AbstractThe termdevelpomental psychobiologyimplies an integration between psychology and biology. But what segment of biology does the discipline embrace? The present commentary asserts that developmental psychobiology devotes too much attention to structural biology, with its emphasis on proximate mechanisms, and fails to give enough prominence to evolutionary biology and ultimate perspectives. I have attempted to portray the significance of evolution to developmental psychobiology and to elaborate on how developmental psychobiology might contribute to refinements in evolutionary theory, especially recent modifications that advocate a greater role for developmental processes. Methodological suggestions are offered, which would broaden developmental psychobiology's perspective so that a more comprehensive analysis of behavioral development results. © 1995 John Wiley & Sons, Inc.