The black-nostril false moray, blacknose false moray, or blacknose reef eel, Kaupichthys atronasus, is an eel in the family Chlopsidae. It was described by Leonard Peter Schultz in 1953. It is a tropical, marine eel which is known from throughout the Indo-Pacific, including the Chagos Islands, Samoa, the Ryukyu Islands, the southern Great Barrier Reef, and Micronesia. It typically dwells in coral reefs at a depth of 12-15 m. Males can reach a maximum total length of 12 cm. The black-nostril false moray is considered an uncommon species.