Praealticus bilineatus

Praealticus bilineatus is a combtooth blenny species found in the coral reefs of the western Pacific Ocean, particularly in the South China Sea. Divers can identify this species by its elongated body and distinctive greyish-brown coloration, adorned with small white spots. Its dorsal fin is deeply notched, and its median fin features white dots. The species lacks nape cirri and has smooth upper and lower lip margins. The occipital crest is more pronounced in males, and the last dorsal ray is connected to the caudal peduncle by a membrane. Praealticus bilineatus can grow up to 9 cm in total length. This blenny inhabits shallow marine environments, typically found at depths ranging from 0 to 6 meters, although it has been recorded at depths up to 20 meters. It is often seen around exposed rocky shores, where it can engage in facultative air-breathing. The species is oviparous, with eggs that are demersal and adhesive, attaching to substrates via a filamentous pad. Larvae are planktonic and inhabit shallow coastal waters. Divers may encounter Praealticus bilineatus while exploring coral reefs and rocky areas. The species is harmless to humans and is classified as Least Concern by the IUCN. Observing this blenny can provide insight into the diverse marine life of the western Pacific's coral ecosystems.