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Embryonic development of the shell in biomphalaria glabrata (Say)

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Figure

Fig. 1. The formationand closurebatchx500.Apical protrusionsare late stagesat the rim of the closing SF/.and electron lucent vesiclesof1he SFI in 1rochophorelarvae.A-C show trochophorelarvae with 35 h of development.D-J stem from oneof 37 h of development.
Fig. 2. TheformationApexof theperiostracumin trochophorestage(37-40hi. TheTEMspecimenswerefixedaccordingto Probst119861.IAI SEMx500.Cells, of whichthe microvilliform a rosette-likestructure(arrows),enclosethe SF'
Fig. 3. Calcificationof theperiostracum embryonicshell in trochophorestagewith45 h of development.{AI SEM x400
Fig. 4. The differentiationof the outermantleepithelium.(AI SEM x300. Latera/viewshowingthe right side of an embryoafter 50 h of development.The she/!($), tentaclesrTJ, foor(F) andthe stomodaeum(SO are distinct.(B) LM x520.Veligerstage(50 h)
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