Unionicola subg. Unionicola Haldeman, 1842

Ding, Zhuhui, Jin, Daochao, Guo, Jianjun & Yi, Tianci, 2019, Three new species of the subgenus Unionicola Haldeman, 1842 (Acari, Hydrachnidia, Unionicolidae) from Guizhou, China, Zootaxa 4658 (1), pp. 141-154 : 142

Unionicola subg. Unionicola Haldeman, 1842

Diagnosis. Genital field with 5 or 6 pairs of acetabula. Palps not flattened, well sclerotized. Without sexual dimorphism in legs, I-II-L with large blunt setae associated with basal projections of the segment surface, III-IV-L with swimming setae. Males with one pair of genital plates forming a rounded genital field. Females with two pairs of genital plates, each with 2–3 acetabula. Anterior genital plates of female each with two and posterior plates with one long inner setae. ( Gerecke et al. 2016)