Abstract
To date, 34 tardigrade taxa have been recorded from Vietnam and this includes only two macrobiotid species belonging to the genus Mesobiotus. In this paper, two additional species of this genus, one of the M. harmsworthi group and one of the M. furciger group, are reported and described as new for science (Mesobiotus imperialis sp. nov., Mesobiotus marmoreus sp. nov.). Both descriptions have an integrative character providing detailed morphological and morphometric data collected by phase contrast and scanning electron microscopy that are linked to genetic data. The latter constitute DNA sequences of molecular markers that are commonly used in tardigrade taxonomy. The genus phylogeny is also provided, elucidating the phylogenetic position of the newly discovered taxa.
Highlights
Macrobiotidae) from Vietnam.Tardigrades, known as water bears, are a phylum of microscopic animals whose body size usually does not exceed 1 mm
The genus Mesobiotus was founded five years ago by Vecchi et al [5] based on morphological distinctions from other genera within Macrobiotidae
The new species belong to the informal Mesobiotus harmsworthi morphogroup as it exhibits rather large conical processes
Summary
Macrobiotidae) from Vietnam.Tardigrades, known as water bears, are a phylum of microscopic animals whose body size usually does not exceed 1 mm. The composition was further supported by phylogenetic analyses confirming the newly proposed taxon to be monophyletic [5] and, as such, was recovered in the recent phylogeny of the family
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