Barito Betta

This species can reach a length of 6.6 centimetres (2.6 in) SL. The dorsal fin has seven to nine soft rays, the pectoral fin eleven to fourteen and the anal fin twenty-seven to thirty-two. There are thirty-two to thirty-four scales along the lateral line. Coloring is very vivid, especially in the males. They are a tan/brown, with green and blue iridescence, more noticeable in the males. Adult males' gill plates are adorned with metallic scales that range from sky blue to gold, depending on the lighting. They have a black spot on the base of their caudal fins which are lanceolate in shape. Females have a hyaline band near the outer edges of their anal and caudal fins.

Betta pallifina is only known from clear forest streams in the upper Barito River basin in Central Kalimantan, Indonesia. These streams have soft sandy or leaf-litter bottoms with dense marginal plants and patches of aquatic vegetation. The water temperature in which these fish are found is typically 77–79 °F (25–26 °C), with the pH ranging from 6.6 to 7.4.

Betta pallifina are a mouthbrooding species of betta. The male is the caretaker, holding the fry in his mouth for up to three weeks. In captivity, these fish are very easy to breed. During spawning, which can take several hours, the male embraces the female. Fertilized eggs are gathered into the male's mouth and he retreats to brood the fry when spawning is complete. Parents do not predate the fry when they are released.