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Betta burdigala

Betta burdigala
Red Brown Dwarf Betta
Betta burdigala is exceptionally rare in the hobby with most of the fish seen on sale or pictured as such turning out to be B. uberis or other congener. It is included in the Betta coccina group/complex of closely-related species which at time of writing also includes B. brownorum , B. livida , B. miniopinna, B. persephone , B. rutilans , B. tussyae and B. coccina . These are all small fish and with the exceptions of B. persephone and B. miniopinna are predominantly red in colour. Identifying some of them correctly is not always easy as their patterning can be both similar and confusingly variable. 

Of the group Betta burdigala is most similar to B. uberis in appearance and these two can be very difficult to distinguish from one another. Some forms of B. uberis possess an iridescent blue/green lateral blotch and may be more easily mistaken for other species such as B. brownorum and B. coccina whereas others exhibit almost identical patterning and can only be separated by minor merisitic traits. Both species also have a noticeably shorter, more rounded snout when compared with other Betta species. When describing B. uberis in 2006 Tan and Ng noted the following: 

"Betta uberis is most similar to Betta burdigala from Bangka Island, in sharing the long dorsal-fin base and presence of iridescent green streaks on dorsal, caudal and anal fins. However, B. uberis can be differentiated from Betta burdigala by the following characters: presence (not always) of iridescent green mid-lateral body patch in males (vs. absence, always); more dorsal-fin rays (14-17, vs. 14-15); more subdorsal scales (12-13½, vs. 11-11½); more predorsal sclaes (18-20, vs. 15-16); more postdorsal scales (9-11, vs. 8); smaller postdorsal length (13.5-17.8 % SL, vs. 19.1-23.5); longer dorsal-fin base (30.0-37.2 % SL, vs. 26.8-28.6); smaller postorbital length (13.4-16.8 % SL, vs. 16.7-17.4); and smaller snout length (29-42 % postorbital length, vs. 42-45)."