Taxonomic study of oribatid mites (Acari, Oribatida) of Bi Dup — Nui Ba National Park (southern Vietnam) Author Ermilov, Sergey G. Author Anichkin, Alexander E. text Zootaxa 2014 3834 1 1 86 journal article 36818 10.11646/zootaxa.3834.1.1 dca46b01-3cfa-434a-aeab-fcde01cebb9d 1175-5326 286642 82E287A1-C51B-4196-8C53-FB3BA2CE6899 Epieremulus bidupensis sp. nov. ( Figures 15–18 ) With characters of the genus Epieremulus Berlese, 1916 as summarized by Balogh & Balogh (1988 , 1992 ). Diagnosis. Body size 332–365 × 182–215. Body covered with granular cerotegument. Two pairs of subcostular ridges straight, longitudinally oriented. Rostral setae setiform, thin, slightly barbed; lamellar setae setiform, thickened, ciliate; interlamellar setae dilated medio-distally, with strong barbs. Bothridial setae clavate, with strong cilia. Anterior part of notogaster with two short ridges. Ten pairs of notogastral setae of medium size, dilated medio-distally, with strong, dense barbs. Monodactylous. Description. Measurements . Body length 348 ( holotype : female), 332–365 (five paratypes : three females and two males); body width 199 ( holotype ), 182–215 (five paratypes ). Integument . Body color light brownish. Body covered by with granular cerotegument; granules rounded (their diameter up to 4). Body surface smooth. Prodorsum . Rostrum widely rounded. Costulae and two pairs of subcostular ridges ( r 1, r 2) long, well developed, longitudinally oriented, parallel. Rostral setae (16–20) setiform, thin, slightly barbed. Lamellar setae (45–49) setiform, thickened, ciliate unilaterally, inserted on tubercle nearly to costular end. Interlamellar setae (12–16) dilated medio-distally, with strong, dense barbs. Bothridial setae (49–57) clavate, with strong cilia. Interbothridial tubercles rounded, located separately. Exobothridial setae (8–10) setiform, straight, thin, smooth. Pair of small, round-blunted postbothridial tubercles weakly developed. Notogaster . Anterior notogastral margin straight. Pair of large triangular humeral tubercles developed, directed towards the postbothridial tubercles. Anterior part of notogaster with two short longitudinal sclerotized ridges. Ten pairs of notogastral setae dilated medio-distally, with strong, dense barbs: p 1, p 2, p 3 (12–20) shorter than others (24–28). Lyrifissures and opisthonotal gland openings distinctly visible. Gnathosoma . Subcapitulum longer than wide (77–82 × 61). Subcapitular setae setiform, smooth; h (16) longer than a 12) and m (6). Adoral setae absent. Palps (49–53) with setation 0–2–1–1–8(+ω). Solenidion shorter than half of palptarsus length, straight, thickened, blunt-ended, pressed to surface of palptarsus, not attached to eupathidium. Chelicerae (77–82) with two setiform, slightly barbed setae; cha (20–22) longer than chb (16–18). Trägårdh’s organ distinct. Epimeral and lateral podosomal regions . Apodemes (1, 2, sejugal, 4) well visible. Epimeral setal formula 3–1–3–3. All setae setiform, thin, smooth; 1a , 1c , 2a , 3a , 4a , 4b , 4c (12–16) shorter than 3b , 3c (16–24) and 1b (26–32). Discidia triangular, widely rounded. Anogenital region . Six pairs of genital ( g 1, 12, g 2– g 6, 6–8), one pair of aggenital (4), two pairs of anal (8–10) and three pairs of adanal ( ad 1, ad 2, 16–20; ad 3, 4–6) setae setiform, smooth. Lyrifissures iad in inverse apoanal position. Setae ad 3 inserted posteriorly to iad . FIGURE 15 . Epieremulus bidupensis sp. nov. , adult: A—dorsal view; B—lateral view of prodorsum and anterior part of notogaster (gnathosoma and legs I, II not illustrated). Scale bar (A) 100 Μm; scale bar (B) 50 Μm. FIGURE 16 . Epieremulus bidupensis sp. nov. , adult: A—ventral view (gnathosoma and legs not illustrated); B—posterior view of notogaster. Scale bar (A) 100 Μm; scale bar (B) 50 Μm. FIGURE 17 . Epieremulus bidupensis sp. nov. , adult: A—rostral seta; B—lamellar seta; C—interlamellar seta; D—bothridial seta; E—exobothridial seta; F—notogastral seta h 2, G—subcapitulum, right half, ventral view; H—palp; I—chelicera; J—part of epimeral region with setae 1a , 1b ; K—part of epimeral region with epimeral tubercles and setae 3b , 3c ; L—genital plate, left; M—anal plate, left, and adanal setae. Scale bar (A–F, H) 10 Μm; scale bar (G, I–M) 20 Μm. FIGURE 18 . Epieremulus bidupensis sp. nov. , adult: A—leg I, right, paraxial view; B—leg IV, right, paraxial view. Scale bar (A, B) 20 Μm; scale bar (C, D) 20 Μm.

Legs . Monodactylous;	claws smooth. Formulae of leg setation	and solenidia: I (1–5–3–4–17) [1–2–2], II
(1–5–3–4–15) [1–1–2], III	(2–3–2–3–15) [1–1–0], IV (1–2–3–3–12)	[0–1–0]; homologies of setae and solenidia
indicated in Table 6.

TABLE 6 . Leg setation and solenidia of Epieremulus bidupensis sp. nov.

Leg	Trochanter	Femur	Genu	Tibia	Tarsus
I	v'	d, (l), v'', bv''	(l), v', σ	(l), (v), φ1, φ2	(ft), (tc), (it), (p), (u), (a), s, (pv), pl', e, ω1, ω2
II	v'	d, (l), v'', bv''	(l), v', σ	(l), (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω2
III	l', v'	d, l', ev'	l', v', σ	l', (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv)
IV	v'	d, ev'	d, l', v'	l', (v), φ	ft'', (tc), (p), (u), (a), s, (pv)

See Table 2 for explanations. Type material. Collection data for holotype (female): locality 1 (litter); collection data for five paratypes (three females and two males): locality 2 (litter). Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia ; four paratypes are deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia ; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia . Etymology. The specific name “ bidupensis ” refers to the Vietnamese park origin, Bi Dup—Nui Ba National Park. Remarks. The genus Epieremulus comprises 10 species, having a cosmopolitan distribution except Antarctic region (data summarized by Subías 2004 , updated 2014). In having the two short notogastral ridges, absence of transcostula and localization and morphology of ventral setae, Epieremulus bidupensis sp. nov. is most similar to Epieremulus granulatus granulatus ( Balogh & Mahunka, 1979 ) from the Neotropical region. However, it clearly differs from the latter by the monodactylous legs (versus tridactylous in E. granulatus granulatus ), setiform lamellar setae (versus thick in E. granulatus granulatus ), smooth adanal setae (versus barbed in E. granulatus granulatus ) and roundly blunted interbothridial tubercles (versus rectangular in E. granulatus granulatus ).