Ngoc-Son Tran, Thi Tuong Vi Nguyen & Anton Brancelj

Abstract. The family Phyllognathopodidae has so far been represented by two species in Southeast Asia. Intensive research on the hyporheic zone of the Suoida stream near Da Nang City, central Vietnam, reveals a rich fauna of Copepoda. As a result, a new species of the genus Phyllognathopus, P. vietnamensis, new species, was collected. According to the morphological characters of P4 Exp being two-segmented in this genus, P. vietnamensis (both males and females were collected) belongs to the P. chappuisi group. Both male and female specimens differ from its congeners on armature and the shape of P5, the armament of free margin of anal operculum as well as the shape and position of caudal seta III.

Key words. hyporheic zone, Southeast Asia, stygobites, Phyllognathopodidae, taxonomy, Vietnam

Read article here: RBZ-2025-0021