Protoribates shvanderovi, Ermilov, Sergey G. & Starý, Josef, 2017

Ermilov, Sergey G. & Starý, Josef, 2017, New Protoribates (Acari, Oribatida, Haplozetidae) from Vietnam, Zootaxa 4258 (6), pp. 501-524 : 516-522

Protoribates shvanderovi sp. nov.

( Figs 25–34 )

Diagnosis. Body size: 448–464 × 249–265. Rostral, lamellar and interlamellar setae long, setiform, barbed. Bothridial setae long, with heads strongly dilated and barbed unilaterally. Notogastral setae minute. Distance between porose areas A1–A1 shorter than A2–A2. Subcapitular setae h longest, m shortest and thinnest. Epimeral setal formula: 3–1–3–3; setae 3с longest. Circumpedal carinae long. Adanal setae ad 1 and ad 2 of medium size, thickened. Legs monodactylous. Femora II rounded ventroanteriorly.

Description. Measurements. Body length: 464 (holotype, male), 448 (one paratype: one male); notogaster width: 249 (holotype), 265 (one paratype).

Integument. Body color light brownish. Body surface (including genital and anal plates, subcapitular mentum and genae and leg segments) densely microporose (visible under high magnification, ×1000) and sparsely macrofoveolate, but macrofoveolae (their diameter up to 2) very poorly visible. Lateral parts of prodorsum between sublamellae and acetabula I, II microgranulate.

Prodorsum ( Figs 25 , 27 ). Rostrum broadly rounded. Lamellae located dorso-laterally, half as long as prodorsum (measured in lateral view). Prolamellae absent. Sublamellae about two third of lamellae. Sublamellar porose areas oval (12 × 6–8), located very near to sublamellae. Rostral (49–57), lamellar (69–73) and interlamellar (94–98) setae setiform, barbed, le inserted on the lamellar ends. Exobothridial setae (12) thin, slightly barbed. Bothridial setae (69–77) with long, barbed unilaterally stalks and heads short, strongly dilated and barbed unilaterally, pointed distally. Sejugal porose areas band-like, diffuse. Tutoria ridge-like, straight. Lateral ridges present, thin.

Notogaster ( Figs 25 , 27–29 ). Anterior notogastral margin convex medially. Dorsophragmata comparatively short, longitudinally elongated, directed posteromedially. Pteromorphs with distinct hinges. Ten pairs of notogastral setae minute (4), thin, smooth. Four pairs of porose areas rounded, Aa (8–10) larger than others (A1, A2, A3, 6). Distance A1–A1 shorter than A2–A2. Setae lp inserted posteriorly to A1, setae h 3 inserted far anteriorly to A2. Lyrifissures and opisthonotal gland openings clearly visible, ip located posterolaterally to A3.

Gnathosoma ( Fig. 27 ). Morphology similar to P. chistyakovi sp. nov. Subcapitulum longer than wide (110 × 77). Subcapitular setae setiform, slightly barbed, h longest (28–32) longer than a (18–20), m shortest (12) and thinnest. Two pairs of adoral setae (12) setiform, heavily barbed. Palps (length 65) with setation 0–2–1–3–9(+ω). Postpalpal setae (4) spiniform. Chelicerae (length 123) with two barbed setae, cha (57) longer than chb (28). Trägårdh’s organ long, tapered.

Epimeral and lateral podosomal regions ( Figs 26 , 27 ). Epimeral setal formula: 3–1–3–3. Setae setiform, thin, slightly barbed, 3с (22–24) longer than 1b (18–20) and others (10–12). Pedotecta I and II lamina-like, Pd II represented by two connected parts, trapezoid in ventral view, rounded anteriorly. Custodia absent. Circumpedal carinae long, directed to Pd II.

Anogenital region ( Figs 26–29 ). Five pairs of genital (g 1, 18–20; g 2– g 5, 10–12), one pair of aggenital (10–12) and two pairs of anal (20–24) setae and adanal setae ad 3 (16) setiform, slightly barbed. Adanal setae ad 1 and ad 2 of medium size, similar in length (49–57), thickened, erect, barbed. Setae ad 3 inserted laterally to anterior margin of anal aperture. Adanal lyrifissures located close and parallel to anal plates. Marginoventral porose area semioval, interrupted posteromedially.

Legs ( Figs 30–34 ). Legs monodactylous, claws thick, barbed dorsally. Tibiae I and II without clear tubercles ventrobasally. Femora II rounded ventroanteriorly. Dorsoparaxial porose areas on femora and trochanters III, IV, posteroventral porose areas on tarsi and anteroventral porose areas on tibiae poorly 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 (1–2–2–3–11) [0– 1–0]; homology of setae and solenidia indicated in Table 1. Solenidia ω1 on tarsi I, ω1 and ω2 on tarsi II and σ on genua III bacilliform, other solenidia setiform. Famuli short, thin, straight, indistinctly dilated and truncated distally, inserted posteriorly to ω2. Setae s absent on tarsi IV.

Material examined. Holotype (male) and one paratype (male): Northern Vietnam, Tam Dao National Park, 950 m a.s.l., meadow, sample (No. VIE-125) of grass rhizosphere, 17.X.1988 (collected by J. Starý & Nguen Tri Tien) .

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

Etymology. The species is named after the late Dr. Fridrikh A. Shvanderov, the acarologist from Nizhniy Novgorod, Russia, for his significant contribution to our knowledge of eriophyoid mites.

Remarks. Protoribates shvanderovi sp. nov. is morphologically most similar to P. gracilis ( Aoki, 1982) from Japan and Vietnam in having long bothridial setae with heads strongly dilated unilaterally and pointed distally, long adanal setae ad 1 and ad 2 and monodactylous legs. However, the new species differs from the latter by the larger body size (448–464 × 249–265 vs. 340 × 180), localization of lamellar setae on the lamellar ends (vs. on prodorsum, medially to lamellar ends), relative lengths of lamellar, interlamellar and bothridial setae, viz., le longer than ro, in longer than bs (vs. le shorter than ro, in shorter than bs), and short dorsophragmata (vs. long).

Figures

FIGURE 25. Protoribates shvanderovi sp. nov., adult: dorsal view. Scale bar 100 µm.

FIGURE 26. Protoribates shvanderovi sp. nov., adult: ventral view (gnathosoma and legs not shown). Scale bar 100 µm.

FIGURES 27 – 29. Protoribates shvanderovi sp. nov., adult: 27 — anterior part of body, lateral view (legs not shown); 28 — posterior part of body, lateral view; 29 — posterior view (part of left half not shown). Scale bar 100 µm.

FIGURES 30 – 31. Protoribates shvanderovi sp. nov., adult: 30 — leg I, right, antiaxial view; 31 — genu, femur and part of trochanter of leg II, right, antiaxial view. Scale bar 20 µm.

FIGURES 32 – 34. Protoribates shvanderovi sp. nov., adult: 32 — tarsus of leg II, right, antiaxial view; 33 — genu, femur and trochanter of leg III, left, antiaxial view; 34 — leg IV, left, antiaxial view. Scale bar 20 µm.