Lubricogobius, Tanaka, 1915

A diagnostic key to the 7 species of Lubricogobius View in CoL in the Indo-Pacific

1a Anterior nostril absent, color of body in life white dorsally, abruptly orange ventrally......................... L. dinah

1b Anterior nostril present, color of trunk in life uniformly pinkish, creamy white, yellow or orange...................... 2

2a Second dorsal rays modally 10–11........................................................................ 3

2b Second dorsal rays modally 9............................................................................ 4

3a Pectoral fin ray modally 19; head and body uniformly light brown to brown................................. L. nanus

3b Pectoral fin rays 18; color of head with an oblique orange red stripe through eyes, and caudal fin with wide, distal deep black margin............................................................................ L. rubrofasciatus sp. n.

4a Pectoral rays modally 17; anal rays modally 6........................................................ L. exiguus

4b Pectoral rays modally 18–19; anal rays 7–8................................................................. 5

5a Pectoral fin modally 18........................................................................ L tunicatus

5b Pectoral fin modally 19................................................................................ 6

6a anal fin rays modally 7; color orange with several light blue lines radiating from eye and two lines on operculum (Ryukyu Islands, Vietnam, Arafura Sea, and New Caledonia)................................................... L. ornatus

6b anal fin rays 8; color of body pinkish and first dorsal fin entirely black........................................ L. tre