Monstrodesmus flagellifer sp. n., ♂ paratype; A, D anterior body part, lateral and dorsal views, respectively B, E, H midbody segments, lateral, dorsal and ventral views, respectively C, F, I posterior body part, lateral, dorsal and ventral views, respectively G, K head, frontal and ventral views, respectively J cross-section of a midbody segment, caudal view L antennomeres 4-8, sublateral view; tergal seta M tegument structure, limbus and stricture region N tergal seta, lateral view O ozopore region of a midbody segment, sublateral view. Scale bars: A–J 0.1 mm; K, L 0.05 mm; M–O 0.01 mm.