The oribatid mite subgenus Galumna (Cosmogalumna) comprises five species. We describe here a species Galumna (Cosmogalumna) tenensis n. sp. collected from northwestern Vietnam. The new species is similar in polygonal networks of notogaster and pteromorphae to Galumna (Cosmogalumna) yonaguniensis Aoki, 2009 and Galumna (Cosmogalumna) hiroyoshii (Nakamura and Fujikawa, 2004), but differs from the first species by body size, length of rostral setae, morphology of prodorsal integument, and morphology of sensilli; and differs from the second species by body size, shape of rostrum, location of lamellar and rostral setae, and development of interlamellar setae. A diagnostic key to all known species of Galumna (Cosmogalumna) is presented.
A study on the microarthropod community with special reference to species diversity of Oribatid and Collembola communities (Microarthropoda: Oribatei and Collembola) in Tam Dao National Park of Vietnam, a subtropical evergreen broad leaf alpine forest, was undertaken with the aim to explain how they are related to forest decline, and whether they can be used as bioindicators of forest plant succession. The results have shown that microarthropod community structures, particularly species diversity of oribatid and collembolan communities, are related to forest decline. Therefore they can be used as bioindicators of forest plant succession. In Tam Dao National Park, there was an inverse relation between species diversity of the oribatid and Collembola communities. The species diversity of the oribatid community gradually decreased with forest decline whereas the species diversity of the Collembola community gradually increased.
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