[Systematic value of the larval structure and details of postlarval morphogenesis in Bryozoa gymnolaemates]

Among the various species of Bryozoa Gymnolaemata, the larvae and their development were studied, comparing the larval structure and the evolution of their cellular categories during the post-larval morphogenesis the existence of nine well-defined larval types could be revealed. Cases of insufficiently described larvae are discussed. The present systematic of Bryozoa Gymnolaemata is compared with the classification of various larval types. For the major part of cases, each systematic family is marked by a precise type of larva; however there are some exceptions, especially in the ordre Ctenostomata. These discordances may suggest some rearrangements of the classification utilized at the present time.