Lopretto, Estela C. Facultad de Ciencias Naturales y Museo, Museo de La Plata, La Plata, Argentina.
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An extant order of the crustacean superorder Syncarida confined to freshwater and recorded from both surface and subterranean waters. Members of the order Anaspidacea (anaspidaceans) lack a carapace. The first thoracomere (thoracic somite) is incorporated in the head to form a cephalothorax, with its appendages modified as maxillipeds. The remaining thoracic legs have both epipods (outgrowths borne by the basal region of the appendages) and exopods (outer branches of the biramous appendages). There are six free pleomeres. The first antennae usually have statocysts, that is, sensory organs of equilibrium. The first two pairs of pleopods of the male are modified in a petasma for sperm transfer. See also: Bathynellacea; Crustacea; Syncarida
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