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thelongprocessesonthebody(WALLACEandSNELL1991).Representativesof
thegenusKeratelladonotleap;toavoidthepredaciousAsplanchnaorthesuck-
ingflowofsuspension-feedingcrustaceans,theyarecapableofincreasingtheir
swimmingspeed3.5times(GILBERTandKRIK1988).Planktonicrotifersthathave
evolvedvariousprocessesonthebody,e.g.,speciesofthegeneraFilinia,Pol-
yarthra,andHexarthra,havelostthefootasanunnecessaryballastthathampers
swimming.Thelackofrotationasanelementofswimmingisobservedinafew
rotifersonly;thesemaymoveheadfirst(Asplanchna)orfootfirst(Conochilus).
Creepingrotifersmovebyemployingtheciliaoftheircorona(Notommata)oruse
theheadandfoot(Bdelloidea).
Fig.16.Rotifermovement(afterRUPPERTandBARNES1991)
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