taxonID	type	description	language	source
03D287EEFFF67D4FFE68FB8DFC41EFA4.taxon	diagnosis	Diagnosis — Integument smooth, idiosoma soft, without dorsal and ventral shields, but sometimes male well-sclerotized, all glandularia normal. Female with single pair of genital plates, pregenital and postgenital sclerites all away from the genital plates, male genital field fused with Cx-IV occasionally. V 4 usually located on the lower side of the genital field, sometimes fused with the male genital field. Palp typically five-segmented. Leg IV sexually dimorphic, IV-L- 5 sometimes with concavity, and IV-L- 6 always curved and arched in male. Habitat — Slow flowing water, standing waters.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4FFE68FB8DFC41EFA4.taxon	distribution	Distribution — The Afrotropical, Palaearctic, Australian and Oriental regions.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4FFE68FB8DFC41EFA4.taxon	discussion	Remarks — This subgenus was discovered in China for the first time, distributed across Shandong, Anhui, Hainan, and other regions, spanning the Palearctic and Oriental regions. The subgenus Lemienia is characterized solely by the bowed IV-leg- 6 in males. Additionally, the arrangement of setae along the ventral margin of this segment is unique within the subgenus (Smit 2020). However, distinguishing females is particularly challenging, especially with the nominate subgenus Neumania, which appears very similar. We observed that the key difference lies in the positioning of the glandularia V 4: in the subgenus Lemienia, these glandularia are primarily located on the lower side of the genital field, whereas in the subgenus Neumania, they are positioned upper side of the genital field.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4DFE68F93EFBE1EAB3.taxon	description	(Figure 1)	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4DFE68F93EFBE1EAB3.taxon	diagnosis	Diagnosis — Idiosoma soft, dorsum with a pair of small dorsalia, suture line between Cx-III / IV incomplete, female genital field with 13 pairs of acetabula, V 4 located posterolateral to the genital field. P- 3 with two asymmetric dorsal setae, P- 4 with two well-separated ventral setae and a distal peg-like seta. Ventral apodeme of gnathosoma slightly longer than dorsal apodeme.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4DFE68F93EFBE1EAB3.taxon	materials_examined	Material examined — Holotype: ♀ ; 34 - 1, Wanding County, Yunnan Province, China ; 24 ° 5 ′ 4 ″ N, 98 ° 4 ′ 16 ″ E, 836 m a. s. l. ; 31 May 1992 ; Dao-Chao Jin leg. ; GUGC.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4DFE68F93EFBE1EAB3.taxon	description	Description — female: Integument smooth and soft, dorsum with a pair of round dorsalia, L 4 inflated. Coxal plates in four groups, surface lightly reticulated, interspace between Cx-II and Cx-III wider, posterior apodemes of ACG extending to half of Cx-IV, posterior projection of Cx-IV somewhat straight and blurry. Genital field with 13 pairs of acetabula, length of gonopore longer than genital plates (Figure 1 F), V 4 inflated located posterolateral to the genital field, excretory pore located terminally. Palp typically five-segmented, P- 1 without seta, P- 2 with three dorsal setae, P- 3 with a dorsodistal seta much longer than the mediolateral one, P- 4 with two small setal tubercles each bearing one seta and a peg like seta inserting on its well-developed base, with a distolateral long fine seta, P- 5 claws distinctly trigeminal (Figure 1 E). Ventral apodeme of gnathosoma slightly longer than dorsal apodeme. Chelicera with a well-developed claw. II-L- 4, - 5 ventrodistally each with a swimming setae. III-L- 3, - 4, - 5 distally with one, five, three swimming setae, respectively. IV-L- 3, - 4, - 5 with three, five, three swimming setae, respectively. IV-L- 6 ventrally with two serrate setae (Figure 1 A – D). Measurements — Female (n = 1): Idiosoma L 748, W 600 (L / W ratio 1.47) ; genital plates L 117, W 93 (L / W ratio 1.26). LA 383 ; LP 235 ; medial distance between Cx-IV 113. Gnathosoma L 134. Chelicera L 139. Lengths of the palp segments (P- 1 – 5): 24, 100, 52, 96, 35. Lengths of I-L- 1 – 6: 77, 125, 145, 222, 211, 170. Lengths of II-L- 1 – 6: 80, 117, 147, 230, 225, 173. Lengths of III-L- 1 – 6: 79, 98, 108, 181, 200, 193. Lengths of IV-L- 1 – 6: 87, 118, 159, 218, 236, 212. Male: Unknown.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4DFE68F93EFBE1EAB3.taxon	discussion	Remarks — Neumania heterotaxis was originally described by Jin (1997). Examination of the type specimens from Jin’s collection revealed that V 4 is positioned posterolateral to the genital field, and V 2 is not enlarged — distinctive features of the subgenus Lemienia. Furthermore, the distribution of swimming setae on leg IV matches perfectly with those of Lemienia, confirming that this species belongs to this subgenus.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF67D4DFE68F93EFBE1EAB3.taxon	distribution	Distribution — China (Yunnan Province), rice fields.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF47D4BFE68FC2DFB81E8AB.taxon	description	(Figure 2)	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF47D4BFE68FC2DFB81E8AB.taxon	diagnosis	Diagnosis — Idiosoma soft, dorsum with two pairs of small dorsalia, suture line between Cx-III / IV complete, female genital field with 19 – 21 pairs of acetabula, V 4 located posterolateral to the genital field. P- 3 distally with two asymmetric dorsal setae, P- 4 with two well-separated ventral setae and a triangular sclerotized extension extending to half of P- 5. Ventral apodeme of gnathosoma much longer than dorsal apodeme.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF47D4BFE68FC2DFB81E8AB.taxon	materials_examined	Material examined — Holotype: ♀ ; 47 - 2, Huaxi District, Guiyang City, Guizhou Province, China ; 26 ° 27 ′ 39 ″ N, 106 ° 41 ′ 3 ″ E, 1102 m a. s. l. ; 25 Apr. 1991 ; Dao-Chao Jin leg. ; GUGC.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF47D4BFE68FC2DFB81E8AB.taxon	description	Description — Female: Integument smooth and soft, dorsum with two pairs of oval dorsalia, L 4 inflated. Coxal plates in four groups, surface lightly reticulated, interspace between Cx-II and Cx-III wider, posterior apodemes of ACG extending to one-third of Cx-IV, posterior projection of Cx-IV somewhat hook-like. Genital field with 19 – 21 pairs of acetabula, length of gonopore longer than genital plates (Figure 2 E), V 4 inflated located posterolateral to the genital field. Palp five-segmented, P- 1 with one dorsal seta, P- 2 with three dorsal setae, the proximal twos slightly longer, P- 4 with two well-separated small setal tubercles each bearing one seta and a peg like seta inserting on its base, distally with a triangular sclerotized extension extending to half of P- 5 (Figure 2 F). Ventral apodeme of gnathosoma much longer than dorsal apodeme, the surface of ventral apodeme wide and curved upwards, with a small protrusion at the base, the dorsal apodeme slender and upswept. II-L- 4, - 5 ventrodistally each with a swimming setae. III-L- 3, - 4, - 5 distally with one, five, three swimming setae, respectively. IV-L- 3, - 4, - 5 with two, five, three swimming setae, respectively. IV-L- 6 ventrally with one serrate seta (Figure 2 A – D). Measurements — Female (n = 1): Idiosoma L 791, W 670 (L / W ratio 1.47) ; genital plates L 137, W 98 (L / W ratio 1.40) ; gonopore L 197. LA 365 ; LP 261 ; medial distance between Cx-IV 52. Gnathosoma L 153. Chelicera L 153. Lengths of the palp segments (P- 1 – 5): 29, 104, 48, 113, 47. Lengths of I-L- 1 – 6: 75, 109, 121, 181, 186,179. Lengths of II-L- 1 – 6 (II-L- 2 – 6): 110, 114, 187, 197, 169. Lengths of III-L- 1 – 6: 63, 87, 92, 148, 176,163. Lengths of IV-L- 1 – 6: 101, 108, 130, 194, 219, 196. Male: Unknown.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF47D4BFE68FC2DFB81E8AB.taxon	discussion	Remarks — This species, described by Jin (1997), was initially classified under the subgenus Neumania. Although only female specimens were collected, the position of V 4 posterolateral to the genital field and normal V 2 clearly indicate its placement in the subgenus Lemienia. Certain characteristics of this species resemble those of N. quadroa sp. nov., which is found in Shandong and Anhui provinces. However, N. quadroa differs in that its P- 4 extends from the dorsal side, whereas in this species, it extends from the ventral side. Additionally, N. quadroa has a greater number of acetabula.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF47D4BFE68FC2DFB81E8AB.taxon	distribution	Distribution — China (Guizhou Province), stream.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF27D46FE68FE36FB31EEE5.taxon	description	(Figures 3 – 5)	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF27D46FE68FE36FB31EEE5.taxon	diagnosis	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.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF27D46FE68FE36FB31EEE5.taxon	materials_examined	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.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF27D46FE68FE36FB31EEE5.taxon	description	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 3 A). 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 3 B). 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 4 F). 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 4 A). Ventral apodeme of gnathosoma slightly longer than dorsal apodeme, the apex of the ventral projection curves upward to form a right angle (Figure 4 C). Chelicera with a well-developed claw (Figure 4 E). II-L- 4, 5 ventrodistally with one short swimming seta each (Figure 5 B). III-L- 3, - 4, - 5 distally with one, ten, two swimming setae, respectively (Figure 5 C). 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 5 D). 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 3 D). Genital field with 10 – 11 pairs of free genital setae and 26 – 28 pairs of acetabula (Figure 4 G). IV-L- 3, - 4, - 5 distally with five, ten, five long swimming setae, respectively (Figure 5 E). 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.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF27D46FE68FE36FB31EEE5.taxon	discussion	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.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFF27D46FE68FE36FB31EEE5.taxon	distribution	Distribution — China (Hainan Province) ; Thailand, pond.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFF7D45FE68F870FB17EEC8.taxon	description	(Figures 6 – 8)	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFF7D45FE68F870FB17EEC8.taxon	diagnosis	Diagnosis — Male idiosoma moderate sclerotization, with a dorsal plate. Female with weak sclerotization. Genital field with 8 – 15 pairs of acetabula. P- 4 distally with one dagger-shaped sclerotized extension. IV-L- 6 of male curved.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFF7D45FE68F870FB17EEC8.taxon	etymology	Etymology — The specific name is from Latin word: “ quadro- ” means quadrate, the name of this new species is derived from the quadrate idiosoma of the male.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFF7D45FE68F870FB17EEC8.taxon	materials_examined	Material examined — Holotype: ♂ ; Kunyushan National Nature Reserve, Shandong Province, China ; 37 ° 17 ′ 49 ″ N, 121 ° 45 ′ 58 ″ E, 84 m a. s. l. ; 20 Jul. 2017 ; Xin-Yao Gu and Zhu-Hui Ding leg. ; GUGC. Paratypes: 1 ♂, 5 ♀♀ ; the same data as the holotype ; GUGC. 2 ♂♂, 2 ♀♀ ; Mount Huangshan Town, Mount Huangshan City, Anhui Province ; 30 ° 9 ′ 25 ″ N, 118 ° 8 ′ 0 ″ E, 768 m a. s. l. ; 21 Jun. 2002 ; Tian-Ci Yi leg. ; GUGC.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFF7D45FE68F870FB17EEC8.taxon	description	Description — Male: Idiosoma moderately sclerotized, dorsum with two pairs of dorsalia, a complete dorsal plate located beneath the boundary of the anterior dorsalia, surface lightly reticulated (Figure 6 A), Cx-II and Cx-III almost connected, suture line between Cx-III / IV partly incomplete, posterior apodemes of ACG extending to one-fourth of Cx-IV, posterior projection of Cx-IV somewhat hook-shaped. Cx-IV connected in medial line (Figure 6 B). Genital field located terminally, anterior margin connected with posterior margin of Cx-IV, each with 8 – 12 acetabula. V 4, V 1 and excretory pore all incorporated into genital field (Figure 7 E). Palp five-segmented. P- 1 distally with one dorsal seta, P- 4 features two small ventral projections, located close to each other, each bearing a single seta, along with one ventrodistal peg-like seta situated on a tubercle, lateromedially with a cluster of fine bristles, distally with a dagger-shaped sclerotized extension that extends beyond P- 5 (Figure 7 A). Gnathosoma pincershaped (Figure 7 C). Chelicera with a well-developed claw (Figure 7 D). II-L- 4, 5 ventrodistally each with one swimming seta, respectively (Figure 8 B). III-L- 3, - 4, - 5 distally with one, four, three swimming setae, respectively (Figure 8 C). IV-L- 3, - 4, - 5 distally with two, five, three swimming setae, respectively. IV-L- 5 with three blunt setae and with a distinct concavity near the subterminal region. IV-L- 6 curved, with a peg-like projection at the bend, which bears a single seta, IV-L- 6 shorter than IV-L- 5. (Figure 8 D). Measurements — Male (n = 4): Idiosoma L 396 – 404, W 293 – 308 (L / W ratio 1.31 – 1.35) ; genital field L 66 – 74, W 194 – 195 (L / W ratio 0.34 – 0.38). LA 245 – 250 ; LP 175 – 196 ; medial distance between Cx-IV 0 – 1. Chelicera L 97 – 107. Gnathosoma L 89 – 113. Lengths of the palp segments (P- 1 – 5): 21 – 25, 81 – 83, 20 – 25, 64 – 66, 42 – 44. Lengths of I-L- 1 – 6: 52 – 56, 80 – 81, 84 – 89, 132 – 139, 148 – 150, 152 – 155. Lengths of II-L- 1 – 6: 55 – 58, 77 – 81, 85 – 91, 138 – 141, 158 – 164, 159 – 161. Lengths of III-L- 1 – 6: 56 – 58, 84 – 68, 65 – 66, 103 – 106, 123 – 125, 115 – 117. Lengths of IV-L- 1 – 6: 80 – 90, 83 – 85, 95 – 100, 139 – 145, 150 – 160, 99 – 101. Female: Significant differences exist compared to male. Idiosoma elliptical, with weak sclerotization (Figure 6 C), interspace between Cx-II and Cx-III wide, the mid-edge spacing of Cx-IV broad, posterior apodemes of ACG extending to one-third of Cx-IV (Figure 6 D). Genital field with a pair of genital plates, each with 12 – 15 acetabula (Figure 7 E). P- 4 lacks a cluster of fine bristles, and distal sclerotized extension reaches halfway along P- 5 (Figure 7 B). Both IV-L- 5 and IV-L- 6 appear normal, with IV-L- 6 being approximately equal in length to IV-L- 5 (Figure 8 F). Measurements — Female (n = 7): Idiosoma L 598 – 606, W 478 – 494 (L / W ratio 1.22 – 1.25) ; genital field L 86 – 90, W 65 – 76 (L / W ratio 1.18 – 1.32). Gonopore L 130 – 136. LA 329 – 347 ; LP 217 – 223 ; medial distance between Cx-IV 32 – 38. Chelicera L 120 – 127. Gnathosoma L 84 – 87. Lengths of the palp segments (P- 1 – 5): 25 – 30, 86 – 99, 36 – 41, 82 – 89, 44 – 50. Lengths of I-L- 1 – 6: 53 – 60, 90 – 102, 98 – 103, 158 – 163, 166 – 169, 159 – 161. Lengths of II-L- 1 – 6: 64 – 67, 94 – 100, 107 – 114, 160 – 180, 178 – 188, 162 – 169. Lengths of III-L- 1 – 6: 63 – 70, 80 – 82, 79 – 83, 136 – 138, 153 – 159, 153 – 168. Lengths of IV-L- 1 – 6: 80 – 92, 97 – 102, 115 – 120, 166 – 170, 192 – 205, 185 – 189.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFF7D45FE68F870FB17EEC8.taxon	discussion	Remarks — The dorsal plate of this new species, delineated by the anterior dorsalia, is an exceptionally rare feature within the genus Neumania. This unique feature sets the species apart from others in the subgenus Lemienia. Additionally, the dagger-shaped sclerotized extension at the extremity of P- 4, which extends to or even overlaps P- 5, is another uncommon characteristic. To date, the sclerotized extension structure of P- 4 has only been observed in N. megaspina. However, in N. megaspina, the extension is directed from below, whereas in this species, it extends from above.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFF7D45FE68F870FB17EEC8.taxon	distribution	Distribution — China (Shandong and Anhui Province), pond.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFB7D40FE68F8DEFBADEE9D.taxon	description	(Figures 9 – 11)	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFB7D40FE68F8DEFBADEE9D.taxon	diagnosis	Diagnosis — Idiosoma weakly sclerotized. P- 4 bears two thin setae ventrally, positioned on its tubercles. Suture line between Cx-III / IV complete, male genital field contains 8 – 9 pairs of acetabula, along with V 1, V 3, V 4, C 4, excretory pore and posterior margins of Cx-IV. IV-L- 5 without swimming seta in males.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFB7D40FE68F8DEFBADEE9D.taxon	etymology	Etymology — The specific name is from Latin word: “ flect- ” means bend, the name of this new species is derived from IV-L- 6 curved in males.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFB7D40FE68F8DEFBADEE9D.taxon	materials_examined	Material examined — Holotype: ♂ ; Diaoluo Mountain National Nature Reserve, Hainan Province, 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. Paratypes: 3 ♂♂, 4 ♀♀ ; the same data as the holotype ; GUGC.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFB7D40FE68F8DEFBADEE9D.taxon	description	Description — Male: Idiosoma weakly sclerotized, dorsum with two pairs of irregular dorsalia (Figure 9 A). Coxal plates in four groups, surface lightly reticulated, interspace between Cx-II and Cx-III narrow, suture line between Cx-III / IV complete, posterior apodemes of ACG extending to half of Cx-IV, posterior projection of Cx-IV forming the shape of a mountain mound (Figure 9 B). Genital plates wider than long, with 8 – 9 pairs of acetabula, along with V 1, V 3, V 4, C 4, excretory pore and posterior margins of Cx-IV (Figure 10 E). Palp five-segmented. P- 1 slender, mediodorsal with one seta, P- 4 with two ventral projections, each bearing one seta, and one ventrodistal peg-like seta on a tubercle, the claws of P- 5 distinctly trifurcated (Figure 10 A). Ventral apodeme of gnathosoma almost as long as dorsal apodeme (Figure 10 C). Chelicera with a well-developed claw (Figure 10 D). I-L- 4, - 5 ventrodistally each with one short swimming seta (Figure 11 A). II-L - 5 ventrodistally with one swimming seta (Figure 11 B). III-L- 3, - 4, - 5 distally with one, three, three swimming setae, respectively (Figure 11 C). IV-L- 3, - 4, - 5 distally with three, five, zero swimming setae, respectively. IV-L- 5 subterminal part has no depression but significantly narrowed, IV-L- 6 curved and much shorter than IV-L- 5 (Figure 11 D). Measurements — Male (n = 4): Idiosoma L 436 – 450, W 378 – 405 (L / W ratio 1.11 – 1.15) ; genital field L 93 – 107, W 156 – 171 (L / W ratio 0.59 – 0.63). LA 287 – 290 ; LP 202 – 210 ; medial distance between Cx-IV 0 – 4. Chelicera L 99 – 109. Gnathosoma L 73 – 80. Lengths of the palp segments (P- 1 – 5): 23 – 24, 75 – 77, 41 – 43, 73 – 77, 29 – 32. Lengths of I-L- 1 – 6: 57 – 60, 91 – 94, 103 – 107, 138 – 145, 170 – 174, 168 – 177. Lengths of II-L- 1 – 6: 62 – 64, 84 – 86, 112 – 115, 151 – 155, 179 – 186, 147 – 150. Lengths of III-L- 1 – 6: 58 – 63, 69 – 70, 89 – 91, 114 – 116, 147 – 148, 132 – 135. Lengths of IV-L- 1 – 6: 62 – 65, 88 – 91, 107 – 112, 145 – 147, 197 – 202, 138 – 140. Female: Significant differences exist compared to male (Figure 9 C), interspace between Cx-II and Cx-III wide, the mid-edge spacing of Cx-IV broad, posterior apodemes of ACG extending to one-fourth of Cx-IV, posterior projection of Cx-IV hook-like (Figure 9 D). Genital field contains 8 – 10 pairs of acetabula and 7 pairs of genital setae, five of which located on the genital plate, while two outside the plate (Figure 10 F). P- 3 and P- 4 both without lateral fine seta (Figure 10 B). IV-L- 3, - 4, - 5 distally with three, five, three swimming setae, respectively. Both IV-L- 5 and IV-L- 6 appear normal, IV-L- 6 with two ventral setae (Figure 11 E). Measurements — Female (n = 4): Idiosoma L 706 – 740, W 582 – 633 (L / W ratio 1.16 – 1.21) ; genital field L 78 – 83, W 69 – 71 (L / W ratio 1.13 – 1.16) ; gonopore L 136 – 160. LA 378 – 395 ; LP 258 – 265 ; medial distance between Cx-IV 41 – 54. Chelicera L 130 – 140. Gnathosoma L 90 – 99. Lengths of the palp segments (P- 1 – 5): 27 – 28, 94 – 103, 52 – 54, 96 – 98, 36 – 38. Lengths of I-L- 1 – 6: 71 – 74, 102 – 121, 141 – 143, 190 – 195, 205 – 206, 188 – 189. Lengths of II-L- 1 – 6: 76 – 81, 109 – 118, 124 – 127, 174 – 197, 214 – 216, 188 – 190. Lengths of III-L- 1 – 6: 72 – 77, 82 – 87, 99 – 101, 149 – 158, 199 – 201, 171 – 204. Lengths of IV-L- 1 – 6: 79 – 84, 104 – 112, 130 – 132, 182 – 184, 235 – 236, 204 – 213.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFB7D40FE68F8DEFBADEE9D.taxon	discussion	Remarks — The male genital field of the new species is located terminally. Its anterior margin connects to the center of the posterior margin of Cx-IV, while its posterior margin is fused with the excretory pore and bilateral V 1. The enlarged V 4 is fused with the genital plate through its lateral wing. The C 4 heals from the anterior margin, and V 3 connects to the anterior edge of the plate through a corridor-shaped, secondary-sclerotized edge. It is evident that the above features are rare in the entire species of the subgenus Lemienia, thus they can serve as distinguishing features. Although Neumania (Lemienia) maharashtris Cook, 1967 also exhibits a similar structure, the following features can clearly distinguish it from the new species: male IV-L- 5 of this species bears swimming setae, the suture line between Cx-III / IV is incomplete, and the dorsal seta on P- 1 is absent.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
03D287EEFFFB7D40FE68F8DEFBADEE9D.taxon	distribution	Distribution — China (Hainan Province), marsh.	en	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): 313-330, DOI: 10.24349/9qsv-3aua, URL: https://doi.org/10.24349/9qsv-3aua
