Adaptive evolution of larvae and life cycles

The larval patterns of marine invertebrates pose intriguing questions for b oth evolutionary and developmental biologists. However, combined investigat ions have Been rare. Quantitative models analyze the selective factors that drive evolutionary change in larval nutrition and timing of metamorphosis. Developmental studies describe the morphogenesis characterizing ancestral and derived larval patterns. Rigorous evolutionary analysis of the transiti on to derived modes of development is lacking and detailed developmental an d ecological data are needed to test and refine theoretical models. A major challenge facing studies of life cycle evolution is the elucidation of the genetic structure and covariance of important developmental and larval tra its.