally crescent-shaped
- External sexual reproduction
- Can range from 0.5 centimeters to 30 centimeters long
Examples :
- Ischnochiton
- Neoloricata
- Chitonida
- Cryptoplacoidea
Gastropoda : Gaster, stomach, and poda, feet
Examples:
- Come in many sizes from microscopic to large organisms
- Most highly diverse class within the Mollusca phylum
- Are terrestrial as well as marine organisms
- Live in many different habitats such as gardens, woodlands, deserts, mountains, rivers, ditches, and lakes
- Most organisms in the class have shells which can be used to draw themselves inside
- Some are very colourful to either camouflage into their environment or to serve as a warning
- Make up 40% of the Mollusca phylum
Examples:
- Nudibranch
- Prosobranchia
- Ampullariidae
- Abalone
- Aplysia
- Limacidae
- Stylommatophora
- Muricidae
- Conidae
- Cypraeidae
- Achatinidae
Bivalva : bis- two, valvae-leaves of a door, since these organisms’ shells open and close like doors
Examples:
- Are also commonly known as shellfish
- Aquatic organisms
- Can be found in fresh waters, salt waters, on the seafloor, on sea beds, or attached to hard surfaces
- Hide themselves in sediment to stay out of sight of predators
- Their shells are known as valves
- Open their shells to move and consume food, but shut it as soon as they sense danger
- Posses a siphon to obtain food
- Most species lack eyes; unneeded due to their cloudy environment
Examples:
- Mytilidae
- Scallops
- Ostreidae
- Veneridae
- Unionidae
- Rudists
- Veneroida
- Solenidae
- Spondylus
- Corbiculidae
- Pteriomorphia
- Arcidae
- Pholadidae
- Anomiidae
Cepalopoda : head + pous, pod- foot
Examples :
- Invertebrate
- Over 700 species
- Have cirri, suckers, or hooks on their arms
- Strict carnivores
- Ability to change colour
- Posses three hearts
- Eyes capable of producing images
- Larger brain than other vertebrates
- Marine animal
- Found in oceans but not freshwater
- Movement occurs with jet- propulsion
- Have an ink sac
Examples :
- Octopus (Octopoda)
- Squid (Teuthida)
- Cuttlefish (Sepiida)
- Ammonite (Ammonoidea)
- Nautilidae
- Coleoidea
- Belemnitida
- Orthoceras