179
Fig. 2.21 Age-related gradual sealing of the communication slit, with
formation of communication pores, in calloporid ooecia: ( A ) Callopora
lineata ; ( B ) Callopora craticula ; ( C ) Callopora dumerilii ; ( D ) Tegella
unicornis . ( A ) Arc-like communication slit ( arrowed ) in young ovicell.
( B ) Partly closed communication slit ( arrowed ). ( C , D ) One ( C ) and
three ( D ) communication pores ( arrowed ) remaining after the closure
of the communication slit (( A ) – From Ostrovsky and Schäfer 2003 ,
courtesy of John Wiley and Sons, http://onlinelibrary.wiley.com/
doi/10.1046/j.1463-6395.2003.00121.x/abstract ; ( B ) – From Ostrovsky
et al. 2009a , courtesy of Springer Verlag, http://link.springer.com/
article/10.1007/s00435-008-0070-8 ; ( D ) – From Ostrovsky et al. 2003 ,
courtesy of Elsevier, http://www.sciencedirect.com/science/article/pii/
S0044523104701047 ). Abbreviations: bw basal wall, cr cryptocyst,
lw lateral wall, mz maternal zooid, of ovicell fl oor, tw transverse wall.
Scale bars: A , B , 30 μm; C , 10 μm; D , 100 μm
Figures