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
Branta correctly assigned – meaning that the genus "Anser" was once much more widespread than today and that it coexisted with "Branta" in freshwater habitat which it today does only most rarely – is not clear. Especially in the case of "B. dickeyi" and "B. howardae", doubts have been expressed about its correct generic assignment. The former ""Branta" minuscula" is now placed with the prehistoric American shelducks, "Anabernicula". On the other hand, a goose fossil from the Early-Middle Pleistocene of El Salvador is highly similar to "Anser" and given its age and biogeography it is likely to belong to that genus