Athropods:
Arthropoda is the higher phylum for the subphylum’s crustacea and chelicerata. An arthropod is an invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages. The phylum Arthropoda is commonly divided into four subphyla of extant (living) forms: Chelicerata (arachnids), Crustacea (crustaceans), Hexapoda (insects and springtails) and Myriapoda (millipedes and centipedes).
Amphipoda is an order of malacostracan (which is a class of the sub-phylum crustacea), with no carapace (dorsal section) and generally with laterally compressed bodies. Amphipods range in size from 1 to 340 millimetres and are mostly detritivores or scavengers.
Cyproideidae is a family of amphipod crustaceans. Eighteen genera and 43 species have been described as of 2009. They mostly occur mostly in the Southern Hemisphere, where they form associations with corals, sponges, crinoids and hydroids. They are very tiny only around 1mm long.
Barnacles
A barnacle is a type of arthropod constituting the infraclass Cirripedia in the subphylum Crustacea and is hence related to crabs and lobsters.
Chelicerata: Sea Spider
The subphylum Chelicerata constitutes one of the major subdivisions of the phylum Arthropoda. It contains the sea spiders, arachnids, and several extinct lineages. Chelicerates have two body segments, a cephalothorax and an abdomen. Wikipedia
Crustaceans
Crustacea is a large subphylum of the phylum Arthopod, which has over 30,000 members worldwide. They generally have segmented bodies with a head, thorax and abdomen, with a protective calcareous armour outer body. Wikipedia
Lobsters
Lobsters are a family of large marine crustaceans. Lobsters have long bodies with muscular tails, and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, which are usually much larger than the others. Wikipedia
Shrimps and Prawns
Shrimp and prawns are of the decapod order of the subphylum crustacea, with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea (true shrimp) and Dendrobranchiata (commonly known as prawns). Shrimp have one pair of legs that include claws at the end, but prawns have three pairs with claws. Prawns also tend to have legs that are a bit longer in relation to the size of the body than shrimp of similar size.
