Vertebrate Zoology 62 (3) 2012 387 387 – 397 © Museum für Tierkunde Dresden, ISSN 1864-5755, 19.12.2012 Betta siamorientalis, a new species of bubble-nest building fighting fish (Teleostei: Osphronemidae) from eastern Thailand CHANON KOWASUPAT 1, BHINYO PANIJPAN 2 *, PINTIP RUENWONGSA 2 & TADSANAI JEENTHONG 1, 3 1 Institute for Innovative Learning, Mahidol University, 999 Phuttamonthon 4 Road, Salaya, Nakhon Pathom 73170, Thailand.
[email protected] 2 Faculty of Science, Mahidol University, 272 Rama 6 Road, Phayathai, Bangkok 10400, Thailand.
[email protected],
[email protected] 3 Thailand Natural History Museum, Pathum Thani 12120, Thailand.
[email protected] * Author to whom correspondence should be addressed.
[email protected] Accepted on November 05, 2012. Published online at www.vertebrate-zoology.de on December 10, 2012. > Abstract Betta siamorientalis sp. n., a new species of fighting fish belonging to theBetta splendens group, inhabiting four provinces in the eastern Thailand, is described. The combination of slender body shape with reddish vertical bars on the black opercle and an apparent black body distinguishes the new species from other congeners especially B. imbellis. The blacker appearance relative to B. imbellis is due to a higher proportion of black body area relative to that occupied by blue/green iridescence of the scales. Based on morphological similarity and fin colour pattern and vertical bar colour on the opercle, the new species appears to be more closely related to B. imbellis and B. splendens than other members of the B. splendens group. > Key words Betta siamorientalis sp. n., Black imbellis, Bubble-nesting fighting fish, Thailand. Introduction Based on behaviourial and morphological charac- These members are B.