Integrative taxonomy resolves species identities within the Macrobiotus pallarii complex (Eutardigrada: Macrobiotidae)
Stec, D., Vecchi, M., Dudziak, M., Bartels, P. J., Calhim, S., & Michalczyk, Ł. (2021). Integrative taxonomy resolves species identities within the Macrobiotus pallarii complex (Eutardigrada: Macrobiotidae). Zoological Letters, 7, Article 9. https://doi.org/10.1186/s40851-021-00176-w
Published inZoological Letters
© The Author(s). 2021
The taxonomy of many groups of meiofauna is challenging due to their low number of diagnostic morphological characters and their small body size. Therefore, with the advent of molecular techniques that provide a new source of traits, many cryptic species have started to be discovered. Tardigrades are not an exception, and many once thought to be cosmopolitan taxa are being found to be complexes of phenotypically similar species. Macrobiotus pallarii Maucci, 1954 was originally described in South Italy and has been subsequently recorded in Europe, America, and Asia. This allegedly wide geographic range suggests that multiple species may be hidden under this name. Moreover, recently, genetic evidence to support this was put forward, and the Macrobiotus pallarii complex has been proposed to accommodate putative species related to M. pallarii. Here, we describe three new pseudocryptic species based on populations that would have been all classified as Macrobiotus pallarii if molecular methods were not employed. Using an integrative taxonomy approach, we analyzed animals and eggs from the topotypic population of Macrobiotus pallarii, together with four other populations of the complex. We recovered four distinct phylogenetic lineages that, despite the overlap of morphometric traits, can be separated phenotypically by subtle but discrete morphological characters. One lineage corresponds to Macrobiotus pallarii, whereas the other three are newly described as Macrobiotus margoae Stec, Vecchi & Bartels, sp. nov. from the USA, Macrobiotus ripperi Stec, Vecchi & Michalczyk, sp. nov. from Poland and Finland, and Macrobiotus pseudopallarii Stec, Vecchi & Michalczyk, sp. nov. from Montenegro. To facilitate species identification, we provide a dichotomous key for species of the M. pallarii complex. Delimitation of these pseudocryptic taxa highlights the need for an integrative approach to uncover the phylum’s diversity in full. ...
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Related funder(s)Academy of Finland
Funding program(s)Research costs of Academy Research Fellow, AoF
Additional information about fundingThe study was supported by the Preludium programme of the Polish National Science Centre (grant no. 2018/31/N/NZ8/03096 to DS, supervised by ŁM) and by the European Commission’s (FP 6) Integrated Infrastructure Initiative SYNTHESYS (grant no. DK-TAF-4387 to ŁM). Some of the analyses were carried out with equipment purchased from the Sonata Bis programme of the Polish National Science Centre (grant no. 2016/22/E/NZ8/00417 to ŁM). During this study, DS was a beneficiary of a National Science Centre scholarship to support doctoral research (no. 2019/32/T/NZ8/00348). SC and MV are funded by the Academy of Finland (Fellowship #314219 to SC). Open-access publication of this article was funded by the BioS Priority Research Area under the program “Excellence Initiative – Research University” at Jagiellonian University in Kraków, Poland. ...
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