Neumania (Lemienia) megaspina 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 : 316-318

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

( Figure 2 )

Neumania (Neumania) megaspina Jin, 1997: 124

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.

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.

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 2E ), 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 2F ). 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 2A–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.

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.

Distribution — China (Guizhou Province), stream.

Figures

Figure 2 Neumania (Lemienia) megaspina (Female A–F): A – I-L-1–6; B – II-L-2–6; C – III-L-2–6; D – IV-L-1–6; E – Palp; F – Genital field; Scale bars = 100 μm.