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
Apus (genus) Linnaeus in 1758. The name "Apus" is Latin for a swift, thought by the ancients to be a type of swallow with no feet (from Ancient Greek α, "a", "without", and πούς, "pous", "foot"). Before the 1950s, there was some controversy over which group of organism should have the genus name "Apus". In 1801 Bosc gave the small crustacean organisms known today as "Triops" the genus name "Apus", and later authors continued to use this term. Keilhack suggested (in 1909) that this was incorrect since there was already an avian genus named "Apus" by Scopoli in 1777 . It was