Abstract
The taxonomy of Micronectidae in Vietnam is reviewed. Based on our cumulative collections during 2001–2020, 11 new species of Micronecta Kirkaldy, 1897 are documented and described in this study: M. acuminata sp. nov., M. arcuata sp. nov., M. caperata sp. nov., M. clavata sp. nov., M. cultellata sp. nov., M. fulvopicta sp. nov., M. nieseri sp. nov., M. pingae sp. nov., M. sinuata sp. nov., M. undulata sp. nov., and M. vietnamica sp. nov. Nine species are recorded from Vietnam for the first time: M. decorata Lundblad, 1933, M. drepani Nieser, 2000, M. erythra Nieser, Chen & Yang, 2005, M. fugitans Breddin, 1905, M. johorensis Fernando, 1964, M. melanochroa Nieser, Chen & Yang, 2005, M. ornitheia Nieser, Chen & Yang, 2005, M. sahlbergi (Jakovlev, 1881), and M. tuwanoni Nieser, Chen, Leksawasdi, Thanyakam & Duangsupa, 2004. Thus, in this study, two genera and 37 species of Micronectidae are now reported from Vietnam: Synaptonecta Lundblad, 1933 with only one species, S. issa (Distant, 1910), and Micronecta with 36 species. A key to all species occurring in Vietnam, subgeneric diagnoses, and a key to all current subgenera of Micronecta are provided.
Highlights
Species of Micronectidae Jaczewski, 1924 (Heteroptera Latreille, 1810: Nepomorpha Popov, 1968) are water bugs, with small body sizes and oar-like hind legs; they are commonly referred to as pygmy water boatmen
Micronectidae belongs to the superfamily Corixoidea Leach, 1815, which consists of three families, Corixidae Leach, 1815, Micronectidae, and Diaprepocoridae Lundblad, 1928
When measurements are not given as a range, they refer to the holotype or a randomly selected specimen
Summary
Species of Micronectidae Jaczewski, 1924 (Heteroptera Latreille, 1810: Nepomorpha Popov, 1968) are water bugs, with small body sizes (length 0.8–5.0 mm) and oar-like hind legs; they are commonly referred to as pygmy water boatmen. Most species inhabit standing waters, especially at the bottoms of shallow ponds and lakes, or in vegetation bordering flowing water bodies They are freshwater, some common species, such as Micronecta quadristrigata Breddin, 1905 and M. lundibunda Breddin, 1905, are found in brackish waters Recent molecular phylogenetic analyses of Nepomorpha, which included several ingroup taxa of Corixidae, Micronectidae and Diaprepocoridae, support that each family forms a distinct clade, and the superfamily Corixoidea is monophyletic (see Ye et al 2019; Wang et al 2020). Considering these phylogenetic analyses and distinct morphological characteristics, we adopt the idea to classify Corixidae, Micronectidae, and Diaprepocoridae at family level
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