Polychelida
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Polychelida is an infraorder of decapod crustaceans. Fossil representatives are known dating from as far back as the Upper Triassic. A total of 38 extant species, all in the family Polychelidae, and 5
Cycleryon propinquus (Eryonidae)
Palaeopentacheles roettenbacheri (Palaeopentachelidae)
Proeryon hartmanni (Coleiidae)
Achelata
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The Achelata is an infraorder of the decapod crustaceans, holding the spiny lobsters, slipper lobsters and their fossil relatives.
Phyllosoma larva (micrograph)
Palinurus elephas Palinuridae
Palinurellus gundlachi Palinuridae, formerly Synaxidae