Figures 2–10; Erhaia jannei sp. nov., holotype (2 H 2.25 mm) and paratype (3 H 2.02 mm). Bhutan, district Thimphu, W of Geneykha, brooklet with water powered prayer wheel, 2750 m a.s.l. Photos by J. Goud Erhaia pelkiae sp. nov., holotype (4 H 1.86 mm) and paratype (5 H 1.86 mm). Bhutan, district Thimphu, W of Geneykha, brooklet with water powered prayer wheel, 2750 m a.s.l. Photos by J. Goud Erhaia wangchuki Gittenberger, Sherub & Stelbrink, 2017. Shells from the type locality (6 H 1.98 mm) (7 H 2.03 mm); NBCB 1072. Bhutan, district Wangdue Phodrang, Gangchhu, Gangzetem brooklet, 2883 m a.s.l. Photos by J. Goud 8 Erhaia banepaensis Nesemann & S. Sharma, 2007, holotype (H 1.95 mm); NHMW 103319. Nepal, Central Zone, Kavre district, small forest stream, left tributary of the Chandeswari Khola upstream from Chandeshwari at Banepa. NHMW 9 Erhaia nainitalensis Davis & Rao, 1997, holotype of E. chandeshwariensis Nesemann & S. Sharma, 2007 (H 1.94 mm); NHMW 103315. Nepal, Central Zone, Kavre district, small forest stream, left tributary of the Chandeswari Khola upstream from Chandeshwari at Banepa. NHMW 10 Erhaia sugurensis Nesemann, Shah & Tachamo, 2007, holotype (H 1.95 mm); NHMW 104172. Nepal, Central Zone, Lalitpur district, Godawari, upper reaches of Sugure Khola forest stream, 1700 m a.s.l. NHMW.
Figure 4; Reproductive anatomy. A–D F. multifarius A, B, D USNM 1144567, C USNM 1070753 E–G F. fresti, sp.n., USNM 1422223 H–J F. umpquaensis, sp. n., USNM 1144736. A, E, G Female glandular oviduct and associated structures (viewed from left side) B, C, F, I Bursa copulatrix and seminal receptacle, D, G, J Penis, dorsal surface. The bursa copulatrix and seminal receptacle of type material of F. multifarius (C), which was not illustrated by Hershler et al. (2007), is shown for comparative purposes. Scale bars, 500 µm. Ag albumen gland Bu bursa copulatrix Cg capsule gland Cov coiled oviduct Dsr seminal receptacle duct Ga genital aperture Pd penial duct Pw posterior wall of pallial cavity Sr seminal receptacle Vc ventral channel of capsule gland.