Figure 6 in Brood chambers constructed from spines in fossil and Recent cheilostome bryozoans

Figure 6. Stichomicropora oceani (d'Orbigny), Lower Cenomanian, Sarthe, France, NHM D55549. A, growing edge of a colony, showing pore chambers and intrazooecial budding style. B, nonbrooding zooids, with oral and proximal mural spines. C, oblique view of the colony, with brooding and nonbrooding zooids. D, orifice of maternal zooid and ovicell spine bases arranged in a distally concave arch along the mural rim of the distal zooid, apart from the outermost spine bases which are slightly separated from the mural rim. Scale bars: A = 250 Mm; B, C = 100 Mm; D = 50 Mm.