As adults, one order in this taxonomic group consists entirely of an externa.
As adults, one order in this taxonomic group consists entirely of an externa. In addition to Rhizocephala, it also contains the extinct order Lipostraca, which consists of only one species, Lepidocaris rhyniensis, thought to be the ancestor of order Anostraca. Although most species in this group excrete using green glands located near the antennae and maxillae, coxal glands are used by the sole surviving member of order Xiphosura. The last segment of the tail in this group is known as the telson, and most members of this group begin life as nauplius larvae. They are distinguished from other arthropods by the presence of a second pair of antennae, and the most well- known members of this group are in order Decapoda. For 10 points, name this subphylum that includes crabs and lobsters.
As adults, one order in this taxonomic group consists entirely of an externa.
{Crustacea} [or {crustaceans}]