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Fig. 1. (A) Location of fan organs and major chemoreceptors (antennules) of
crayfish. The fan organs are multisegmental flagellae (exopodites) of the
mouthparts (maxillipeds) and are feathered distally (B). (B,C) Scanning
electron micrographs taken during the power stroke (B), showing the extended
feathered hairs. During the recovery stroke (C) the feathered hairs are folded
in. Scale bars, 1 mm. Reprinted from Breithaupt
(Breithaupt, 2001) with
permission of The Biological Bulletin.