Indoribates (Indoribates) bicarinatus, Ermilov, Sergey G. & Anichkin, Alexander E., 2014

Ermilov, Sergey G. & Anichkin, Alexander E., 2014, Taxonomic study of oribatid mites (Acari, Oribatida) of Bi Dup — Nui Ba National Park (southern Vietnam), Zootaxa 3834 (1), pp. 1-86 : 51-56

Indoribates (Indoribates) bicarinatus sp. nov.

( Figures 34–37 )

With characters of the subgenus Indoribates (Indoribates) Jacot, 1929 as summarized by Balogh & Balogh (1992), Mahunka (1977) for Nixozetes and Hammer (1979) for Sundazetes .

Diagnosis. Body size 564–647 × 348–448. Body surface microfoveolate. Prodorsal and adanal setae setiform. Ten pairs of notogastral setae of medium size, setiform, smooth. Three pairs of aggenital setae present. Anal plates with longitudinal ridge.

Description. Measurements. Body length 597 (holotype: female), 564–647 (three paratypes: two females and one male); body width 398 (holotype), 348–448 (three paratypes).

Integument. Body color light brown. Body surface microfoveolate, visible under high magnification in dissected specimens (diameter of foveolae less than 1). Anal plates with longitudinal ridge.

Prodorsum. Rostrum widely rounded. Lamellae about 1/2 of length of prodorsum. Rostral (73–82) and lamellar (106–114) setae setiform, barbed. Interlamellar setae (102–110) setiform, indistinctly barbed. Bothridial setae (127–139) setiform, densely ciliate unilaterally. Exobothridial setae (16–20) thin, slightly barbed. Tutoria long, with tooth distally, fused part reaching insertion of rostral setae. Sublamellar lines distinct. Sublamellar porose areas (Al) rounded.

Notogaster. Anterior notogastral margin well developed, convex medially. Dorsophragmata of medium size, elongate. Ten pairs of notogastral setae of medium size (c 1, la, 65–77; others 45–49), setiform, smooth. Four pairs of sacculi elongate, sometimes S2 triangular. Opisthonotal gland openings located laterally to lp.

Gnathosoma. Subcapitulum longer than wide (155 × 110). Subcapitular setae setiform, slightly barbed; m (32–41) longer than a and h (24–32). Adoral setae not studied. Palps (73) with setation 0–2–1–3–9(+ω). Solenidion little longer than half of palptarsus length, straight, thickened, weakly dilated distally, attached to eupathidium. Chelicerae (196) with two barbed setae; cha (57) longer than chb (32). Trägårdh’s organ (not illustrated) distinct.

Epimeral and lateral podosomal regions. Apodemes (1, 2, sejugal, 3) well visible. Epimeral setal formula: 3–1–3–3. All setae setiform, thin, smooth. Setae 1b (28) longer than others (12–16). Discidia triangular, blunted. Circumpedal carinae distinct.

Anogenital region. Five pairs of genital (g 1, 12–16; g 2– g 5, 8–12), three pairs of aggenital (8–12), two pairs of anal (20–28) and three pairs of adanal (ad 1, ad 2, 41–45, ad 3, 20–28) setae setiform, smooth. Adanal setae ad 3 inserted anteriorly to lyrifissures iad. Ovipositor elongate (241 × 57); length of lobes 106, length of cylindrical distal part 135. Each lobe with four thin, smooth setae: ψ1 ≈ τ1 (45) longer than ψ2 ≈ τ a ≈ τ b ≈ τ c (24). Coronal setae absent.

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), v', (pl), l'', e, ω1, ω 2 II v' d, l'1, l'2, v'', bv'' (l), v', σ (l), (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω 2 III l', v' d, l', ev' l', σ l', (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv) IV v' d, ev' d, l' l', (v), φ ft'', (tc), (p), (u), (a), s, (pv)

See Table 2 for explanations.

Type material. Collection data for holotype (female): locality 4 (soil); collection data for three paratypes (two females and one male): locality 4 (litter).

Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; two 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 “ bicarinatus ” refers to the longitudinal ridges on anal plates.

Remarks. The subgenus Indoribates (Indoribates) comprises 10 species, which are distributed in the Australian, Oriental and southern Palaearctic regions (data summarized by Subías 2004, updated 2014).

In having the setiform prodorsal and adanal setae and microfoveolate/micropunctate body surface, Indoribates (Indoribates) bicarinatus sp. nov. is most similar to Indoribates (Indoribates) microsetosus Ermilov & Anichkin, 2011 (b) from Vietnam. However, it clearly differs from the latter by the presence of notogastral setae of medium size (versus microsetae in I. (I.) microsetosus ), three pairs of aggenital setae (versus one pair in I. (I.) microsetosus ) and longitudinal ridge on the each anal plate (versus absent in I. (I.) microsetosus ).

Figures

FIGURE 34. Indoribates (Indoribates) bicarinatus sp. nov., adult: A—dorsal view; B—lateral view of prodorsum and anterior part of notogaster (legs I, II not illustrated). Scale bar 200 Μm.

FIGURE 35. Indoribates (Indoribates) bicarinatus sp. nov., adult: A—ventral view (gnathosoma and legs not illustrated); B—posterior view. Scale bar 200 Μm.

FIGURE 36. Indoribates (Indoribates) bicarinatus sp. nov., adult: A—lamellar seta; B—bohridial seta; C—pteromorph; D—saccule Sa; E—saccule S 1; F—saccule S 2; G—saccule S 3; H—subcapitulum, left half, ventral view; I—palptarsus; J—chelicera (Trägårdh’s organ not illustrated); K—pedotectum II, discidium and epimaral setae 3 b, 3 c, 4 c; L—genital plate, left; M—anal plate, left, and adanal setae ad 1, ad 3; N—ovipositor. Scale bar (A, B, D, L, M) 20 Μm; scale bar (C, H, J, N) 50 Μm, scale bar (D – G, I, K) 10 Μm.

FIGURE 37. Indoribates (Indoribates) bicarinatus sp. nov., adult: A—leg II, without trochanter, left, antiaxial view; B—leg IV, left, antiaxial view. Scale bar 50 Μm.

Tables

TABLE 2. Leg setation and solenidia of Lohmannia (Carolohmannia) monosetosa sp. nov.

Legs. Monodactylous;	claws smooth. Formulae of leg setation	and solenidia: I (1–5–3–4–20) [1–2–2], II
(1–5–3–4–15) [1–1–2], III	(2–3–1–3–15) [1–1–0], IV (1–2–2–3–12)	[0–1–0]; homologies of setae and solenidia
indicated in Table 10.