"Retrodesmus cavernicola" ♀ subadult, paratype; A, D anterior body part, dorsal and lateral views, respectively B midbody segments, dorsal view C, E, G posterior body part, dorsal, lateral and ventral views, respectively F head, ventral view H cross-section of a midbody segment, caudal view I tergal seta J, K paratergite 15, dorsal and subcaudal views, respectively L limbus, dorsal view. – Scale bars: A 0.5 mm; B–E, G, H 0.2 mm; F, J, K 0.1 mm; I, L 0.02 mm.