A new species of Lasiobelba (Acari, Oribatida, Oppiidae) from Vietnam

A new species of oribatid mites of the genus Lasiobelba (Oribatida, Oppiidae) is described from decomposing logs in the polydominant forest of Cat Tien National Park (Southern Vietnam). Lasiobelba longisensilla sp. nov. differs from most similar species, L. sculpta Wang, 1993 and L. yunnanensis Wen, 1999, by the smaller body size, notogaster without sculpturing, and lamellar setae shorter than rostral and interlamellar setae.


Introduction
During taxonomic study of the small oribatid mite material collected from Dong Nai Province in Cat Tien National Park of Southern Vietnam, I found one new species belonging to the genus Lasiobelba Aoki, 1959, the nominative subgenus (Acari, Oribatida, Oppiidae). The main goal of the paper is to describe and illustrate a new species under the name Lasiobelba longisensilla sp. nov.
This work is part of the study on the oribatid fauna of Southern Vietnam (e.g. Ermilov 2015bErmilov , 2016Ermilov , 2017.

Material and Methods
Material: Holotype (male) and three paratypes (one female and two males): Vietnam, Dong Nai Province, Cat Tien National Park, 11°26'48''N, 107°26'26''E, 145 m a.s.l., polydominant forest, sample from the large Methods: Specimens were mounted in lactic acid on temporary cavity slides for measurement and illustration. Body length was measured in lateral view, from the tip of the rostrum to the posterior edge of the ventral plate. Notogastral width refers to the maximum width of notogaster in dorsal view. Lengths of body setae were measured in lateral aspect. All body measurements are presented in micrometers. Formulas for leg setation are given in parentheses according to the sequence trochanter-femur-genu-tibia-tarsus (famulus included). Formulas for leg solenidia are given in square brackets according to the sequence genu-tibiatarsus. Drawings were made with a camera lucida using a Leica transmission light microscope "Leica DM 2500".
The following abbreviations of collections are used: SMNH -Senckenberg Museum of Natural History, Görlitz, Germany; TSUMZ -Tyumen State University Museum of Zoology, Tyumen, Russia.

s, (pv)
Roman letters refer to normal setae, Greek letters refer to solenidia (except ɛfamulus). One apostrophe (') marks setae on anterior and double apostrophe (") setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.
Type deposition. The holotype (in ethanol with drop of glycerol) is deposited in SMNH. Three paratypes (in ethanol with drop of glycerol) are deposited in TSUMZ.