-The Angler Fish

-The Gulper Eel

-The Vampire Squid

-The Sea Cucumber

-Tube worms

-Pompey worms

-Serrate octopus

-Dumbo octopus

-Telescope octopus

-Giant spider crab

-Viper fish

-biscuit star

-comb jellyfish

-luminescence star

-Remipedia

-ping pong sea sponge

-deep sea urchin

There are not five clean cut classes of arthropoda. There are three classes under the subphylum Chelicerata, which are: Pycnogonida, Merostomata, and Arachnida. Then under the subphylum Mandibulata, there are three superclasses: Myriapoda, Crustacea, and Hexapoda. Myriapoda has four classes: Chilopoda, Diplopoda, Pauropoda, and Symphyla. Crustacea have six classes: Ostracoda, Maxillopoda, Remipedia, Cephalocarida, Branchiopoda, and Malacostraca. The Hexapoda superclass has four classes: Collembola, Protura, Diplura, and Insecta.

Branchiopods appear to be entirely aquatic although some live in fresh and some in salt water. The arthropod subphylum Crustacea is rich with aquatic organisms, and the subphylum most prone to have mostly aquatic classes. The classes include Branchiopoda, Remipedia, Cephalocarida, Maxillopoda, Ostracoda and Malacostraca. Many of these will have non-aquatic exceptional species in their classification. The Cephalocarida for example are benthic but found in the intertidal zone. Malacostraca with the lobsters, crabs, shrimp etc. are mostly aquatic but again will evidence exceptions like the terrestrial woodlice. Ostracoda are again mostly aquatic, but have exceptions living on moist forest soil, etc.

Phylum Arthropoda hosts at least eighteen classes, (not counting those yet to be fully classified):

Trilobita - trilobites (extinct)

Arachnida - Spiders, scorpions, etc.

Merostomata - horseshoe crabs, eurypterids (extinct), etc.

Pycnogonida - sea spiders

Chilopoda - centipedes

Diplopoda - millipedes

Pauropoda - sister group to millipedes

Symphyla - resemble centipedes

Branchiopoda - brine shrimp etc.

Remipedia - blind crustaceans

Cephalocarida - horseshoe shrimp

Maxillopoda - barnacles, copepods, fish lice, etc.

Ostracoda - seed shrimp

Malacostraca - lobsters, crabs, shrimp, etc.

Insecta - insects

Entognatha - wingless

Camptophyllia (extinct)

Marrellomorpha (with one extinct species)

Phylum Arthropoda hosts at least eighteen classes, (not counting those yet to be fully classified):

Trilobita - trilobites (extinct)

Arachnida - spiders, scorpions, etc.

Merostomata - horseshoe crabs, eurypterids (extinct), etc.

Pycnogonida - sea spiders

Chilopoda - centipedes

Diplopoda - millipedes

Pauropoda - sister group to millipedes

Symphyla - resemble centipedes

Branchiopoda - brine shrimp etc.

Remipedia - blind crustaceans

Cephalocarida - horseshoe shrimp

Maxillopoda - barnacles, copepods, fish lice, etc.

Ostracoda - seed shrimp

Malacostraca - lobsters, crabs, shrimp, etc.

Insecta - insects

Entognatha - wingless

Camptophyllia (extinct)

Marrellomorpha (with one extinct species)