New faunistic and taxonomic data on oribatid mites (Acari: Oribatida) of Malaysia

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ORIGINAL ARTICLE

New faunistic and taxonomic data on oribatid mites (Acari: Oribatida) of Malaysia Sergey G. Ermilov 1 & Stanislav Kalúz 2 Received: 23 September 2019 / Accepted: 22 December 2019 # Institute of Zoology, Slovak Academy of Sciences 2020

Abstract Two new species of oribatid mites (Oribatida) of the genera Arcoppia Hammer, 1977 (Oppiidae) and Oxyamerus Aoki, 1965 (Oxyameridae) are described from Malaysia. Arcoppia malaysiaensis sp. n. differs from Arcoppia kaindicola by smaller body size and by the presence of long, blunt-ended interlamellar setae, well-developed notogastral setae c and long notogastral setae lm. Oxyamerus niedbalai sp. n. differs from all species of Oxyamerus by the presence of long and thick notogastral setae c. Twenty three oribatid species are recorded in Malaysia for the first time. Keywords Mites . Fauna . Morphology . Systematics . Arcoppia . Oxyamerus . Oriental region

Introduction The oribatid mite (Acari: Oribatida) fauna of Malaysia is insufficiently studied (e.g., Aoki 1976; Mahunka 1987, 1995, 2000; Ermilov 2016). Our work is based on a random set of Malaysian oribatid material, which was received from the collection of the Institute of Zoology (Slovak Academy of Sciences, Bratislava, Slovakia). The primary goal of the paper is to describe and illustrate two new species belonging to the genera Arcoppia Hammer, 1977 (Oppiidae) and Oxyamerus Aoki, 1965 (Oxyameridae). The genus Arcoppia was proposed by Hammer (1977) with Arcoppia brachyramosa Hammer, 1977 as type species. It comprises 59 species and nine subspecies, which are distributed in the tropics and subtropics (Subías 2004, updated 2019). The generic characters were summarized by Hammer (1977) and Rodríguez and Subías (1984). The genus Oxyamerus was proposed by Aoki (1965) with Oxyamerus spathulatus Aoki, 1965 as type species. It comprises nine

* Sergey G. Ermilov [email protected] Stanislav Kalúz [email protected] 1

Tyumen State University, Semakova 6, 625003 Tyumen, Russia

2

Institute of Zoology, Slovak Academy of Sciences, Dúbravská cesta 9, 845 06 Bratislava, Slovakia

species, which are distributed in the Australasian and Oriental regions and Japan (Subías 2004, updated 2019). The generic characters were summarized by Ermilov and Corpuz-Raros (2017). The secondary goal of the paper is to present a list of new faunistic oribatid mite findings for Malaysia.

Material and methods This work is based on Malaysian oribatid mite material, which was received from the collection of the Institute of Zoology (Slovak Academy of Sciences, Bratislava, Slovakia). Material examined: Malaysia, Perak District, 50 km NE to Gerik, Titiwangsa, 05°36′17.4″ N, 101°32′34.0″ E, altitude 1100 m a.s.l., forest complex Belum–Temenggor, litter, 30.III–13.IV.2015 (E. Jendek, O. Šauša). All species (except holotypes) are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia (in ethanol with a drop of glycerol). Specimens were mounted in lactic acid on temporary cavity slides for measure