Figure 5. Developmental timetable of B. schlosseri blastozooid.

The life of each blastozooid lasts about three weeks at 18–19°C: the first week involves the maturation of the budlet, from its appearance to organogenesis mostly concluded; the second week, preceeded by a change of generation during which the budlet becomes a bud and form a new budlet, sees the bud growing, the heart beating, and the organs cytodifferentiation; the third week, again preceded by a change of generation during which the bud become adult, is characterized by filter feeding activity. See the text for details about staging method.