Pergalumna pilosus, Zheng & Liang & Ren & Yang, 2021

Zheng, Qian-Fen, Liang, Wen-Qin, Ren, Guo-Ru & Yang, Mao-Fa, 2021, Two new and a newly recorded species of the genusPergalumna (Acari, Oribatida, Galumnidae) from China, Acarologia 61 (1), pp. 154-172 : 161-166

Pergalumna pilosus n. sp.

Zoobank: 6E649612-AD54-4A21-8C4A-769F9A25BD46

( Figures 5‒8 )

Diagnosis

Body surface smooth, pteromorphs outer edge short striae, middle part of genital plates with striate. Rostrum pointed. Lamellar and sublamellar lines present. Rostral, lamellar, interlamellar and bothridial setae developed, setiform, slightly barbed. Dorsosejugal porose areas and dorsosejugal suture present. Four pairs of notogastral porose areas, Aa transverse long wedge, A1 rounded, A2 and A3 oval. Median pore and postanal porose area present.

Description

Measurements — Body length: 630 (holotype), 560–670 (26 paratypes); notogaster width: 450 (holotype), 400–480 (26 paratypes). No distinct differences between females and males in body size.

Integument — ( Figures 5A–B , 6A, 6C–D , 8A–E ). Body color brown to black. Body surface smooth, pteromorphs outer edge short striae, the middle part of genital plates with striate, the middle of pteromorphs bilobed.

Prodorsum — ( Figures 5A , 6A–B , 8A, 8F ). Rostrum pointed. Lamellar and sublamellar lines parallel, curving backwards at ventral end. Rostral ro (70–80) and lamellar setae le (95–105) setiform, barbed unilaterally. Interlamellar seta in (130–140) long, setiform, first half almost smooth and the second half has a few bilaterally slightly barbed. Bothridial seta bs (120–130) setiform, slightly barbed. Dorsosejugal porose areas Ad (9–13 × 30–33) located under anterior notogastral margin posterior to in, elongate oval.

Notogaster — ( Figures 5A , 6A, 6C–B , 8A ). Dorsosejugal suture developed, complete. Notogastral setae represented by10 pairs of alveoli. Four pairs porose areas, Aa (10–46 × 100–103) located between la and lm, transverse long wedge; A1 (diameter 25–30) rounded; A2 (10–13 × 25–28) and A3 (18–21 × 40–43) oval. Median pore present in females and males, located posterior to imaginary line connecting porose areas A1. Lyrifissure im located between alveoli lm and lp. Opisthonotal gland gla openings located posterolateral to A1, lateral to h 3.

Gnathosoma — ( Figures 5C–E , 8D ). Subcapitulum size: 161–166 × 153–158, three pairs of setiform, smooth, curved subcapitular setae: h (24‒28), m (36‒40) and a (32‒36). Two pairs of setiform, smooth adoral setae or 1 (5‒9) and or 2 (5‒9). Length of palps 140–145. Palp with setation 0­2­1­3­9 (+ solenidion ω). Length of chelicerae 192–197. Cheliceral setae cha (73–78) and chb (50–55) setiform, barbed bilaterally. Trägårdh’s organ long, elongate triangular.

Epimeral and lateral podosomal regions — ( Figures 5B , 6A , 8B ). Epimeres smooth. Pedotecta I and II rounded in ventral view. Discidium triangular, circumpedal carina distinct. Epimeral setal formula: 1­0­1­2. Four pairs (1b, 3b, 4a and 4b (3‒7) of epimeral setae setiform, thin, smooth.

Anogenital region — ( Figures 5B , 6A, 6C , 8B, 8C, 8E ). Middle part of genital plates with striate. Six pairs of genital setae (g 1 – g 6, 10–15), anterior edges of genital plates with two pairs of setae. One pair of aggenital seta ag (, 4–8) located between genital and anal plates, closer to genital than to anal plates. Two pairs of anal and three pairs of adanal setae short, thin, smooth. Adanal lyrifissures located close and lateral to anal plates. Adanal setae ad 1 and ad 2 postanal, ad 3 located anterolateral to iad. Distance between ad 1 – ad 2 distinctly shorter than that of ad 2 – ad 3. Postanal porose area oval (15–20 × 60–65).

Legs — ( Figure 7 ). All legs tridactylous, median claw distinctly thicker than lateral claws. Formulas of leg setation and solenidia: I (1­4­3­4­20) [1­2­2], II (1­4­3­4­15) [1­1­2], III (1­2­1­3­15) [1­1­0], IV (1­2­2­3­12) [0­1­0]. Famulus on tarsi I inserted between solenidia ω 1 and ω 2. Solenidion on tibiae IV inserted in anterior part of the segment. Homology of setae and solenidia indicated in Table 1.

Material examined

Holotype (male), Damingshan National Nature Reserve (23°30 ′ N, 108°27 ′ E), Nanning City, Guangxi Province, 16 May 2010, Rong Huang , in soil. 26 paratypes: 2 (1 female 1 male) same data as holotype; 10 (3 females 7 males), Zhuque National Forest Park (33°47 ′ N, 108°35 ′ E), Xian City , Shanxi Province, 11 Jul. 2012, Wenqin Liang and Qiuxiao Tang , litter in the mixed forest; 11 (7 females 4 males), Wen county (33°3 ′ 25 ″ N, 104°42 ′ 31 ″ E, 1800 m), Longnan City , Gansu Province, 14 Aug. 2018, Guoru Ren and Maofa Yang , in soil; 3 (2 females 1 male), Gaoleshan National Nature Reserve (30°19 ′ 22 ″ N, 119°26 ′ 44 ″ E, 420 m), Nanyang City , Henan Province, 21 Jul. 2018, Guoru Ren and Qianfen Zheng , in soil.

Type deposition

The holotype and 16 paratypes are deposited in the Institute of Entomology, Guizhou University, Guiyang, China ( GUGC). 10 paratypes are deposited in the Guizhou Provincial Center for Disease Control and Prevention, Guiyang, China.

Etymology

The name of the new species comes from the Latin name “ pilosus ” meaning “ hairy ” which refers to the comparable long cilia on rostrum, lamellar and interlamellar setae of the new species.

Remarks

In having dorsosejugal suture complete; Aa porose area transverse irregular wedge; longer interlamellar barbed; median pore and postanal porose area present, Pergalumna pilosus n. sp.

is morphologically similar to Pergalumna variosculpturata Mahunka and Mahunka­Papp,

1999 and Pergalumna microtuberculata Bayartogtokh and Akrami, 2014 , but differs from the latter two species by the following characteristics: (1) Bothridial setae setiform (versus bothridial setae lanceolate, stalk slender and head slightly incrassate and speculate in latter two species). (2) Interlamellar setae very long (130–140); significantly longer than le and ro (versus interlamellar, lamellar and rostral setae are not much difference in length). (3) Epimeral region smooth (versus epimeral region with granules and striations).

Figures

Figure 5 Pergalumna pilosusn. sp., adult: A – dorsal view; B – ventral view; C – subcapitulum, ventral view; D – palp, left, antiaxial view; E – chelicera, left, antiaxial view.

Figure 6 Pergalumna pilosusn. sp., adult: A – lateral view; B – prodorsum setae; C – posterior view; D – pteromorpha.

Figure 7 Pergalumna pilosusn. sp., adult: A – leg I, left, antiaxial view; B – leg II, left, antiaxial view; C – leg III, right, antiaxial view; D – leg IV, right, antiaxial view.

Figure 8 Pergalumna pilosusn. sp., adult: A – lateral view; B – ventral view; C – genital plates; D – subcapitulum and rostral setae; E – anal plates; F – interlamellar and bothridial setae.