Rhinogobius, Gill, 1859

Diagnostic key to all nominal species of Rhinogobius View in CoL with longitudinal infraorbital papillae pattern from Fujian Province, PR China

1a Pectoral fin rays modally 19–20, predorsal scales 10–16................................. R. leavelli (All main basins)

1b Pectoral fin rays no more than 18; predorsal scales no more than 10............................................. 2

2a Vertebrae 28................................................................ R. ponkouensis (Hanjiang basin)

2b Vertebrate 26–27...................................................................................... 3

3a Longitudinal scale rows 33–34; cheek entirely blackish brown striped in male.......... R. lianchengensis (Minjiang basin)

3b Longitudinal no more than 32; cheek no such mark in male.................................................... 4

4a Cheek with many rounded spots, branchiostegal membrane with several parallel red stripes in male................................................................................................. R. reticulatus (Minjiang basin)

4b Cheek and branchiostegal membrane without such marks...................................................... 5

5a Pore ω1 present, pectoral fin base with reticulated orange pattern in male............ R. xianshueiensis (Mulan River basin)

5b Pore ω1 absent, pectoral fin base without such pattern in male.................................................. 6

6a Infraorbital stripe long and well extending downward to rear edge of both jaws or ventral edge of cheek in male.......... 7

6b Infraorbital stripe/mark absent or short and not extending ventrally to rear edge of both jaws in male................... 8

7a Cheek with a conspicuous arrow-shape, red to reddish brown infraorbital mark always following by 4 oblique dark stripes in male........................................................................... R. sagittus (Minjian basin)

7b Cheek with 2–4 oblique dark stripes in male................................................................ 9

8a Pectoral fin rays modally 17; 27 vertebrae; cheek with 3 thin black lines and blackish brown infraorbital stripe in male............................................................................... R. changtinensis (Hanjiang basin)

8b Pectoral fin rays modally 16; 26 vertebare; cheek with 2 thin brown lines and bright red infraorbital stripe in male.................................................................................. R. rubrolineatus (Minjiang basin)

9a Longitudinal scale rows 25–27; 26 vertebrae; branchiostegal membrane spotless in male.................................................................................................... R. longtongyanensis (Dongshi basin)

9b Longitudinal scale rows 28–32; 27 vertebrae; branchiostegal membrane with orange to red rounded spots in male........ 10

10a Predorsal scales modally 9; cheek with 4 oblique thin black stripes; caudal fin with central yellowish mark............................................................................... R. jangshiensis new species (Jangshi basin)

10b Predorsal scales modally 7; cheek with 3 oblique thin black stripes; caudal fin without such mark............................................................................................... R. lognyanensis (Julongjiang basin)