Trichogalumna mironovi, Ermilov & Starý, 2018

Ermilov, Sergey G. & Starý, Josef, 2018, New Galumnoidea (Acari, Oribatida) from Hanoi (Northern Vietnam), Zootaxa 4379 (4), pp. 497-516 : 504-507

Trichogalumna mironovi sp. nov.

( Figs 11–20 )

Diagnosis. Body size: 265–298 × 190–199. Body surface heavily microgranulate, genital plates striate, median parts of notogaster and anogenital region with ridges. Rostrum strongly protruding, quadrangular. Rostral and lamellar setae long, setiform, barbed, interlamellar setae minute, thin, smooth. Bothridial setae with unilaterally dilated, barbed head. Dorsosejugal suture absent medially. Notogaster with 10 pairs of short, thin, smooth setae and two pairs (Aa and A2 absent) of rounded porose areas. Median pore absent. Epimeral and anogenital setae short, thin, smooth. Postanal porose area rounded.

Description. Measurements. Body length: 298 (holotype: female), 265–298 (10 paratypes: 10 females); notogaster width: 199 (holotype), 190–199 (three paratypes).

Integument ( Figs 11 , 12 , 16 ). Body color brown. Body surface (including pteromorphs, anal plates, partially subcapitular mentum) heavily microgranulate (diameter of granules up to 1). Genital plates longitudinally striate. Median parts of notogaster and anogenital region with strong dense ridges of different form. Anal plates and median part of subcapitular mentum with slight, short ridges.

Prodorsum ( Figs 11–14 ). Rostrum strongly protruding (visible in anterior view), quadrangular. Lamellar and sublamellar lines thin, parallel, curving backwards. Inner lobe tooth, prodorsal leg niches and lateral ridges of prodorsum well-developed. Rostral (30–32) and lamellar (38–41) setae setiform, barbed, ro thinner than le an inserted lateral to them close to L. Interlamellar setae (4–6) setiform, thin, smooth. Bothridial setae (57–69) with long stalk and shorter, unilaterally dilated, barbed head. Exobothridial setae and their alveoli absent. Sejugal porose areas very small, rounded (2), located posterolateral to in.

Notogaster ( Figs 11–13 , 15 ). Dorsosejugal suture absent medially. Dorsophragmata elongated longitudinally, with variable number of components. With 10 pairs of short, thin, smooth setae (6) and two pairs (Aa and A2 absent) of similar in diameter, rounded (4–6) porose areas. Alveoli la inserted close to pteromorphal hinges. Median pore absent in females (males not founded in our materials). All lyrifissures distinct, im located closely anterior to A1, ip between p 1 and p 2, ih and ips close to each other, anterior to p 3. Opisthonotal gland openings lateral to A1.

Gnathosoma ( Figs 16–18 ). Subcapitulum longer than wide: 69–77 × 57–61. Three pairs of subcapitular setae setiform, smooth, a (16) longer and thicker than m (8–10), h shortest (4–6), thinnest. Two pairs of adoral setae (8) setiform, indistinctly barbed. Length of palps: 57–65. Postpalpal setae (4) spiniform. Axillary saccules distinct, elongated. Length of chelicerae: 77–82. Two cheliceral setae setiform, barbed, cha (28–32) longer than chb (20). Trägårdh’s organ of chelicerae long, elongate triangular.

Epimeral and lateral podosomal regions ( Figs 12 , 13 ). Anterior margin of epimere I smooth. Pedotecta I broadly rounded, pedotecta II quadrangular, rounded distally in ventral view. Discidia triangular, blunt-ended. Circumpedal carinae thin, of medium size, directed to insertions of 3b, but reaching it. Epimeral setal formula: 1– 0–2–2. Epimeral setae setiform, smooth, 3b, 3c and 4c (6–8) longer than 1a and 4a (4).

Anogenital region ( Figs 12 , 13 , 15 ). Six pairs of genital (g 1, g 2, 6–8; g 3– g 6, 4), one pair of aggenital (4), two pairs of anal (4) and three pairs of adanal (6) setae setiform, smooth. Anterior edges of genital plates with three setae. Aggenital setae inserted posterolateral to genital aperture. Adanal lyrifissures located close and parallel to anal plates. Adanal setae ad 1 and ad 2 postanal, ad 3 paraanal and posterolateral to iad. Distance ad 1– ad 2 similar to ad 2– ad 3. Unpaired postanal porose area rounded (4–6).

Legs ( Figs 19, 20 ). Median claw distinctly thicker than laterals, all slightly barbed on dorsal side. Porose areas on all femora and on trochanters III, IV well visible. Formulas of leg setation and solenidia: I (1–4–3–4–20) [1–2– 2], II (1–4–3–4–15) [1–1–2], III (1–2–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homology of setae and solenidia indicated in Table 1. Famulus on tarsi I inserted anterior to solenidion ω1. Solenidion of tibiae IV inserted in anterior part of the segment.

Type deposition. The holotype (ethanol with drop of glycerol) is deposited in the collection of the Senckenberg Institute , Görlitz, Germany . Ten paratypes (ethanol with drop of glycerol) are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology. This species is named in honour of Dr. Sergey V. Mironov (Zoological Institute of the Russian Academy of Sciences, Saint Petersburg, Russia), to acknowledge his extensive contributions to our knowledge of mites.

Remarks. Trichogalumna mironovi sp. nov. differs from all species of Trichogalumna by the presence of large quadrangular protruding of rostrum (vs. rostrum rounded or slightly protruding) and strong ridges of different form in median part of notogaster and anogenital region (vs. ridges absent), and the absence of notogastral porose areas Aa (vs. present).

Figures

FIGURE 11. Trichogalumna mironovi sp. nov., adult: dorsal view. Scale bar 45 µm.

FIGURE 12. Trichogalumna mironovi sp. nov., adult: ventral view (gnathosoma and legs not shown). Scale bar 45 µm.

FIGURES 13–14. Trichogalumna mironovi sp. nov., adult: 13—lateral view (pteromorph, gnathosoma and legs not shown); 14—anterior part of prodorsum, anterior view.Scale bar 45 µm.

FIGURES 15–18. Trichogalumna mironovi sp. nov., adult: 15—posterior view; 16—subcapitulum, ventral view; 17— chelicera, left, paraxial view; 18—palp, right, antiaxial view.Scale bars 45 µm (15), 17 µm (16, 17; 18).

FIGURES 19–20. Trichogalumna mironovi sp. nov., adult: 19—leg I, without trochanter, left, paraxial view; 20—leg IV, left, antiaxial view. Scale bar 17 µm.