Pergalumna (Pergalumna) sidorchukae, Zheng & Liang & Ren & Yang, 2019

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 : 408-413

Pergalumna (Pergalumna) sidorchukae sp. nov.

( Figs. 1‒12 )

Diagnosis. Body size: 610‒680 × 485‒543. Dorsosejugal suture well developed, rectilinear. Lamellar and sublamel- lar lines thin. The lateral margin of notogaster has a distinct saccular surface structure. Pteromorphs with longitudinal striae. Rostral and lamellar setae developed setiform, smooth. Interlamellar setae very long, setiform, barbed terminally and bilaterally. Bothridial setae lanceolate, with long smooth stalk and head with minute barbs. Setae in longest, bs second longest, le longer than ro. Three pairs of oval notogastral porose areas. Median pore (mp) and postanal porose area (Ap) present. Ventral setae, genital setae, epimeral setae, anogenital and adanal setae represented by alveoli or indistinct microsetae. All legs tridactylous.

Descriptions. Measurements. Body length: 627, body width: 490 (holotype, 1♂). Body length 610‒680, body width 485‒543 (paratypes, 7♂♂ 2♀♀).

Integument. Body color brown to black. Prodorsum surface smooth. The lateral margin of notogaster surface has a distinct saccular structure. Pteromorphs with longitudinal striae. Genital plates with four longitudinal striae.

Prodorsum ( Figs. 1‒2 , 4 ). Lamellar (L) and sublamellar (S) lines thin, parallel, curving backwards. Rostral seta ro (88‒94) and lamellar seta le (98‒101) developed, setiform, smooth. Interlamellar seta in (135‒156) setiform, terminal barbed bilaterally. Bothridial seta bs (135‒144) lanceolate, stalk long and smooth, head with minute barbs. Prodorsum surface smooth. Rostrum broadly rounded. Porose area Ad (34‒37 × 5‒9) elongate oval, transversally oriented.

Notogaster ( Figs. 1 , 4, 6, 8 ). Dorsosejugal suture well developed. Dorsophragma (D) of medium size, longitudinally elongated. Ten pairs notogastal setae minute or scarcely seen, only the setal pores visible. Three pairs of porose areas with clear borders, area Aa (15‒18 × 34‒38) and A1 (19‒23 × 34‒38) ovate-oblong transversely, A3 (10‒14 × 33‒37) elongate oval, transversally oriented. Area Aa located nearly to setal alveoli la and distanced from lm. Median pore (mp) present. Lyrifissure im located between setal alveoli lm and lp. Opisthonotal gland openings (gla) located posterior and close to h 3.

Gnathosoma ( Figs. 5, 9‒10 ). Subcapitulum size: 117 × 138, three pairs of short, setiform, smooth subcapitular setae h (3‒4), m (4‒6), a (3‒5), two pairs of short, setiform, curved, smooth adoral setae or 1, or 2 (1‒2). Length of palp: 116. Palp with setation 0-2-1-3-9 (+1 solenidion ω). All setae barbed except on tarsus. Length of chelicera: 151. Two cheliceral setae cha (47), chb (41), setiform, barbed. Trägårdhʼs organ (Tg) unsealed elongate triangular.

Epimeral region ( Fig. 3 ). Discidia (dis) triangular, circumpedal carinae distinct. Epimeral setal formula: 1-0-1- 2. Four pairs of epimeral setae (1a, 3b, 4a, 4b, 2‒4) minute, setiform, smooth.

Anogenital region ( Figs. 3‒4, 6‒7 ). Genital plates with four longitudinal striae. Six pairs of setiform, smooth genital setae, g 1 (14‒22) and g 2 (16‒19) located on anterior edge of genital plates, other four pairs setae g 3 (3‒5), g 4 (14‒18), g 5 (3‒6) and g 6 (2‒4) setiform, smooth. One pair of minute, smooth aggenital setae ag (2‒3). Two pairs of anal setae (an 1, an 2) and three pairs of indistinct adanal setae (ad 1, ad 2, ad 3), only the setal pores visible. Lyrifissure iad located at the level a little posterior to anterior margin of anal aperture. Postanal porose area Ap (9 × 30) elongate oval, transversally oriented.

Legs ( Figs. 11–12 ). 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. Holotype (♂), Xingdoushan National Nature Reserve (29°5’N, 109°50’E), Yichang City, Hubei Province, 3 Aug. 2010, Wenqin Liang , in soil . Paratypes: 5♂♂ 2♀♀, same data as holotype ; 2♂♂, Wanmu Forest in Jianou , Fujian Province, 8 Aug. 2009, Yong Chen, in soil .

Etymology. The specific name “ sidorchukae ” is given in memory of Ekaterina Alekseevna (Katya) Sidorchuk and her contribution to mite research.

Remarks. The new species Pergalumna (P.) sidorchukae sp. nov. is similar to Pergalumna (P.) yurtaevi Ermilov, 2011 from Cat Tien National Park (southern Vietnam), but differs from the latter by the following characteristics: (1) the lateral margin of notogaster shows a distinct saccular structure (versus surface of notogaster smooth in Pergalumna (P.) yurtaevi ), (2) all porose areas of notogaster are oval (versus all porose areas of notogaster are round), (3) postanal porose area present (versus postanal porose area absent).

Figures

FIGURE 3. Pergalumna (Pergalumna) sidorchukae sp. nov., adult: ventral view. Scale bar 100 μm.

FIGURES 1–2. Pergalumna (Pergalumna) sidorchukae sp. nov., adult: 1—dorsal view; 2—bothridial setae. Scale bars 100 μm (1), 25 μm (2).

FIGURES 4–10. Pergalumna (Pergalumna) sidorchukae sp. nov., adult: 4—lateral view; 5—palp, left, antiaxial view; 6—posterior view; 7—right genital plate; 8—pteromorpha; 9—subcapitulum; 10—chelicera, left, antiaxial view. Scale bars 100 μm (4, 6), 50 μm (7, 9‒10), 25 μm (5, 8).

FIGURES 11–12. Pergalumna (Pergalumna) sidorchukae sp. nov., adult: 11—leg I, right, antiaxial view; 12—leg IV, left, antiaxial view. Scale bars 50 μm.

Tables

TABLE 1. Leg setation and solenidia of adult Pergalumna (Pergalumna) sidorchukae sp. nov., Pergalumna (Pergalumna) jongkyui Choi, 1986 and Pergalumna (Pergalumna) amorpha Mahunka, 2008.

Leg	Tr	Fe	Ge		Ti	Ta
I	v’	d, (l), bv”	(l), v’,	σ	(l), (v), φ 1, φ 2	(ft), (tc), (it), (p), (u), (a), s, (pv),	v’, (pl), l”, ɛ, ω 1, ω 2
II	v’	d, (l), bv”	(l), v’,	σ	(l), (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv),	ω 1, ω 2
III	v’	d, ev’	l’, σ		l’, (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv)
IV	v’	d, ev’	d, l’		l’, (v), φ	ft’’, (tc), (p), (u), (a), s, (pv)

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—tro-chanter, Fe—femur, Ge—genu, Ti—Tibia, Ta—tarsus.