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Betta unimaculata

Betta unimaculata
One Spot Betta
This species is incredibly rare in the hobby and usually commands a high price as a result. It lends its name to the Betta unimaculata complex of closely-related congeners, an assemblage which currently includes B. patoti, B. ocellata , B. gladiator, B. ideii , B. macrostoma , B. pallifina , B. compuncta, and of course Betta unimaculata. Some members of this group can be easily confused at first glance as they appear superficially similar. The blue/green form of B. ocellata is often mistaken for Betta unimaculata for example. In their 2005 paper covering the Betta species of Singapore, Malaysia and Brunei Tan and Ng described this particular species' unique combination of characters within the group as follows: 

"distinct black spot near caudal peduncle; body brownish; uniform caudal fin colour; vertebrae 30-32 (mode 31); anal-fin rays 27-30 (mode 28-29); dorsal-fin rays 6-8 (mode 8); pectoral fin rays 12-13 (mode 12); subdorsal scales 4-5 (mode 5); lateral scales 31-33 (mode 32); predorsal scales 24-26 (mode 24); predorsal length 67.7-73.0% SL; head length 29.0-33.3% SL; length of anal-fin base 45.9-53.7% SL; length of dorsal-fin base 7.9-10.4% SL; lower jaw length 31.6-37.9% HL.