Crustaceans are a diverse assemblage of animals that includes not only the wellknownshrimps, lobsters, and crabs but also a variety of less familiar but biologicallyimportant groups. Inhabiting primarily aquatic habitats, crustaceans might be considered the marine equivalent of their overwhelmingly terrestrial brethren, the insects.However, knowledge about the sexual biology of crustaceans is slight in comparison to what is known for insects and many other animal groups. In spite of theimportance of selection pressures related to successful mating on the morphology, behavior, life histories, and phylogeny of crustaceans, many aspects of sexattraction, mating behavior, and insemination remain poorly known. A review of the literature on crustacean reproduction revealed that there was no comprehensivetreatment of crustacean sexual biology but that in recent years much new exciting work has been (and is being) done in this area. Accordingly, we organized asymposium titled "Sex Attraction, Mating Behavior, and Insemination in Crustacea," cosponsored by the Crustacean Society and the Invertebrate Zoology Division ofthe American Society of Zoologists, with travel