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The phyletic relationships both between and within many of tardigrade genera have been barely studied and they remain obscure. Amongst them is the cosmopolitan    Bryodelphax   , one of the smallest in terms of body size echiniscid genera. The analysis of newly-found populations and species from the Mediterranean region and from South-East Asia gave us an opportunity to present the first phylogeny of this genus, which showed that phenotypic traits used in classical    Bryodelphax    taxonomy do not correlate with their phyletic relationships. In contrast, geographic distribution of the analysed species suggests their limited dispersal abilities and seems to be a reliable predictor of phylogenetic affinities within the genus. Moreover, we describe three new species of the genus.    Bryodelphax   australasiaticus    sp. nov. , by having the ventral plate configuration VII:4-4-2-4-2-2-1, is a new member of theweglarskae    group with a wide geographic range extending from the Malay Peninsula through the Malay Archipelago to Australia.    Bryodelphax   decoratus    sp. nov.  from Central Sulawesi (Celebes) also belongs to theweglarskae    group (poorly visible ventral plates VII:4-2-2-4-2-2-1) and is closely related to the recently described    Bryodelphax   arenosus    Gąsiorek, 2018, but is differentiated from the latter by well-developed epicuticular granules on the dorsum. Finally, a new dioecious species,    Bryodelphax   nigripunctatus    sp. nov. , is described from Mallorca and, by the reduced ventral armature (II/III:2-2-(1)), it resembles    Bryodelphax   maculatus    Gąsiorek et al., 2017. The latter species, known so far only from northern Africa, is recorded from Europe for the first time. A taxonomic key to the genus members is also presented.

Small is beautiful: the first phylogenetic analysis of Bryodelphax Thulin, 1928 ( Heterotardigrada , Echiniscidae )