Abstract
The results of the investigations into the morphology of two bryozoan species Onychocella rowei (Brydone, 1906) and O. mimosa Brydone, 1930 (Cheilostomata: Onychocellidae Jullien, 1881) the specimens of which were discovered in an erratic block of Campanian age located in the vicinity of the town of Grodno (Belarus) are presented. The intra- and intercolonial variability of avicularia of these species are studied. Some colonies of O. rowei are shown to be aberrant forms that exhibit various developmental anomalies of autozooids and avicularia. Some specimens of O. rowei are shown to have reparative avicularia. The taxonomic positions of these species are discussed.
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