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
Anser (bird) Maltese swan "Cygnus equitum" was occasionally placed into "Anser", and "Anser condoni" is a synonym of "Cygnus paloregonus". A goose fossil from the Early-Middle Pleistocene of El Salvador is highly similar to "Anser". Given its age it is likely to belong to an extant genus, and biogeography indicates "Branta" as other likely candidate. ?"Anser scaldii" (Late Miocene of Antwerp, Belgium) may be a shelduck. Two species in the genus are of major commercial importance, having been domesticated as poultry: European domesticated geese are derived from the greylag goose, and Chinese and some African domesticated geese are derived from the swan