Belongs within: Parachela.
The Hypsibiinae are a group of tardigrades lacking a pharyngeal, and which lay smooth eggs in exuviae.
<==Hypsibiinae
|--HypsibiusKF00
| |--H. arcticusKF00
| |--H. convergensNH90
| |--H. dujardiniNH90
| |--H. oberhaeuseriNH90
| `--H. pallidusNH90
`--Isohypsibius Thulin 1928R-M86
|--I. augustiR-M86
|--I. deconincki Pilato 1971R-M86
|--I. deflexus Mihelcic 1960R-M86
|--I. elegans (Binda & Pilato 1971)RS04
|--I. franziNH90
|--I. granuliferR-M86
|--I. itoi Tsurusaki 1980R-M86
|--I. matici Pilato 1971R-M86
|--I. prosostomusNH90
|--I. saltursus Schuster et al. 1977R-M86
|--I. saracenus Pilato 1973R-M86
|--I. stenostomus (Richters 1908)R-M86
|--I. stephaniae Pilato 1974R-M86
|--I. tetradactyloidesR-M86
|--I. tuberculatusNH90
`--I. tuberculoidesNH90
*Type species of generic name indicated
References
[KF00] Kristensen, R. M., & P. Funch. 2000. Micrognathozoa: A new class with complicated jaws like those of Rotifera and Gnathostomulida. Journal of Morphology 246: 1–49.
[NH90] Nelson, D. R., & R. P. Higgins. 1990. Tardigrada. In: Dindal, D. L. (ed.) Soil Biology Guide pp. 393–419. John Wiley & Sones: New York.
[RS04] Regier, J. C., J. W. Shultz, R. E. Kambic & D. R. Nelson. 2004. Robust support for tardigrade clades and their ages from three protein-coding nuclear genes. Invertebrate Biology 123 (2): 93–100.
[R-M86] Renaud-Mornant, J. 1986. Tardigrada. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 254–262. E. J. Brill/Dr W. Backhuys: Leiden.