Crustacean larva stop after a single copepodid stage. Once the gonads develop, there are no further moults. Chalimus (plural chalimi) is a stage of development of a copepod parasite of fish, such as the salmon louse ("Lepeophtheirus salmonis"). "Chalimus" Burmeister, 1834 is also a synonym for "Lepeophtheirus" Nordmann, 1832. The single genus in the Facetotecta, "Hansenocaris", is only known from its larvae. They were first described by Christian Andreas Victor Hensen in 1887, and named "y-nauplia" by Hans Jacob Hansen, assuming them to be the larvae of barnacles. The adults are presumed to be parasites of other animals. Crustacean larva Crustaceans may
Polyphemus (crustacean) Polyphemus (crustacean) Polyphemus is a genus of water fleas, and the only genus in the family Polyphemidae. There are two species, "P. exiguus" and "P. pediculus", although allopatric speciation has resulted in a number of cryptic species of "P. pediculus". "Polyphemus exiguus" inhabits open zones in the Caspian Sea, while "Polyphemus pediculus" exists throughout the Holarctic. It lives in diverse conditions, from small ponds to lakes and estuaries such as the Gulf of Saint Lawrence and the Gulf of Finland. It can be found quite far offshore. "Polyphemus" are a predatory genus of water flea. The two species have four