Trochosphere and veliger stages of development are consequently not recognizable.
There is a veliger stage in development, but the velum is reduced.
It is purely a larval organ, disappearing before the close of the veliger stage.
Except in Oncidium, there is no longer a veliger stage in development.
E, The trochosphere passing to the veliger stage, dorsal view showing the formation of the primitive shell-sac.