The Achelata is an infraorder of the decapod crustaceans, holding the spiny lobsters, slipper lobsters and their fossil relatives.
Haeckel Phyllosoma
Phyllosoma larva (micrograph)
Palinurus elephas Palinuridae
Palinurellus gundlachi Palinuridae, formerly Synaxidae
A decapod is a crustacean in the large order of Decapoda within the class Malacostraca, including crabs, lobsters, crayfish, shrimp, and prawns. Most decapods are scavengers. The order is estimated to
Achelata
…The Achelata is an infraorder of the decapod crustaceans, holding the spiny lobsters, slipper lobsters and their fossil relatives. The name "Achelata" derives from the fact that all the members…
"Decapoda" from Ernst Haeckel's Kunstformen der Natur, 1904
Whiteleg shrimp, Litopenaeus vannamei (Dendrobranchiata: Penaeoidea)
Heterocarpus ensifer (Caridea: Pandaloidea)