Allosuctobelba vietnamensis, 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 : 21-26

Allosuctobelba vietnamensis sp. nov.

( Figures 11–14 )

With characters of the genus Allosuctobelba Moritz, 1970 as summarized by Moritz (1970), Chinone (2003).

Diagnosis. Body size 282–348 × 166–232. Rostrum bidentate. Lateral sides of rostrum with three blunt teeth. Rostral region with one pair of oval foveolae. Tectopedial fields absent. Rostral setae geniculate, densely ciliate. Lamellar and interlamellar setae setiform, sparsely barbed. Bothridial setae spindleform. A pair of humeral tubercles present. Notogastral setae setiform, smooth, with short flagellate tip. Genital and aggenital setae slightly barbed; anal and adanal setae smooth.

Description. Measurements. Body length 315 (holotype: male), 282–348 (five paratypes: one female and four males); body width 182 (holotype), 166–232 (five paratypes).

Integument. Body color light brownish. Body surface smooth. Dorsal and lateral sides of prodorsum with foveolae, forming a polygonate pattern (length of foveolae up to 8).

Prodorsum. Rostrum bidentate. Lateral sides of rostrum with three teeth: anterior tooth narrowly triangular, others large tubercle-like, round-ended. Rostral region with one pair of oval foveolae (fov, 6–12 × 4–8). Tectopedial fields absent. Rostral setae (24–36) geniculate, densely ciliate unilaterally. Lamellar setae (49–53) setiform, sparsely barbed, inserted on triangular tubercle rounded distally. Interlamellar setae (41–49) setiform, sparsely barbed, inserted in basal part of triangular interbothridial tubercles. Bothridial setae (94–112) spindleform, with long, thin tip, having barbs. Exobothridial setae (24–32) setiform, thin, smooth. A pair of triangular, roundly blunted postbothridial tubercles well visible.

Notogaster. Anterior notogastral margin weakly convex medially. A pair of large, rounded humeral tubercles developed, directed towards the postbothridial tubercles. Ten pairs of notogastral setae setiform, smooth, with short flagellate tip: c, la, lm, lp, h 2, h 3 (73–90) longer than h 1, p 1, p 2, p 3 (53–69). Lyrifissures and opisthonotal gland openings indistinctly visible.

Gnathosoma. Subcapitulum longer than wide (73 × 41–45). Subcapitular setae setiform; h (28) with long cilia unilaterally, little longer than slightly barbed m and smooth a (both 24). Adoral setae absent. Palps (45–49) with setation 0–2–0–2–8(+ω). Solenidion longer than half of palptarsus length, straight, thickened, pressed to the surface of palptarsus, not attached to eupathidium. Chelicerae (61) with one smooth setae cha (20). 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, barbed; 1a, 2a, 3a (20) shorter than others (32–41). Discidia triangular, blunt-ended.

Anogenital region. Six pairs of genital (g 1, 20–28, g 2– g 6, 16–20) and one pair of aggenital (26) setae setiform, slightly barbed. Two pairs of anal (24–32) and three pairs of adanal (ad 1, ad 2, 51–55; ad 3, 45–49) setae setiform, smooth. Distance ag–ag shorter than ad 3– ad 3. Lyrifissures iad short.

Legs. Monodactylous; claws smooth. Formulae of leg setation and solenidia: I (1–5–2–4–20) [1–2–2], II (1–5–2–4–14) [1–1–2], III (2–3–1–3–13) [1–1–0], IV (1–2–2–3–10) [0–1–0]; homologies of setae and solenidia indicated in Table 5 .

Type material. Collection data for holotype (male): locality 3 (soil); collection data for five paratypes (one female and four males): locality 6 (soil).

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; three paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology. The specific name “ vietnamensis ” refers to the country of origin, Vietnam.

See Table 2 for explanations.

Remarks. The genus Allosuctobelba comprises 14 species, which are distributed in the Holarctic, Oriental and Neotropical regions (data summarized by Subías 2004, updated 2014).

In having the spindle-form bothridial setae, absence of tectopedial fields, presence of humeral tubercles and notogastral setae with short flagellate tip, Allosuctobelba vietnamensis sp. nov. is similar to Allosuctobelba tricuspidata tricuspidata Aoki, 1984 (b) (see also Chinone 2003) from Japan. However, it clearly differs from the latter by the bidentate rostrum (versus tridentate in A. tricuspidata tricuspidata ) and rostrum with lateral teeth (versus without teeth in A. tricuspidata tricuspidata ).

Figures

FIGURE 11. Allosuctobelba vietnamensis 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 12. Allosuctobelba vietnamensis 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 13. Allosuctobelba vietnamensis sp. nov., adult: A—tip of rostrum; B—teeth on left side of rostrum, dorsal view; C—teeth on left side of rostrum, ventral view; D—rostral seta; E—lamellar seta; F—interlamellar seta, G—bothridial seta; H—exobothridial seta, bothridium and notogastral tubercle; I—notogastral seta p 2; J—subcapitulum, ventral view; K—palp; L—chelicera; M—epimeral setae 3 b; N—genital plate, right; O—anal plate, right, and adanal seta ad 1. Scale bar (A, D – F, H, I, K, M) 10 Μm; scale bar (B, C, G, J, L, N, O) 20 Μm.

FIGURE 14. Allosuctobelba vietnamensis sp. nov., adult: A—leg I, without trochanter, right, paraxial view; B—leg IV, left, antiaxial view; C—seta a’ ’ on tarsus III; D—seta v’ ’ on tibia III. Scale bar (A, B) 20 Μm; scale bar (C, D) 10 Μm.

Tables

TABLE 5. Leg setation and solenidia of Allosuctobelba vietnamensis sp. nov.

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