Note
Recent studies of ascidian larval biology reveal a diversity of structure and behaviour not previously recognised. The introduction of direct methods for observing ascidian larvae in situ has provided important insights on larval behaviour, mortality, and dispersal not possible with the microscopic larvae of most other marine invertebrates. In the context of these recent advances, this review considers the ecology of pelagic phases (egg, embryo, and larva) of the ascidian life cycle and relates aspects of reproduction and larval biology to the recruitment, abundance, and distribution of adult populations.