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Fig. 1. (A) Anterior aspects of Procambarus clarkii, showing the long
paired second antennae (asterisks) and the biramous antennules, the lateral
flagella of which are indicated by white arrows. There is an upward curve to
each lateral flagellum, which in this large animal is 2.5 cm long. (B) Several
annuli of a lateral antennular flagellum of P. clarkii. Aesthetasc
sensilla (asterisks) are arrayed ventrally on each annulus of the distal half
of the flagellum, usually in groups of 2–4. At least three other types
of sensillum occur on the medial and lateral flagella, including the most
numerous class, the beaked hairs, indicated here with white arrows, and a
standing feathered hair (white caret).
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