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Figure 4 | Frontiers in Zoology

Figure 4

From: The placental analogue and the pattern of sexual reproduction in the cheilostome bryozoan Bicellariella ciliata (Gymnolaemata)

Figure 4

Ovicell formation and structure, and embryonic incubation Bicellariella ciliata (light microscopy). A, early developmental stage showing the round anlage of the ooecial vesicle enclosed by the semispherical anlage of the ooecium; B, zygote in the ovicell with non-developed embryophore (arrow); C, fully-formed empty ovicell with a long tube-like basal part (arrowed) connected with the proximal part of the distal zooid; D, mid-aged embryo in the ovicell with well-developed embryophore (arrows); E, two branches with ovicells incubating embryos of various age and size (distal end of the branch with youngest embryos to the right); F, late embryo in the ovicell with well-developed embryophore (arrows). In E arrowhead points to the septum in the tube-like basal part of the ooecium (pore in the septum plugged by non-specialized cells). Abbreviations: dz, distal zooid; mz, maternal zooid; oc, ooecial coelom; oe, ooecium; v, ooecial vesicle. Scale bars: A, B, 100.0 μm, C, 200.0 μm, D-F, 50.0 μm.

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