Resolving the systematics of Richtersiidae by multilocus phylogeny and an integrative redescription of the nominal species for the genus Crenubiotus (Tardigrada)
Stec, D., Vecchi, M., Maciejowski, W., & Michalczyk, Ł. (2020). Resolving the systematics of Richtersiidae by multilocus phylogeny and an integrative redescription of the nominal species for the genus Crenubiotus (Tardigrada). Scientific Reports, 10, Article 19418. https://doi.org/10.1038/s41598-020-75962-1
Published inScientific Reports
© The Author(s) 2020
The family Richtersiidae, although established recently with the use of phylogenetic methods, was considered potentially paraphyletic at the time of its erection. Until now, the family comprised four genera, Richtersius, Diaforobiotus, Adorybiotus and a newly erected genus Crenubiotus. However, the genetic characterisation for the latter two genera was very limited or absent. To address concerns about the phylogenetic affinity of these two genera, we present a multilocus phylogeny of the families Richtersiidae and Murrayidae based on four molecular markers (18S rRNA, 28S rRNA, ITS-2 and COI). Our results show a distinct evolutionary lineage composed of Adorybiotus and Crenubiotus, which is sister to Murrayidae. In order to accommodate the phylogenetic and morphological distinctiveness of this lineage, we erect a new family, Adorybiotidae fam. nov. The new taxon differs morphologically from other families in the superfamily Macrobiotoidea by a unique combination of traits: (1) the presence of tubercles/cushions with aggregations of microgranules on their surfaces present on all legs and on the dorso-caudal cuticle, (2) a system of internal septa in claws, and (3) buccal apparatus morphology. Moreover, in order to stabilise the taxonomy and nomenclature in the genus Crenubiotus, we redescribe its type species, Crenubiotus crenulatus, by means of integrative taxonomy and designate a new neotype based on a population from the original terra typica. ...
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Additional information about fundingThe Jagiellonian University expedition in 2016 constituted the main party in the project “Southeastern Spitsbergen landscape-seascape and biodiversity dynamics under current climate warming”, which was funded by the Prince Albert II of Monaco Foundation (www.fpa2.org). However, the published results of this expedition are the sole responsibility of Jagiellonian University and under no circumstances can be regarded as reflecting the position of the Prince Albert II of the Monaco Foundation. Sample IT.338 was collected under sampling permit Protocol N.1128 by Parco Nazionale Appennino Tosco-Emiliano (Italy) issued to MV. The sampling in Celebes was supported by the Polish Ministry of Science and Higher Education via the Diamond Grant (DI2015 014945 to Piotr Gąsiorek, supervised by ŁM). We are also grateful to anonymous reviewers who improved the manuscript. The 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 partially supported by supported by the Jagiellonian University (subsidy no. DS/D/WB/IZiBB/16/2019 awarded to DS). During this study, DS was a beneficiary of a National Science Centre scholarship to support doctoral research (No. 2019/32/T/NZ8/00348). Some of the analyses were carried out with the equipment purchased from the Sonata Bis programme of the Polish National Science Centre (Grant No. 2016/22/E/NZ8/00417 to ŁM). Open-access publication of this article was funded by the BioS Priority Research Area under the program “Excellence Initiative – Research University” at the Jagiellonian University in Kraków, Poland. ...
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