Calohypsibius Thulin, 1928

Gąsiorek, Piotr, Morek, Witold, Stec, Daniel, Blagden, Brian & Michalczyk, Łukasz, 2019, Revisiting Calohypsibiidae and Microhypsibiidae: Fractonotus Pilato, 1998 and its phylogenetic position within Isohypsibiidae (Eutardigrada: Parachela), Zoosystema 41 (6), pp. 71-89 : 83

Genus Calohypsibius Thulin, 1928

Calohypsibius Thulin, 1928: 238 .

DIAGNOSIS. — Same as for the family Calohypsibiidae .

ETYMOLOGY (NOT PROVIDED IN THE ORIGINAL DESCRIPTION). — After Schuster et al. (1980), from Ancient Greek κά^ος (kállos) = beauty; derivatives calli-, callo- mean beautiful, pretty. Thulin most likely wanted to highlight the cuticular sculpturing, which is exceptionally complex, rich and unusual among Eutardigrada.

COMPOSITION AND REMARKS

Currently only three species, namely C. maliki Michalczyk & Kaczmarek, 2005 ( Fig. 4B ), C. ornatus ( Richters, 1900) (type species; Figs 3C, D , 4A ), and C. schusteri Nelson & McGlothlin, 1996 ( Fig. 4C ), are ascribed to the family. Nevertheless, Bartoš (1940) already described the remarkable variability within European records of the ornatus complex, which raises justifiable concerns as to whether C. ornatus encompasses only a single species. Further, as suggested by Pilato (1998), it is very likely that the genus comprises many more species than currently recognised. However, a systematic integrative study based on extensive sampling is needed to verify this hypothesis.

Figures

FIG. 4. — Genus Calohypsibius Thulin,1928 s.s., after exclusion of F.verrucosus n. comb. (PCM): A, Calohypsibius ornatus (Richters, 1900); B, Calohypsibius maliki Michalczyk & Kaczmarek, 2005; C, Calohypsibius schusteri Nelson & McGlothlin, 1996. Scale bars: 10 μm.

FIG. 3. — Fractonotus verrucosus (Richters, 1900) n. comb., habitus (SEM): A, lateral view; B, dorsal view; Calohypsibius ornatus (Richters, 1900), habitus (SEM): C, lateral view; D, dorsal view. Scale bars: A, 30 μm; B-D, 20 μm.