Pergalumna amamiensis Aoki, 1984

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 : 166-171

Pergalumna amamiensis Aoki, 1984

( Figures 9‒12 )

Supplementary description

Measurements — Body length: 540–680; notogaster width: 390–490. No distinct differences between females and males in body size.

Integument — ( Figures 9A–B , 10A, 10C–D , 12A–F ). Body color brown to black. Body surface foveolate. Prodorsum, genital plates, epimeral and lateral podosomal regions large granules; pteromorphs outer edge and anal plates and the surrounding with granules.

Prodorsum — ( Figures 9A , 10A–B , 12A, 12C–D ). Rostrum pointed. Lamellar and sublamellar lines parallel, long, curving backwards at ventral end. Rostral ro (75–85) and lamellar setae le (100–110) setiform, barbed unilaterally. Interlamellar seta in (140–150) long, setiform, slightly barbed. Bothridial seta bs (120–130) lanceolate, stalk slender, head slightly incrassate and spiculate. Dorsosejugal porose areas (8–12 × 24–28) located under anterior notogastral margin posterior to in, elongate oval.

Notogaster — ( Figures 9A , 10A, 10C–D , 12A, 12D ). Dorsosejugal suture developed, complete. Notogastral setae represented by10 pairs of alveoli. Four pairs porose areas, Aa (10–35 × 50–60) located above to la, transverse long wedge; A1 (diameter 23–28) rounded; A2 (17–22 × 25–28) oval; A3 (diameter 23–28) rounded from posterior view. Median pore present in females and males, located middle to A2. Lyrifissure im located between alveoli lm and lp, closer to lp than lm. Opisthonotal gland gla openings located lateral to A1.

Gnathosoma — ( Figures 9C–E , 12B ). Subcapitulum size: 160–165 × 120–125, three pairs of setiform, smooth, curved subcapitular setae: h (18‒22), m (28‒32) and a (36‒40). Two pairs of setiform, smooth adoral setae or 1 (11‒13) and or 2 (11‒13). Length of palps 120–130. Palp with setation 0­2­1­3­9 (+ solenidion ω). Length of chelicerae 190–200. Cheliceral setae cha (60–65) and chb (55–60) setiform, barbed bilaterally. Trägårdh’s organ long, elongate triangular.

Epimeral and lateral podosomal regions — ( Figures 9B , 10B , 12B ). Epimeres strong granules. Pedotecta I and II rounded in ventral view. Discidium triangular, circumpedal carina distinct. Epimeral setal formula: 1­0­1­2. Four pairs of epimeral setae setiform, thin, smooth 1b (20‒25), 3b (25‒30), 4a (20‒25) and 4b (20‒25).

Anogenital region — ( Figures 9B , 10A, 10C , 12B, 12E–F ). Middle part of genital plates with striate. Six pairs of genital setae (g 1 – g 2, 25–30; g 3 – g 6, 15–20), anterior edges of genital plates with two pairs of setae. One pair of aggenital setae ag (, 10–15) located between genital and anal plates, closer to genital than to anal plates. Two pairs of anal an (1 – an 2, 10–15) and three pairs of adanal setae (ad 1 – ad 3, 10–20), all 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 ad 1 – ad 2 distinctly shorter than ad 2 – ad 3. Postanal porose area oval (13–18 × 28–33).

Legs — ( Figure 11 ). All legs tridactylous, median claw distinctly thicker than lateral

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (’) marks setae on the anterior and double prime (”) setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae. Tr – trochanter, Fe – femur,

Ge – genu, Ti – Tibia, Ta – tarsus.

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

15 females 11 males, Tianmushan National Nature Reserve (30°20 ′ 4 ″ N, 119°26 ′ 18 ″ E,

810 m), Hangzhou City, Zhejiang Province, 27 Jul. 2018, Guoru Ren and Qianfen Zheng, in moss. 2 females 1 male, Gujingyuan National Nature Reserve (31°3 ′ 7″N, 116°30 ′ 7 ″ E, 450

m), Haozhou City, Anhui Province, 25 Jul. 2018, Guoru Ren and Qianfen Zheng, in deciduous leaves.

Specimen deposition

26 samples are deposited in the Institute of Entomology, Guizhou University, Guiyang, China ( GUGC). 3 specimens are deposited in the Guizhou Provincial Center for Disease

Control and Prevention, Guiyang, China.

Remarks

This species was originally described by Aoki (1984) from Japan, but the original description was brief and not completely illustrated, so we gove a supplementary description and illustrations. Apart from the lacking characteristics, the Chinese specimens differ from the Japanese specimens by the rostral, lamellar, interlamellar and bothridial setae which are slightly barbed. Hence, based on these supplementary data, the main characters P of. amamiensis are:

body size: 540–680×390–490, body surface densely foveolate granules; rostrum pointed; lamellar and sublamellar lines present; rostral, lamellar and interlamellar setae developed, setiform, slightly barbed; bothridial setae spindle­shaped, stalk slender and head slightly incrassate and spiculate; dorsosejugal porose areas and dorsosejugal suture present; four pairs of notogastral porose areas, Aa transversely wedge­shaped, A1 rounded, A2 and A3 oval; median pore and postanal porose area present; epimeral setal formula 1­0­1­2; ventral setae, genital setae,

epimeral setae, anogenital and adanal setae represented by microsetae; all legs tridactylous, leg setae not modified.

Figures

Figure 9 Pergalumna amamiensisAoki, 1984, adult: A – dorsal view; B – ventral view; C – subcapitulum, ventral view; D – palp, left, antiaxial view; E – chelicera, right, antiaxial view.

Figure 10 Pergalumna amamiensisAoki, 1984, adult: A – lateral view; B – prodorsum setae; C – posterior view; D – pteromorpha.

Figure 11 Pergalumna amamiensisAoki, 1984, 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.

Figure 12 Pergalumna amamiensisAoki, 1984, adult: A – dorsal view; B – ventral view; C – rostral and lamellar setae; D – detail of prodorsum in lateral view; E – genital plates; F – anal plates.