Hypsibius Ehrenberg 1848

• Main Authors: Zawierucha, Krzysztof, Gąsiorek, Piotr, Buda, Jakub, Uetake, Jun, Janko, Karel, Fontaneto, Diego
• Format: Text
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Tardigrada; Eutardigrada; Parachela; Hypsibiidae; Hypsibius; Midland; Mount Stanley; Tardigrade; water bear
• Online Access: https://dx.doi.org/10.5281/zenodo.5990443; https://zenodo.org/record/5990443

Hypsibius sp. Material. Four individuals (slides number: U/6, U/10, U/11, and U/13) are deposited in the Department of Animal Taxonomy and Ecology at Adam Mickiewicz University, Pozna&nacute;, Poland. Locality. Mount Stanley, Rwenzori Mountains (0°22'31''N, 29°52'40''E; 4790 m asl), Uganda. Diagnosis. Body transparent/white, eyes present in three of the four specimens mounted in Hoyer’s medium (Fig. 5A). Dorsal cuticle sculptured: from head to legs II without delicate thickenings, from legs II to the caudal end of the body thickened, with irregular thickenings that form large wrinkles from legs III to the caudal end (Figs. 5A–C). Thickenings increasing in size from the anterior to the posterior part of the body, reaching maximum dimensions between legs III and IV (Figs. 5A–C). Ventral cuticle smooth. Buccal apparatus short and rigid (Fig. 5D). Teeth in the oral cavity armature absent or not visible under PCM. Pharynx with apophyses and with two rodshaped macroplacoids. Macroplacoid length sequence 2<1. Microplacoid and septulum absent (Fig. 5D). Claws of the scabropygus - type, internal claws much smaller and of a different shape than the external claws (Fig. 5E). All primary branches with accessory points. Smooth, indistinct pseudolunulae under claws more visible on external claws (Fig. 4E). Cuticular bars under claws I–III absent but a small bar is present near the posterior claw IV. Remarks. The potentially new Hypsibius species is similar to H. scabropygus Cuénot, 1929, H. macrocalcaratus Beasley, 1988, H. roanensis Nelson & McGlothlin, 1993, and H. stiliferus Abe, 2004, but it differs from them by the type of cuticular thickenings and folds on the dorsal side. According to the recently suggested optimal sample size for morphometric ranges in taxonomic traits of tardigrades (Stec et al . 2016), we decided not to formally describe Hypsibius sp. as a new species based on only four individuals. Moreover, establishing Hypsibius sp. as a new species without re-descriptions of the other hypsibiids in the H. scabropygus group (e.g. Zawierucha et al . 2014) would not make much sense. Currently the genus Hypsibius consists of 42 species (Degma et al . 2009–2017), but from a molecular and morphological point of view it appears polyphyletic and with cryptic diversity (Dastych et al . 2003; Kiehl et al . 2007). : Published as part of Zawierucha, Krzysztof, Gąsiorek, Piotr, Buda, Jakub, Uetake, Jun, Janko, Karel & Fontaneto, Diego, 2018, Tardigrada and Rotifera from moss microhabitats on a disappearing Ugandan glacier, with the description of a new species of water bear, pp. 311-328 in Zootaxa 4392 (2) on pages 319-321, DOI: 10.11646/zootaxa.4392.2.5, http://zenodo.org/record/1195435 : {"references": ["Cuenot, L. (1929) Description d'un tardigrade nouveau de la faune francaise. Archives d'Anatomie Microscopique et de Morphologie Experimentale, 25, 121 - 125.", "Beasley, C. W. (1988) Altitudinal distribution of Tardigrada of New Mexico with description of a new species. The American Midland Naturalist Journal, 120, 436 - 440. https: // dx. doi. org / 10.2307 / 2426016", "Gasiorek, P., Stec, D., Morek, W., Zawierucha, K., Kaczmarek, L., Lachowska-Cierlik, D. & Michalczyk, L. (2016) An integrative revision of Mesocrista Pilato, 1987 (Tardigrada: Eutardigrada: Hypsibiidae). Journal of Natural History, 50, 2803 - 2828. https: // dx. doi. org / 10.1080 / 00222933.2016.1234654", "Kaczmarek, L., Cytan, J., Zawierucha, K., Diduszko, D. & Michalczyk, L. (2014) Tardigrades from Peru (South America), with descriptions of three new species of Parachela. Zootaxa, 3790 (2), 357 - 379. https: // dx. doi. org / 10.11646 / zootaxa. 3790.2.5", "Dastych, H., Kraus, H. J. & Thaler, K. (2003) Redescription and notes on the biology of the glacier tardigrade Hypsibius klebelsbergi Mihelcic, 1959 (Tardigrada), based on material from Otztal Alps, Austria. Mitteilungen aus den Hamburgischen Zoologischen Museum und Institut, 100, 73 - 100.", "Kiehl, E., Dastych, H., D'Haese, J. & Greven, H. (2007) The 18 S rDNA sequences support polyphyly of the Hypsibiidae (Eutardigrada). Journal of Limnology, 66, 21 - 25. https: // dx. doi. org / 10.4081 / jlimnol. 2007. s 1.21"]}