Neumania (Lemienia) heterotaxis Jin, 1997

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 : 314-316

Neumania (Lemienia) heterotaxis Jin, 1997 comb. nov.

( Figure 1 )

Neumania (Neumania) heterotaxis Jin, 1997: 122

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.

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.

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 1F ), 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 1E ). 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.

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.

Distribution — China (Yunnan Province), rice fields.

Figures

Figure 1 Neumania (Lemienia) heterotaxis (Female A–F): A – I-L-1–6; B – II-L-1–6; C – IIIL-1–6; D – IV-L-1–6; E – Palp; F – Genital field; Scale bars = 100 μm.