Allogalumna bochkovi, Ermilov & Starý, 2018

Ermilov, Sergey G. & Starý, Josef, 2018, New Galumnoidea (Acari, Oribatida) from Hanoi (Northern Vietnam), Zootaxa 4379 (4), pp. 497-516 : 498-504

Allogalumna bochkovi sp. nov.

( Figs 1–10 )

Diagnosis. Body size: 464–490 × 381–415. Rostrum rounded. Prodorsal setae long, barbed, ro shortest, in longest. Bothridial setae spindle-shaped, with long, setiform apex, barbed. Dorsosejugal suture present. Notogaster with minute setae and five pairs (Aa divided) of rounded porose areas. Median pore absent in both sexes. Epimeral and anogenital setae short, thin, smooth. Postanal porose area oval.

Description. Measurements. Body length: 464 (holotype: female), 464–490 (three paratypes: two females and one male); notogaster width: 381 (holotype), 381–415 (three paratypes). No differences between females and male in the body size.

Integument. Body color brown. Body surface (including pteromorphs, subcapitular mentum, genital and anal plates, legs) sparsely microporose (visible under high magnification, × 1000).

Prodorsum ( Figs 1–4 ). Rostrum broadly rounded. Sublamellar lines thin, curving backwards. Inner lobe tooth, prodorsal leg niches and lateral ridges of prodorsum well-developed. Rostral (57–65), lamellar (90–94) and interlamellar (151–159) setae setiform, similar in thickness, barbed. Bothridial setae (127–131) spindle-shaped, with long stalk, short head and thin, setiform apex (it longer than head), barbed. Exobothridial setae and their alveoli absent. Sejugal porose areas (16–24 × 4–6) elongate oval, transversely oriented, located posterior to in.

Notogaster ( Figs 1 , 3 , 5 ). Dorsosejugal suture present, slightly convex medially. Dorsophragmata elongated longitudinally, with variable number of components. With 10 pairs of very short, thin, smooth setae (1–2) and five pairs (Aa divided into two parts) of similar in diameter, rounded (8–10) porose areas. Alveoli la inserted posterior to Aal and Aam. Median pore absent in both sexes. All lyrifissures distinct, im located closely lateral to A1, ip between p 2 and p 3, ih and ips close to each other, anterior to p 3. Opisthonotal gland openings anterolateral or lateral to A1 and distanced from it.

Gnathosoma ( Figs 6–8 ). Subcapitulum longer than wide: 106–114 × 98–106. Three pairs of subcapitular setae setiform, smooth, a (20–24) longer and thicker than m and h (both 12–16). Two pairs of adoral setae (16) setiform, indistinctly barbed. Length of palps: 82–90. Axillary saccules distinct, elongated. Postpalpal setae (4) spiniform. Length of chelicerae: 118–135. Two cheliceral setae setiform, barbed, cha (41–45) longer than chb (28–32). Trägårdh’s organ of chelicerae long, elongate triangular.

Epimeral and lateral podosomal regions ( Figs 2 , 3 ). 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, short, reaching level of acetabula IV. Epimeral setal formula: 1–0–1–2. Epimeral setae setiform, smooth, 3b (12–14) longer than 1a, 4a and 4b (6–8).

Anogenital region ( Figs 2 , 3 , 5 ). Six pairs of genital (g 1, g 2, 12–14; g 3– g 6, 6–8), one pair of aggenital (6–8), two pairs of anal (12–14) and three pairs of adanal (12–14) setae setiform, smooth. Anterior edges of genital plates with two setae. Aggenital setae inserted between genital and anal apertures, equal distanced from them. Adanal lyrifissures located close and slightly diagonally to anal plates. Adanal setae ad 1 and ad 2 postanal, ad 3 paraanal and posterior to iad. Distance ad 1– ad 2 shorter than ad 2– ad 3. Unpaired postanal porose area oval (24–30 × 8–10).

Legs ( Figs 9, 10 ). 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 . Three 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. Andrey V. Bochkov (Zoological Institute of the Russian Academy of Sciences, Saint Petersburg, Russia), to acknowledge his extensive contributions to our knowledge of mites.

Remarks. The generic position of the new species needs to be confirmed in the future. Based on the absence of median pore in both sexes, we included it in the genus Allogalumna , but single male paratype was in bad condition, therefore the median pore could not be found by us. If males of the new species are really with a median pore, which are represented by the numerous parts, it should be included in the genus Acrogalumna Grandjean, 1956 , according to generic diagnoses ( Ermilov & Klimov 2017).

Allogalumna bochkovi sp. nov. differs from all species of Allogalumna (and Acrogalumna ) by the spindleshaped bothridial setae having very long, setiform apex (vs. bothridial setae without long, setiform apex).

Figures

FIGURE 1. Allogalumna bochkovi sp. nov., adult:dorsal view. Scale bar 100 µm.

FIGURE 2. Allogalumna bochkovi sp. nov., adult:ventral view (gnathosoma and legs not shown).Scale bar 100 µm.

FIGURES 3–4. Allogalumna bochkovi sp. nov., adult: 3—lateral view (pteromorph, gnathosoma and legs not shown); 4— anterior part of prodorsum, anterior view. Scale bar 100 µm.

FIGURES 5–8. Allogalumna bochkovi sp. nov., adult: 5—posterior view; 6—subcapitulum, ventral view; 7—chelicera, left, paraxial view; 8—palp, right, antiaxial view (trochanter and femur turned). Scale bars 100 µm (5), 50 µm (6, 7; 8).

FIGURES 9–10. Allogalumna bochkovi sp. nov., adult: 9—leg I, without trochanter, left, paraxial view; 10—leg IV, left, antiaxial view. Scale bar 50 µm.