Note
Polychaetes show great diversity with respect to ovarian morphology, mechanisms of vitellogenesis and the types of yolk stored in their eggs. This diversity probably reflects interspecific differences in the role of yolk during larval development. Because of the limited number of species investigated and the relatively recent use of analytical techniques, little is known of the origins and chemistry of yolk in polychaete eggs although vitellogenic mechanisms are probably very species specific.