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Fig. 2.42 Schematic longitudinal sections of hyperstomial noncleithral ovicells in: ( A ) Turbicellepora crenulata ; ( B ) Turbicellepora
avicularis ( arrows indicate communication pores connecting distal
kenozooidal and maternal autozooidal coeloms). Abbreviations: as
ascus, av avicularium, bc brood cavity, dz distal zooid, ес ectooecium,
en entooecium, fr frontal shield, hc hypostegal coelom, mz maternal
zooid, ос ooecial coelom, of ovicell fl oor, op operculum, рр pseudopore, tw transverse wall
2 Cheilostome Brood Chambers: Structure, Formation, Evolution
Fig. 2.42 Schematic longitudinal sections of hyperstomial noncleithral ovicells in: ( A ) Turbicellepora crenulata ; ( B ) Turbicellepora
avicularis ( arrows indicate communication pores connecting distal
kenozooidal and maternal autozooidal coeloms). Abbreviations: as
ascus, av avicularium, bc brood cavity, dz distal zooid, ес ectooecium,
en entooecium, fr frontal shield, hc hypostegal coelom, mz maternal
zooid, ос ooecial coelom, of ovicell fl oor, op operculum, рр pseudopore, tw transverse wall
2 Cheilostome Brood Chambers: Structure, Formation, Evolution