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Fig. 2.38 Morphology and development of endotoichal ovicells in:
( A , E ) Cellaria tenuirostris ; ( B , G , H ) Cellaria aurorae ; ( C , D )
Cellaria fi stulosa ; ( F ) Cellaria diversa . ( A , B ) General view of noncleaned colonies (in A ovicell-bearing parts of colony are infl ated).
( C ) Terminal (growing) part of cleaned colony with ovicells ( arrowed )
at different stages of development. ( D ) Partly cleaned colony fragment showing changes in the shape of ovicell openings ( arrowed ) in
the course of calcifi cation of zooid walls. ( E ) Progressive closure of
ovicell openings ( arrowed ) in old part of colony by calcifi cation of
skeletal walls. ( F – H ) Openings of fully formed ovicells ( F , G ) Noncleaned air-dried specimens; openings arrowed ). Abbreviations: cr
cryptocyst, fm membranous frontal wall, oe ooecium, op operculum,
v ooecial vesicle. Scale bars: A , B , 1 mm; C – E , 100 μm; F , 30 μm;
G , H , 10 μm
2 Cheilostome Brood Chambers: Structure, Formation, Evolution
Fig. 2.38 Morphology and development of endotoichal ovicells in:
( A , E ) Cellaria tenuirostris ; ( B , G , H ) Cellaria aurorae ; ( C , D )
Cellaria fi stulosa ; ( F ) Cellaria diversa . ( A , B ) General view of noncleaned colonies (in A ovicell-bearing parts of colony are infl ated).
( C ) Terminal (growing) part of cleaned colony with ovicells ( arrowed )
at different stages of development. ( D ) Partly cleaned colony fragment showing changes in the shape of ovicell openings ( arrowed ) in
the course of calcifi cation of zooid walls. ( E ) Progressive closure of
ovicell openings ( arrowed ) in old part of colony by calcifi cation of
skeletal walls. ( F – H ) Openings of fully formed ovicells ( F , G ) Noncleaned air-dried specimens; openings arrowed ). Abbreviations: cr
cryptocyst, fm membranous frontal wall, oe ooecium, op operculum,
v ooecial vesicle. Scale bars: A , B , 1 mm; C – E , 100 μm; F , 30 μm;
G , H , 10 μm
2 Cheilostome Brood Chambers: Structure, Formation, Evolution