We provide data on morphological characteristics and the distribution of the nemipterid fish Nemipterus marginatus (Valenciennes, 1830) in the estuary and coastal area of Thanh Hoa province, North Central Vietnam. This is also a clear location record for the distribution of this species in the North Central region compared to previous studies, and a new record for the study area.

‘Henicorhynchus’thaituisp. nov. is described from a subterranean stream in a karst cave in Phong Nha Ke Bang National Park, Quang Binh Province, Central Vietnam. It differs from all congeners in having a pale pink body in life, smaller eyes with diameter less than the maxillary barbel length, and two pairs of barbels, the maxillary barbel being much longer than the rostral barbel.