Calton M S, Denton T E
Science. 1974 Aug 16;185(4151):618-9. doi: 10.1126/science.185.4151.618.
The chocolate gourami, Sphaerichthys osphromonoides, has the lowest chromosome number reported for fishes, with 2n = 16 and n = 8. Other members of the family Belontiidae have somatic numbers of 42 to 48. Chromosome instability is demonstrated by the presence of somatic abnormalities and meiotic multivalents.
巧克力斗鱼（Sphaerichthys osphromonoides）拥有鱼类中已报道的最低染色体数，其二倍体数为2n = 16，单倍体数为n = 8。斗鱼科的其他成员体细胞染色体数为42至48。体细胞异常和减数分裂多价体的存在表明了染色体的不稳定性。
