Sensory Setae on the Major Chelae of Male Crayfish, Orconectes Rusticus (Decapoda: Astacidae) – Impact of Reproductive State on Function and Distribution

Abstract

Abstract The major chelae of reproductive male crayfish contain both smooth and plumose setae and are used for the perception of female odors. A comparative and morphological analysis of setae found on the major chelae of reproductive (form I) and non-reproductive (form II) male crayfish, Orconectes rusticus was performed in order to elucidate the distribution and function of smooth and plumose setae. In particular, the distribution of setae between reproductive forms was quantified as well as putative sensory functions, based on morphological characteristics, for both smooth and plumose setae. To accomplish these goals, scanning electron microscopy, a porosity assay, anterograde labeling, and acetylated tubulin (AT) immunocytochemistry were used. We found that form I crayfish have significantly more pockets of sensory setae and individual smooth setae on their major chelae when compared to form II males. Scanning electron microscopy revealed a terminal apical pore-like structure in smooth setae that was ...