Pergalumna jongkyui Choi, 1986

Zheng, Qianfen, Liang, Wenqin, Ren, Guoru & Yang, Maofa, 2019, A new species and two newly recorded species of the subgenus Pergalumna (Pergalumna) (Acari, Oribatida, Galumnidae) from China, Zootaxa 4647 (1), pp. 407-423 : 413-415

Pergalumna jongkyui Choi, 1986

( Figs. 13‒25 )

Diagnosis. Body size: 530‒650 × 410‒500. Dorsosejugal suture absent. Body surface smooth. Pteromorphs with longitudinal striae and outer edge microgranulate. Rostral setae short, imperceptible. Lamellar setae setiform, barbed unilaterally. Interlamellar setae setiform, bilaterally and terminally intensively barbed. Bothridial setae setiform, thick throughout the length, densely barbed bilaterally, setae bs longest, le longer than in. Three pairs of porose areas with clear borders, oval, large. Median pore (mp) area absent. Postanal porose area present. All legs tridactylous.

Descriptions. Measurements. Body length: 530‒650, body width: 410‒500.

Integument. Body color brown. Body surface smooth. Pteromorphs with longitudinal striae and outer edge microgranulate. Genital plates with many longitudinal striae. Fine lines are densely distributed around the anal plate.

Prodorsum ( Figs. 13 , 15 ). Prodorsum surface smooth. Rostral margin broadly triangular. Lamellar (L) lines well developed, straight. Sublamellar (S) lines thin, curving backwards. Rostral seta (ro) short, imperceptible. Lamellar seta le (81‒92) setiform, barbed unilaterally. Interlamellar seta in (64‒70) setiform, erect, bilaterally and terminally intensively barbed. Bothridial seta bs (122‒130) setiform, thick throughout the length densely barbed bilaterally. Porose area Ad absent.

Notogaster ( Figs. 13 , 15‒17 ). Dorsosejugal suture absent. Dorsophragma (D) of medium size, longitudinally irregularly elongated. Ten pairs notogastral setae minute or scarcely seen, only the setal pores visible. Three pairs of porose areas with clear borders, oval, large, area Aa (diameter 40‒45) rounded, area Aa located between setal alveoli la and lm, and equally distanced from them, area A1 (27‒31 × 39‒43) oval, area A3 (10‒12 × 39‒43) elongate oval, transversally oriented. Lyrifissure im located lateral-posteriorly to la. Opisthonotal gland opening (gla) located above A1. Median pore (mp) area absent.

Gnathosoma ( Figs. 18‒19, 21 ). Subcapitulum size: 59 × 71. Three pairs of subcapitular setae h, m, a setiform, seta h (7‒10) barbed bilaterally, erect, setae m (5‒7) and a (6‒8) barbed unilaterally, curved. Two pairs of setiform, smooth adoral setae or 1, or 2 (2‒4). Length of palp: 84. Palp with setation 0-2-1-3-9 (+ solenidion ω). All setae barbed except on tarsus. Length of chelicera: 124. Two setiform, bilaterally barbed cheliceral setae cha (39), chb (27). Trägårdhʼs organ (Tg) long, elongate triangular.

Epimeral region ( Fig. 14 ). Discidium (dis) triangular, circumpedal carinae distinct. Epimeral setal formula: 1- 0 - 1 - 2. Four pairs of setiform, smooth epimeral setae 1a (3‒5), 3b (3‒6), 4a (5‒8) and 4b (4‒8).

Anogenital region ( Figs. 14‒15, 17, 20 ). Genital plates with many longitudinal striae. Six pairs of genital setae, g 1 (16‒18) and g 2 (18‒20) located on anterior edge of genital plates, setiform, smooth, others four pairs indistinct, only setal pores visible. One pair of indistinct aggenital setae (ag), only the setal pores visible. Two pairs of anal (an 1, an 2) and three pairs of adanal setae (ad 1, ad 2, ad 3), an 1 (39‒44), an 2 (33‒39) and ad 1 (44‒48) long, setiform, smooth, erect, ad 2 and ad 3 setae indistinct, only the setal pores visible. Lyrifissure iad located posterior to anterior margin of anal aperture, postanal porose area Ap (66 × 9) irregularly elongated. Fine lines are densely distributed around the anal plate.

Legs ( Figs. 22‒25 ). All legs tridactylous. Median claw distinctly thicker than laterals all barbed on dorsal sides. 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 .

Material examined. 5♂♂ 2♀♀, China, Baxunzi Town , Benxi City, Liaoning Province (41°14’ N, 124°54’E), 4 Aug. 2010, Lixia Xie & Rong Huang, in soil ; 7♂♂, Zhouzhi City (34°10’N, 108°13’E), Xian Town, Shanxi Prov- ince, China, 2 Jul. 2009, Zhanyu Hu, in soil ; 8♂♂ 4♀♀, Wuling Mountain National Nature Reserve (117°30’N, 40°36’E), Hebei Province, China, 8 Aug. 2011, Meng Jiao, in soil .

Remarks. Pergalumna jongkyui was described by Choi (1986) from Korea, but the original description is brief and not completely illustrated, lacking information about some morphological structures and their sizes, the solenidia, morphology of gnathosoma and the leg setation. The species is hereby described and illustrated supplementary from China, which will help to identify this species in the future.

Figures

FIGURE 13. Pergalumna jongkyui Choi, 1986, adult, dorsal view. Scale bar 100 μm.

FIGURE 14. Pergalumna jongkyui, adult, ventral view. Scale bar 100 μm.

FIGURES 15–21. Pergalumna jongkyui, adult: 15—lateral view; 16—pteromorpha; 17—posterior view; 18—chelicera, right, antiaxial view; 19—palp, right, antiaxial view; 20—genital plate; 21—subcapitulum. Scale bars 100 μm (15, 17), 50 μm (19, 21), 25 μm (16, 18, 20).

FIGURES 22–23. Pergalumna jongkyui, adult: 22—leg I, right, antiaxial view; 23—leg II, right, antiaxial view. Scale bars 50 μm.

FIGURES 24–25. Pergalumna jongkyui, adult: 24—leg III, left, antiaxial view; 25—leg IV, left, antiaxial view. Scale bars 50 μm.