Uce
Guides
Peracarida
Amphipods, Isopods, and Allies
Peracarida is a superorder of malacostracan crustaceans comprising approximately 12,000 species across 13 orders. The group is defined by the presence of a marsupium (brood pouch) formed by oostegites—flattened plates on the basalmost leg segments of females. Members occupy marine, freshwater, and terrestrial habitats, ranging from minute interstitial forms to the giant isopod Bathynomus giganteus (76 cm) and giant amphipod Alicella gigantea (34 cm). The earliest known peracaridian, Oxyuropoda ligioides, dates to the Late Devonian (~360 mya).
Rhysipolinae
Rhysipolinae is a small cosmopolitan subfamily of braconid wasps comprising approximately 10 genera and more than 80 species. Members are cyclostome wasps characterized by koinobiont ectoparasitoid biology—a rare strategy among Braconidae that deviates from the more common koinobiont-endoparasitoid or idiobiont-ectoparasitoid modes. The subfamily has been taxonomically challenging due to the absence of exclusive morphological diagnostic features, though recent phylogenomic analyses using ultraconserved elements have confirmed its monophyly and clarified some generic boundaries.