Abstract
Slices of cryptobiotic and developing cysts of the brine shrimp, A. salina , were fixed in glutaraldehyde and osmium tetroxide for electron microscopy. The shell was similar to insect egg shells in having a hypochlorite-soluble chorion and a fibrous, hypochlorite-resistant cuticle. Between the chorion and cuticle was a thin but complex membrane that resisted solution in hypochlorite and was impermeable to lead ions. The extra-embryonic, subcuticular space usually contained many small particles in the cryptobiotic cyst. The particles disappeared during development and were replaced by the hatching membrane. After being released from the brood sac, at least some cysts are covered by a cellular membrane. Upon air-drying (i.e., entry into cryptobiosis) this outer membrane is destroyed, and subsequent wetting reinitiates development in the encysted gastrula.
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