Tardigrada

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Tardigrada (nomen a Spallanzani anno 1777 statutum) sunt animalia minima et ursiformia. Magnitudo max. 1.5 mm, min. 0.15 mm. Pedes: octo (in genere hexapodibus reducti). Systema nervi ventralis est cum gangliis in segmentis omnibus. Tardigradae supervivunt multis rebus adversis: vacuo, temperaturis sub 20 K et super 370 K, radiationibus, et ceteris. Tardigradae in aqua salina vel dulce vivunt. 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 ultra 50 annos.

Anatomia tardigradorum

• caput cum cerebro multilobato, ocellis, ore
• corpus divisum in quattuor segmentis
• duo pedes retractibiles pro segmento
• sine corde aut organis respiratoriis

Nexus externi

• Tardigrada at Animaldiversityweb
• Tardigrada Newsletter
• tardigrades
• tardigrades taxa

Notae

• Brusca, R.C. & Brusca, G.J. 1990. Invertebrates. Sinauer Associates, Sunderland.
• Margulis, L. & Schwartz, K.V. 1982. Five Kingdoms. An Illustrated Guide to the Phyla of Life on Earth. W.H.Freeman, San Francisco..
• Margulis, L. & Schwartz, K.V. 1998. Five Kingdoms. An Illustrated Guide to the Phyla of Life on Earth. W.H. Freeman, New York..
• Nielsen, C. 1995. Animal Evolution: Interrelationships of the Living Phyla. Oxford University Press, Oxford..
• Ruppert, E.E., Fox, R.S. & Barnes, R.D. 2004. Invertebrate Zoology. Seventh Edition. Thomson, Brooks/Cole.: vii-xvii, 1-963, I1-I26.
• Storer, T.I., Usinger, R.L., Stebbins, R.C. & Nybakken, J.W. 1979. General Zoology, Sixth Edition. McGraw-Hill Book Company, New York.: i-ix, 1-902.
• Giribet, G., Distel, D.L., Polz, M., Sterrer, W. & Wheeler, W.C. 2000. Triploblastic Relationships with Emphasis on the Acoelomates and the Position of Gnathostomulida, Cycliophora, Plathelminthes, and Chaetognatha: A Combined Approach of 18S rDNA Sequences and Morphology. Syst. Biol. 49(3): 539-562.
• Kaczmarek, L. & Michalczyk, L. 2006. The Tardigrada Fauna of Mongolia (Central Asia) with a Description of Isohypsibius altai sp. nov. (Eutardigrada: Hypsibiidae). Zoological Studies 45(1). [Online]
• Nelson, D.R. 2002. Current Status of the Tardigrada: Evolution and Ecology. Integ. and Comp. Biol. 42(3): 652-659.
• Morgan, C.I. 1982. Tardigrada. In Parker, S.P., Synopsis and Classification of Living Organisms, vol. 2. McGraw-Hill, New York: 731-739.
• Van der Land, J. 2001. Tardigrada. In Costello, M.J., Emblow, C.S. & White, R. (eds.), European Register of Marine Species. A check-list of the marine species in Europe and a bibliography of guides to their identification, Patrimoines naturels 50.