Depressorotunda gen. nov., a new remarkable Uropodina mite genus from South-East Asia with description of four new species (Acari: Mesostigmata) Author Kontschán, Jen ỏ text Journal of Natural History 2010 2010-05-24 44 23 - 24 1461 1473 http://dx.doi.org/10.1080/00222931003678784 journal article 10.1080/00222931003678784 1464-5262 4652234 Depressorotunda malayana sp. nov. ( Figures 1 , 2 and 3 D–G) Material examined Holotype : female, Malaysia , Selangor , Ulu Kanching Templer Park , soil from forest floor, 27 July 1962 , leg. Nadchatram. Paratype : three males, locality and date same as holotype . The holotype and two paratypes are stored in alcohol ( NHM ). One paratype with gold–palladium coating stored on aluminium stub ( HNHM ) . Description Female. Length of idiosoma 270 µm , width 220 µm . Shape oval, posterior margin rounded. Dorsal idiosoma ( Figure 1A ). All dorsal setae long ( c . 20–32 µm ), wide and setiform, their margins with short hairs ( Figures 1B,C ). Sculptural pattern of dorsal shield lacking. Ventral idiosoma ( Figure 1D ). Tritosternum not clearly visible. Whole surface smooth, without ornamentation. Sternal setae st1 short, smooth and needle-like, other sternal setae broken at their bases. Genital shield linguliform, with triangular anterior process. Ventral cavity large, almost horseshoe-like, anterior margin near the basis of genital shield, posterior margin reaches the anus. Position of ventral setae are as follows: V1 ( c . 24 µm ) placed near the basis of the genital shield in the ventral cavity. V2 ( c . 38 µm ), V3 ( c . 36 µm ) and V4 ( c . 35 µm ) can be found on the lateral margins of the ventral cavity. All of ventral setae long, smooth and setiform. Stigmata situated at the level between coxae II and III. Peritremes hook-shaped. Gnathosoma. Not clearly visible (covered by coxae I). Male. Length of idiosoma 240–260 µm , width 210–220 µm ( n = 3). Shape oval, posterior margin rounded. Dorsal idiosoma. Surface and chaetotaxy of dorsal shield as for the female ( Figure 3D ). Figure 1. Depressorotunda malayana sp. nov. , female. (A) Dorsal idiosoma; (B) marginal dorsal setae; (C) medial dorsal setae; (D) ventral idiosoma. Scale bars: 100 µm (a), 50 µm (b). Ventral idiosoma ( Figures 2A and 3E,F ). Sternal shield without ornamentation. Sternal setae smooth, short ( 4–6 µm ) and needle-like. Ventral setae similar to those of the female. Ventral cavity large, its anterior margin can be found near the anterior margin of sternal shield, posterior margin same as that of the female. Genital shield circular, situated almost between coxae IV and placed in the ventral cavity ( Figures 2A and 3E,F ). All legs with a pair of ambulacral claws and with smooth simple setae ( Figure 3G ). Tritosternum ( Figure 2C ) with narrow basis and trifurcate lacinia. Gnathosoma ( Figure 2B ). Internal malae long and serrate marginally. Hypostomal setae h1 long ( c . 35 µm ), smooth, setiform; h2 short ( c . 8 µm ), smooth and setiform; h3 ( c . 16 µm ) longer than h2 but shorter than h1, setiform, with serrated margin; h4 as long as h2, setiform ( c . 10 µm ), with serrated margins. Epistome with serrated margin, apical part bears short hairs. Palp with smooth and simple setae, but trochanter bears one large seta; this seta with small submedial denticle on each lateral margin. Chelicerae not clearly visible, fixed digit longer than movable digit ( Figure 2B ). Figure 2. Depressorotunda malayana sp. nov. , male. (A) Ventral idiosoma; (B) ventral view of gnathosoma and terminal digits of chelicerae; (C) tritosternum. Scale bars: 100 µm (a), 50 µm (b). Nymphs and larvae. Unknown. Etymology The name malayana refers to its country ( Malaysia ) of origin.