Tardigrada
E Vicipaedia
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Index |
[recensere] Phylum Tardigrada
Tardigradae animalia minima et ursiforma sunt. Magnitudo max. 1.5 mm, min. 0.15 mm. Pedes: octo (in genere hexapodibius reducti). Systema nervi ventralis est cum gangliis in segmentis omnibus. Tardigradae supervivunt multa: vacuum, temperaturae sub 20 K et super 370 K, radiatio, et cetera. Tardigradae vivunt in aqua salina vel non salina. Vivunt in abysso maris sub 4000 m et in summis montibus super 6000 m. Tardigradae, qui in temperaturis sub 20 K se glaciant, superesse possunt super 50 annos.
[recensere] Anatomia tardigradorum
- caput cum cerebro multilobato, ocellis, ore
- corpus divisum in quattuor segmentis
- duo pedes retractibiles pro segmento
- sine corde aut organa respiratorica
[recensere] Systematica
- Superdominium: Biota (Vitae)
[recensere] Classes
- Arthrotardigrada cum cirri cephalicae
- Mesotardigrada
- Eutardigrada sine cirri cephalicae