Weglarskobius, Kaczmarek & Bartylak & Roszkowska, 2020

Kaczmarek, Łukasz, Bartylak, Tomasz & Roszkowska, Milena, 2020, Two new genera of long clawed Isohypsibioidea Guil, Jørgensen & Kristensen, 2019, Zootaxa 4729 (2), pp. 293-299 : 296-297

Genus: Weglarskobius gen. nov.

( Figs 1 , 6–9 )

Genus abbreviation: Weg.

Type species: Weglarskobius altai comb. nov. ( Kaczmarek & Michalczyk, 2006a)

Etymology: The genus name is dedicated to famous Polish tardigradologist Barbara Węglarska, who donated to the first author, the microscope slides from Mongolia on which the specimens of Iso. altai were found.

Diagnosis: Legs short and robust. Internal and external claws on legs I–III different in size and shape. Internal claws I–III similar to Isohypsibius type, but with long basal part (as in the genus Thulinius Bertolani, 2003 ), and lacking accessory points (or not visible under light microscopy). External claws I–III same as on legs IV. Internal and external claws of legs IV similar in length and shape, however in comparison with typical Isohypsibius- like claws they have extremely long primary branches (more than twice the length of the secondary branches) and without accessory points (or not visible in light microscopy). Cuticle smooth. Bucco-pharyngeal apparatus of the Isohypsi- bius type, Isohypsibius variant. Peribuccal lamellae and oral cavity armature absent. Lobes around mouth opening need to be confirmed, as well as the shape of the stylet furcae and apophyses for the insertion of the stylet muscles (AISM). Macroplacoids and microplacoid present. Lunules and pseudolunulae absent. Cuticular bars on legs I–III present near the base of the claw. Eggs unknown.

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Remarks: In the original description of Weglarskobius altai comb. nov. ( Kaczmarek & Michalczyk, 2006a), it was stated that two macroplacoids are present in the pharynx. After re-examining specimens of this species we think that more correctly we should consider the presence of three macroplacoids, with first two macroplacoids situated very close to each other ( Fig. 7 ).

Composition: Weglarskobius altai comb. nov. ( Kaczmarek & Michalczyk, 2006a)

Figures

FIGURE 1. A schematic illustration of the claws of Vlamidirobius gen. nov., Weglarskobius gen. nov. and Isohyp- sibius Thulin, 1928 (according to Pilato & Binda 2010, modified).

FIGURES 6–7. Weglarskobius altai comb. nov.: 6—dorso-ventral assembled image of the entire animal (paratype); 7—bucco-pharyngeal apparatus (paratype). All PCM. Scale bars in µm.

FIGURES 8–9. Weglarskobius altai comb. nov.: 8—claws of leg I (paratype); 9—claws of leg IV (paratype). All PCM. Scale bars in µm