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How do krill swim through the water?
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malacostracan
Hermit crab (Pagurus samuelis).
As a malacostracan, krill swim through the water primarily through the coordinated, synchronous beating of their thoracic appendages during their larval stages. As adults, their swimming is accomplished by the rhythmic beating of their abdominal [pleopods]. These appendages are typically biramous (two-branched) and work in unison to provide propulsion through the water.12