Perxylobates hakkai, Ermilov & Liao, 2020

Ermilov, Sergey G. & Liao, Jhih-Rong, 2020, Contribution to the knowledge of the oribatid mite genus Perxylobates (Acari, Oribatida, Haplozetidae), Acarologia 60 (3), pp. 612-621 : 614-618

Perxylobates hakkai n. sp.

Zoobank: 5E8F86F8-520E-4408-821C-B0807ACC1F9C

( Figures 2–4 )

Diagnosis — Body size 332–398 × 190–215. Lamella long, about 2/3 length of prodorsum. Rostral, lamellar and interlamellar setae of medium length, setiform, barbed, distance ro–

le distinctly shorter than le–in, le pressed to prodorsal surface. Bothridial seta long, with unilaterally dilated head, ciliate. Exobothridial seta minute. Notogastral setae short, setiform, thin, smooth. Four pairs of rounded porose areas present. Epimeral setal formula 3–1–3–2, seta

1c minute, other epimeral and anogenital setae short, setiform, thin, roughened. Five pairs of genital setae. With semi-oval concavity posteriorly to acetabulum IV. Femur III and genu IV with two and one seta, respectively.

Description — Measurements – Body length 365 (holotype), 332–398 (four paratypes);

body width 199 (holotype), 190–215 (four paratypes). Females indistinctly larger than males: 365–398 × 199–215 versus 332–365 × 190–199.

Integument – Body light brown. Surface of body and all legs microporose (visible in dissected specimens under high magnification, × 1000). Antiaxial side of femur III striate.

Prodorsum ( Figs 2a, 2c ) – Rostrum rounded. Lamella long, about 2/3 length of prodorsum. Prolamella absent. Sublamella about 1/3 length of lamella. Sublamellar porose area (18–

22 × 10–12) oval, poorly visible. Tutorium of medium size, about 1/3 length of lamella. Prodorsal lateral carina distinct. Rostral (20–28), lamellar (16–24) and interlamellar (24–30)

setae setiform, barbed, distance ro–le distinctly shorter than le–in, in erect, le located slightly fold; 61). Each of the three blades with four smooth setae 1, ψ ≈ τ 1 (24–28) setiform, ψ 2 ≈ τa ≈

τb ≈ τc (10–12) thorn-like. Six coronal setae not observed.

Legs ( Figs 4 a-c) – Monodactylous. Claw of all tarsi strong, slightly barbed on dorsal side, with tubercle ventrobasally. Tarsus I with longitudinal ridge distodorsally. Tibiae I and II with tubercle proximoventrally. Dorsoparaxial porose area on femora I-IV and on trochanters III, IV distinct. Proximoventral porose area on all tarsi and distoventral porose area on all tibiae not observed. 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 (2–2–1–3–15) [1–1–0], IV (1–2–1–3–12) [0–1–0]; homology of setae and solenidia indicated in Table 1. Famulus of tarsus I short, erect, slightly dilated apically, inserted between solenidion ω 2 and seta ft ஧. Femur III and genu IV with reduced setation, with two and one seta, respectively (seta l ஥ absent). Some ventral setae (a, s, pv) on tarsi I–III thickened, with strong unilateral spines. Solenidion ω 1 on tarsus I, ω 1 and ω 2 on tarsus II and σ on genu III bacilliform, other solenidia setiform.

Material examined — Holotype (male) and four paratypes (one male and three females): Taiwan, Miaoli County, Dahu Township, Biological Control Branch, Miaoli District Agricultural Research and Extension Station , 24°25.416 ஥ N, 120°52.200 ஥ E, 285 m a.s.l., farm, soil under Ricinus communis ( Fig. 1 ), 21.III.2018 (J. R. Liao & H.C. Lee).

Type deposition — The holotype is deposited in the collection of the NTU; four paratypes are deposited in the collection of the TSUMZ .

Etymology — The species name hakkai refers to the Hakka. Taiwanese Hakka people is the main population who lives in the type locality Miaoli County, Taiwan.

Remarks — Distinctive characters of the new species with the other species of the genus Perxylobates can be found in the identification key below.

Figures

Figure 1 Gathering place (Taiwan, Miaoli County, Dahu Township, Biological Control Branch, Miaoli District Agricultural Research and Extension Station) of Perxylobates hakkain. sp.

Figure 2 Perxylobates hakkain. sp., adult: a – dorsal view (legs omitted); b – ventral view (gnathosoma and legs omitted); c – prodorsum, anterior view; d – lateral view (gnathosoma and legs omitted). Scale bar 50 μm.

Figure 3 Perxylobates hakkai n. sp., adult: a – posterior view; b – subcapitulum, ventral view; c – palp, right, antiaxial view; d – chelicera,

Figure 4 Perxylobates hakkain. sp., adult: a – leg I, right, antiaxial view; b – leg II, right, antiaxial view; c – leg III, left, antiaxial view; d – leg IV, left, antiaxial view. Scale bar 20 μm.