FIGS 6 in Cleavage pattern in Oscarella species (Porifera, Demospongiae, Homoscleromorpha): transmission of maternal cells and symbiotic bacteria

FIGS 6±9. (6) Asynchronous cleavage in the embryos of O. lobularis at the stage 16 blastomeres (B) (SEM). N, nucleus. Scale bar: 50 Mm. (7) Semi-thin section through the cleaving embryos of O. imperialis at the stage 10 blastomeres (B). Fo, follicle. Scale bar: 50 Mm. (8) Blastomere of the embryo of O. imperialis at the stage 16 blastomeres (TEM). N, nucleus; Nu, nucleolus; Y, yolk granule; Ba, symbiotic bacteria; Fc, follicular cells; Co, collagen layer of the follicle. Scale bar: 5 Mm. (9) Cleaving embryos of O. lobularis at the stage 24 blastomeres (B) (SEM). Fo, follicle; Mc, maternal cells; Ex, exhalant canal. Scale bar: 50 Mm.