Longitudinal Observation of Japanese Lancelet, Branchiostoma japonicum, Metamorphosis

Figure 1

Time course of individual metamorphosis in Branchiostoma japonicum at temperature fluctuated between 21.5 and 24.0°C. Note the individual variation of the duration and rapid expansion of ciliate surface by both opening of secondary gill series and division of each gill pore with tongue bar. The number of the animals corresponds to that in Figure 2.