Eucalanus attenatus, female, almost 10 mm long.   Eucalanus crassus and Eucalanus pileatus have been the main experimental animals in the discovery that filter-feeding is not filtering through a sieve but a much more complex action.  E. attenatus is a rather sluggish animal; it moves its mouthparts about five times and then takes a break



This picture has been taken by Paul Dixon, Australian Institute of Marine Science.  Paul was a member of a long cruise to the Coral Sea and Solomon Sea with Dr. Richard Harbison as chief scientist.  Paul used Richard's macroscope with a built-in ring-flash to photograph this live animal.  A similar photograph was used as cover picture for SCIENCE in 1982

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