Simple examples of malacostracan life histories. Schematic representation of two Malacostracan life histories both involving a zoea-like larva. (a) Left: The larva is formed in embryogenesis, an egg nauplius stage is succeeded by an advanced embryonic stage with postnaupliar segments developed. (b) Right: The zoea-like larva is formed after preceding larval stages. An egg nauplius stage is traversed in both cases (a and b). Naupliar musculature develops in the egg nauplius if a nauplius larva follows. Appendage buds are labeled only in the upper left egg nauplius drawing.