Two groups of scientists studying the biology of marine invertebrate animals will board the ship R/V Laurence M. Gould and embark on a 5-week voyage through Argentine and Antarctic waters. During the cruise they will examine invertebrates, animals without backbones, that live in the water column and on the ocean’s bottom. One of the groups will study the biology of salps, a group of animals living in the water column that are closely related to vertebrates. The other team will explore how larval forms might disperse between South America and Antarctica, and if there is unrecognized genetic variation in marine Antarctic species.