Gymnochanda, Fraser-Brunner, 1955

Hui, Tan Heok, Taxonomy, Kelvin Lim Kok Peng, species, new, Gymnochanda, dimorphism, sexual & Asia, Southeast, 2014, Gymnochanda ploegi, a new species of ambassid glassperch from West Kalimantan, Indonesia, Raffles Bulletin of Zoology 62, pp. 688-695 : 689

Key to the species of Gymnochanda

(based on a series of mature male specimens, either living or freshly dead; with the exception of G. limi where only one specimen is currently known)

1. Modification and elongation of second dorsal and/or anal fin rays into free filaments (up to three times SL)...................... 2

1 *. Elongation and expansion of second dorsal and anal fin rays continuous with interradial fin membrane (not exceeding caudal fin tip) ..........................................................................4

2. Extension and elongation of both second dorsal and anal fin rays; more than 2 preorbital ridge serrae; more than 3 supraorbital serrae........................................................................................ 3

2 *. Extension and elongation of only the second anal spine (reaching end of anal fin); 2 preorbital ridge serrae; 3 supraorbital serrae; recorded from Central Sumatra ..................................... ........................................... Gymnochanda limi Kottelat, 1995

3. Adult size up to 32 mm SL; filamentous rays light red to white; second spine of first dorsal fin up to 2.5 times of first spine; hyaline first dorsal fin; white pelvic fins; 3 preorbital serrae; 8 supraorbital serrae; recorded from Peninsular Malaysia, Central Sumatra and West Kalimantan..................................... .................... Gymnochanda filamentosa Fraser-Brunner, 1955

3 *. Adult size up to 22 mm SL; filamentous rays bright red; body suffused with red pigments; second spine of first dorsal fin up to 3 times of first spine; reddish first dorsal fin; red pelvic fins; 4 preorbital serrae; 5 supraorbital serrae; recorded from Central Kalimantan .......................................................... ....................................... Gymnochanda flamea Roberts, 1994

4. Caudal fin lobes with red tips; elongated dorsal and anal fin profile triangular; deeper body (body depth at anus 35.3-40.0 % SL); 3 preorbital ridge serrae; 7 supraorbital serrae; recorded from Belitung Island ................................................................. .................................... Gymnochanda verae Tan & Lim, 2011

4 *. Caudal fin suffused with light red; elongated dorsal and anal fin profile crescentic; less deep body (body depth at anus 30.1- 33.8 % SL); 4 preorbital ridge serrae; 12 supraorbital serrae; recorded from West Kalimantan ............................................... .......................................... Gymnochanda ploegi , new species