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#cryptobiosis

2 public questions tagged with this topic.

Animal Classification

Cryptobiosis is a feature shown by

Cryptobiosis denotes reversible ametabolic dormant state where measurable metabolism becomes undetectably low, enabling survival of desiccation, freezing, anoxia, osmotic stress, vacuum and radiation. Tardigrades exemplify anhydrobiosis forming tun by retracting legs and head, expelling over 95% body water, replacing with protective trehalose and tardigrade-specific intrinsically disordered proteins that vitrify cytoplasm into glass. Metabolism falls to 0.01% normal, allowing survival decades even in space vacuum. Upon rehydration efficient DNA repair restores activity. While rotifers, nematodes and brine shrimp also show cryptobiosis, tardigrades represent premier model for astrobiology and stress tolerance research globally in laboratories.

Ref: Brusca & Brusca, Chapter 21: Tardigrada cryptobiosis and tun; NCBI Extremotolerance review

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Animal Classification

Cryptobiosis is NOT seen in

Cryptobiosis denotes ametabolic dormant state triggered by extreme desiccation, freezing or osmolarity where metabolism becomes undetectably low and organism forms protective tun, cyst or coiled anhydrobiotic form rich in trehalose and LEA proteins forming biological glass. Tardigrades famously enter tun via anhydrobiosis, rotifers produce dormant resting eggs, many nematodes survive soil drying. Vertebrate fishes lack molecular machinery for intracellular vitrification, trehalose accumulation and reversible cytoskeletal stabilization; instead they rely on behavioral avoidance, migration or physiological tolerance like freeze-tolerant heart but not systemic suspended animation. Complex organ systems prevent true whole-body cryptobiosis.

Ref: Campbell Biology, 12th ed., Chapter 33: Anhydrobiosis; NCBI Bookshelf, Cryptobiosis in Invertebrates

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