Lemienia Koenike, 1910

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

Subgenus Lemienia Koenike, 1910

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.

Distribution — The Afrotropical, Palaearctic, Australian and Oriental regions.

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.