Neoribates pseudojacoti, Ermilov & Starý, 2017

Ermilov, Sergey G. & Starý, Josef, 2017, New Neoribates (Acari, Oribatida, Parakalummidae) from Vietnam, Zootaxa 4303 (1), pp. 51-72 : 52-57

Neoribates pseudojacoti sp. nov.

( Figs 1–13 )

Diagnosis. Body size: 863–898 × 647–713. Rostrum narrowly rounded, with longitudinal ridge. Rostral and lamellar setae setiform, barbed, le inserted on prodorsum, laterally to lamellar ends. Interlamellar setae setiform, with attenuate tips, smooth. Bothridial setae clavate, barbed. Ten pairs of notogastral setal alveoli. Epimeral setae thin, slightly barbed, 3с and 4c longest. Anogenital setae setiform, slightly roughened, adanal setae of medium size, ad 3 inserted in preanal position. Legs tridactylous, lateral claws with one tooth ventrodistally.

Description. Measurements. Body length: 863 (holotype, female), 863–898 (four paratypes: three females and one male); notogaster width: 713 (holotype), 647–713 (paratypes). No clear difference between females and male in body size.

Integument. Body color dark brown. Body surface (including pteromorphs, genital and anal plates, subcapitular mentum and genae and leg segments) densely microporose (visible under high magnification, ×1000). Lateral parts (between bothridia and acetabula) microgranulate. Lamellae slightly striate.

Prodorsum ( Figs 1–3 ). Rostrum narrowly rounded (clearly visible in frontal view), antero-medially with very short longitudinal dorsal ridge (rr), creating illusion of a pointed rostrum in dorsal view. Lobe with projects, creating one inner rostral tooth (irt). Rostrophragmata (rp) relatively thick. Lamellae (lam) located dorso-laterally, slightly longer than half of prodorsum (measured in lateral view), their ends curving anteromedially. Translamellar line represented by two rudimentary parts near lamellae. Sublamellae (slam) are two thirds of the lamellae. Sublamellar porose areas (Al) oval (24–28 × 12–16), partially covered by sublamellae. Rostral (ro, 123–127) and lamellar (le, 155–159) setae setiform, barbed, le inserted on prodorsum, laterally to lamellar ends. Interlamellar setae (in, 192–205) setiform, with attenuate tips, smooth. Exobothridial setae and their alveoli absent. Bothridial setae (bs, 94–98) with longer stalks and shorter, barbed, clavate heads. Sejugal porose areas (Ad) oval, transversely elongated. Anterior (ar) and posterior (pr) ridges simple, distanced from each other. Lateral ridges (lr) poorly visible.

Notogaster ( Figs 1 , 3–5 ). Anterior notogastral margin convex medially. Dorsophragmata (D) comparatively short, longitudinally elongated. Ten pairs of notogastral setae represented by alveoli (c, la, lm, lp, h 1– h 3, p 1– p 3). Four pairs of sacculi (Sa, S1, S2, S3) with small openings. Setae lp inserted posteriorly or posteromedially and close to S1. Lyrifissures (ia, im, ip, ih, ips) and opisthonotal gland openings (gla) clearly visible.

Gnathosoma ( Figs 2 , 3 , 6–8 ). Subcapitulum longer than wide (151–155 × 123–131). Subcapitular setae setiform, m and h similar in length (36–41), barbed, slightly thinner than a (24–28) smooth. Two pairs of adoral setae (or 1, or 2, 16–20) setiform, heavily barbed. Palps (length 94–102) with setation 0–2–1–3–9(+ω). Postpalpal setae (ep, 8) spiniform, smooth. Chelicerae (length 172–176) with two barbed setae, cha (57–61) longer than chb (32–36). Trägårdh’s organs (Tg) long, tapered.

Epimeral and lateral podosomal regions ( Figs 2–4 ). Epimeral setal formula: 3–1–3–3. Setae setiform, thin, slightly barbed, 3с and 4c (57–61) longer than 1b, 3b, 4a and 4b (32–41) and 1a, 1c, 2a and 3a (24–32). Pedotecta I (Pd I) and II (Pd II) small, lamina-like, Pd II rectangular in ventral view, rounded anteriorly. Discidia (dis) triangular, broadly rounded distally. Circumpedal carinae (cp) long, reaching anterior margin of ventral plate.

Anogenital region ( Figs 2–5 , 9 ). Five pairs of genital (32–36), one pair of aggenital (ag, 32–36), two pairs of anal (an 1, an 2, 45–49) and three pairs of adanal (ad 1– ad 3, 69–73) setae setiform, slightly roughened. Setae ad 3 inserted in preanal position. Adanal lyrifissures (iad) located close and parallel to anal plates. Preanal organ (p.o.) bifurcate distally, trapezoid in ventral view. Marginoventral porose area (Amar) represented by numerous rounded or elongate oval parts. Ovipositor elongated (311 × 82), blades (127) shorter than length of distal section (beyond middle fold; 184). Each of three blades with four smooth setae; ψ1 = τ1 (69) setiform, ψ2 = τ a = τ b = τ c (28) thorn-like. Six coronal setae (k) minute (4).

Legs ( Figs 10–13 ). Tridactylous, median claw thicker than laterals, all barbed dorsally. Lateral claws with one tooth ventrodistally. Dorsoparaxial porose areas (p.a.) on femora and trochanters III, IV, posteroventral porose areas on tarsi and anteroventral porose areas on tibiae well visible. Formulas 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 (1–2–2–4–12) [0–0–0]; homology of setae and solenidia indicated in Table 1. Solenidia ω1 on tarsi I, ω1 and ω2 on tarsi II and σ on genua II, III thickened, blunt, other solenidia longer, setiform. Famuli (ɛ) short, straight, dilated and truncated distally, inserted between ω2 and ft”. Setae l’ on genua III, IV thick.

Material examined. Holotype (female): Northern Vietnam, Tam Dao National Park, 1080 m a.s.l., secondary pine forest, sample (No. VIE-175) of mosses and lichens on boulder, 19.X.1988 (collected by J. Starý & Nguen Tri Tien) . Two paratypes (two females): Northern Vietnam, Tam Dao National Park, 1200 m a.s.l., primary submontane foggy forest near TV-transmitter, on SE slope of Dinh Mang Chi Mt., leaf litter sample (No. VIE-189), 20.X.1988 (collected by J. Starý & Nguen Tri Tien) . Two paratypes (one female and one male): Northern Vietnam, Tam Dao National Park, 1000 m a.s.l., agrobiocenose, orange orchard with orange tree, leaf litter sample (No. VIE- 118), 16.X.1988 (collected by J. Starý & Nguen Tri Tien) .

Type deposition. The holotype is deposited in the collection of the Senckenberg Institute , Görlitz, Germany ; four paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology. The specific name pseudojacoti refers to the similarity of the new species with Neoribates jacoti Balogh & Mahunka, 1967 .

Remarks. Neoribates pseudojacoti sp. nov. is morphologically most similar to N. jacoti Balogh & Mahunka, 1967 from Vietnam and Nepal in general traits (body large; bothridial setae with well-developed heads; prodorsal setae long; adanal setae ad 3 inserted in preanal position; five pairs of genital setae). However, the new species differs from the latter by the presence of clavate bothridial setae (vs. lanceolate), median ridge of rostrum (vs. absent) and adanal setae of medium size (vs. short), and the localization of lamellar setae on prodorsum laterally to lamellar ends (vs. on lamellar ends).

Figures

FIGURE 1. Neoribates pseudojacoti sp. nov., adult: dorsal view. Scale bar 100 µm.

FIGURE 2. Neoribates pseudojacoti sp. nov., adult: ventral view (legs not shown). Scale bar 100 µm.

FIGURES 3 – 5. Neoribates pseudojacoti sp. nov., adult: 3 — anterior part of body, lateral view (legs not shown); 4 — posterior part of body, lateral view; 5 — posterior view. Scale bar 100 µm.

FIGURES 6 – 9. Neoribates pseudojacoti sp. nov., adult: 6 — subcapitulum, ventral view; 7 — palp, right, antiaxial view, and postpalpal seta; 8 — chelicera, right, antiaxial view; 9 — ovipositor. Scale bars 20 µm (6 – 8), 50 µm (9).

FIGURES 10 – 11. Neoribates pseudojacoti sp. nov., adult: 10 — leg I (trochanter covered by pedotectum I), right, antiaxial view; 11 — genu, femur and trochanter of leg III, left, antiaxial view. Scale bar 50 µm.

FIGURES 12 – 13. Neoribates pseudojacoti sp. nov., adult: 12 — genu, femur and trochanter (covered by pedotectum II) of leg II, right, antiaxial view; 13 — leg IV, left, antiaxial view. Scale bar 50 µm.