Family Erennidae Pugh, 2001 .

Diagnosis. Physonect siphonophores best characterized by their uncoiled tentilla each bearing a hypertrophied cnidoband with nematocysts of three types; large microbasic mastigophores line the margins of the cnidoband, while the other types fill the central region. Terminal process, when present, devoid of nematocysts. Nectophores with basic pattern of upper-, lower- and vertical lateral ridges; with apical muscle-free zone on nectosac; radial canals straight or slightly curved; with ostium opening basally; without mouth plate. Pneumatophore without apical pore. Gastrozooids without peduncle. Dioecious.