Vol. 61, 2022
An Integrative Description of Two New Mesobiotus Species (Tardigrada: Eutardigrada: Macrobiotidae) with Updated Genus Phylogeny
of Systematics and Evolution of Animals, Polish Academy of Sciences,
Sławkowska 17, 31-016 Kraków, Poland. *Correspondence: E-mail:
Received 21 August 2022 / Accepted 15 Oetober 2022
Communicated by Benny K.K. Chan
This work presents two new Mesobiotus
species from the Republic of South Africa, formally described using
integrative analyses. Specimens of the new species are examined in
terms of morphology and morphometry under a contrast phase light
microscope (PCM) and scanning electron microscope (SEM). For both new
species, genetic data in the form of DNA sequences of commonly used
molecular markers are also provided (18S rRNA, 28S rRNA, COI, ITS-2).
Furthermore, such genetic data are also provided for the first time for
(Maucci, 1991) from Greenland. The study also presents a multilocus
molecular phylogeny of the genus and an elaborated discussion on the
taxa groupings and species composition. This results in the
ratification of three informal morpho-groups in order to ease and
improve communication in further taxonomic studies on the genus.
Finally, an updated key to all valid nominal Mesobiotus
taxa (71 species) is provided to enhance species identification in this
morphologically diverse group of limno-terrestrial tardigrades.
Key words: Egg ornamentation, Integrative taxonomy, Mesobiotus diegoi sp. nov., Mesobiotus maklowiczi sp. nov., Tardigrades.
Citation: Stec D. 2022. An integrative description of two new Mesobiotus species (Tardigrada: Eutardigrada: Macrobiotidae) with updated genus phylogeny. Zool Stud 61:85.
materials: SM. 1丨SM. 2丨SM. 3