Neumania (Lemienia) diversa Savatenalinton & Smit, 2017

K, Zhu-Hui Ding, YiK, Tian-Ci, GuoK, Jian-Jun & K, Dao-Chao Jin, 2025, Studies on the subgenus Lemienia Koenike, 1910 new to China (Acari, Hydrachnidia, Neumania), Acarologia 65 (2), pp. 313-330 : 318-321

Neumania (Lemienia) diversa Savatenalinton & Smit, 2017 , new to China

( Figures 3–5 )

Diagnosis — Idiosoma soft, densely with fine setae, dorsum with two pairs of small oval dorsalia. The tubercle at the subterminal of the P-4 ventral surface larger than the middle one. 12–22 pairs acetabula mostly or entirely attached to the ventral integument, male pregenital sclerite U-shaped, IV-L-5, 6 slightly deformed in male.

Material examined — 1♂, 1♀ ; Diaoluo Mountain National Nature Reserve, China ; 18°42′73″N, 109°50′26″E, 578 m a.s.l.; 30 Jan. 2018 ; Zhu-Hui Ding and Xin-Yao Gu leg.; GUGC.

Description — Male: Idiosoma soft, covered with fine setae, dorsum with two pairs of quite blurry dorsalia, D 3 without glandular sclerites, excretory pore terminally located, with a well-developed tubercle ( Figure 3A ). Coxal plates in four groups, interspace between Cx-II and Cx-III narrow, suture line between Cx-III/IV complete, posterior apodemes of ACG extending to three-fourths of Cx-IV, posterior projection of Cx-IV long and straight ( Figure 3B ). Genital field wider than long, with 12–22 pairs of acetabula, few acetabula situated on small genital palates, the rest on the soft venter; genital field with 11–12 pairs of genital setae, excretory pore V-shaped, located subterminally ( Figure 4F ).

Palp typically five-segmented. P-1 with one dorsal seta, P-2 with three dorsal setae, P-4

with two ventral setae situated on tubercles, and the subterminal one larger than the middle one, along with one peg-like seta inserted at its well-developed base. ( Figure 4A ). Ventral apodeme of gnathosoma slightly longer than dorsal apodeme, the apex of the ventral projection curves upward to form a right angle ( Figure 4C ). Chelicera with a well-developed claw ( Figure 4E ). II-L-4, 5 ventrodistally with one short swimming seta each ( Figure 5B ). III-L-3, -4, -5

distally with one, ten, two swimming setae, respectively ( Figure 5C ). IV-L-3, -4, -5 distally with five, ten, six swimming setae, respectively, and IV-L-5 tapers gradually. IV-L-6 light curving, ventrally with four serrate setae ( Figure 5D ).

Measurements — Male (n = 1): Idiosoma L 673, W 531 (L/W ratio 1.27); genital plates L 157, W 244 (L/W ratio 0.64). LA 455; LP 291; medial distance between Cx-IV 18. Gnathosoma

L 111. Chelicera L 189. Ejaculatory complex L: 123. Lengths of the palp segments (P-1–5):

37, 129, 72, 126, 49. Lengths of I-L-1–6: 101, 161, 187, 291, 365, 256. Lengths of II-L-1–6:

100, 159, 194, 320, 373, 279. Lengths of III-L-1–6: 101, 133, 161, 259, 300, 273. Lengths of IV-L-1–6: 145, 150, 223, 300, 369, 287.

Female: Interspace between Cx-II and Cx-III wide, the mid-edge spacing of Cx-IV broad, and the posterior projection of Cx-IV bends outward, resembling the shape of the Arabic numeral “3” ( Figure 3D ). Genital field with 10–11 pairs of free genital setae and 26–28 pairs of acetabula ( Figure 4G ). IV-L-3, -4, -5 distally with five, ten, five long swimming setae, respectively ( Figure 5E ).

Measurements — Female (n = 1): Idiosoma L 1301, W 969 (L/W ratio 1.34); genital plates

L 192, W 108 (L/W ratio 1.78); gonopore L 263. LA 562; LP 380; medial distance between Cx-IV 90. Gnathosoma L 130. Chelicera L 198. Lengths of the palp segments (P-1–5): 43, 138,

71, 128, 55. Lengths of I-L-1–6: 115, 177, 229, 345, 376,239. Lengths of II-L-1–6 (II-L-2–6):

111, 170, 211, 352, 370, 249. Lengths of III-L-1–6: 103, 135, 173, 300, 340, 290. Lengths of IV-L-1–6: 135, 174, 252, 333, 384, 336.

Remarks — This species was first described by Savatenalinton and Smit (2017) in Thailand. The Thai specimens lack small dorsal plates, possibly because the plates are too indistinct; and the other features are nearly identical. While the curvature of IV-L- 6 in males is not particularly pronounced, the arrangement of ventral setae on the anterior part of IV-L-6 conforms to the typical features of the subgenus Lemienia .

Distribution — China (Hainan Province); Thailand, pond.

Figures

Figure 3 Neumania (Lemienia) diversa(Male A, B; Female C, D): A, C – Idiosoma, dorsal view; B, D – Idiosoma, ventral view; Scale bars = 100 μm.

Figure 4 Neumania (Lemienia) diversa(Male A, C–F; Female B, G): A, B – Palp; C – Gnathosoma; D – Ejaculatory Complex; E – Chelicera; F, G – Genital field; Scale bars = 100 μm.

Figure 5 Neumania (Lemienia) diversa(Male A–D; Female E): A – I-L-1–6; B – II-L-1–6; C – III- L-1–6; D – IV-L-1–6; E – IV-L-5, 6; Scale bars = 100 μm.