In Illiger's category of animals (1811), the fourteenth order, containing the sirenians and cetaceans as two families, Sirenia and Cete: identical to Mutilata.
A division of azygobranchiate gastropods, containing the natant or free-swimming oceanic or pelagic types often known as heteropods, and matching into the course or purchase Heteropoda.: opposed to Reptantia.
A section of cephalate mollusks recommended when it comes to cephalopods.
A suborder of peritriehous ciliate infusorians, containing people who tend to be free-swimming: against Sedentaria.