Meeting Abstract
Like many other invertebrates, crustaceans have setae which are articulated outgrowths of the exoskeleton. Setae have a multitude of functions including tactile response, chemosensory reception, mechanical action, decoration and protection, and the removal of fouling debris. There is much confusion in the literature regarding the proper usage of terminology when describing the morphology of setal types and structures. Scanning electron microscopy (SEM) examination of pereopods and grooming appendages using several species in two distinct crustacean groups provide excellent examples for the clarification of common setal types as well as the identification of novel setae types and structures. Documentation and description of these novel setae provide an opportunity to clarify the proper use of terminology. Using two species of caridean shrimp (Macrobrachium spp.) and four species of brachyuran crabs (such as Libinia spp.), five novel setae types were identified. In addition, description of common setae types such as simple, spiniform, serrate, and pappose setae along with structures such as denticules, setules, annuli, and spines are offered. The aim of this study is to clarify the setal terminology of crustaceans in hopes that future authors will employ universal language to avoid further confusion and erroneous classifications and descriptions.
