Taxonomy & naming
Rainboth and Kottelat described the species in 1987 from the Lam Dom Noi Reservoir, Ubon Province, Thailand, as Rasbora spilocerca. It was later moved to Rasbosoma, which is why the authority is in parentheses. FishBase gives dwarf scissortail rasbora as its common name.
Morphology
A very small, slim rasbora reaching 1 in SL according to FishBase. The species name refers to a spot on the tail, as spilocerca means spot-tail. Other colour detail is not described in the sources the atlas uses.
Habitat
FishBase reports it near the surface in shallow marshes, swamps and inundated fields, usually in open water above beds of fine-leaved aquatic plants and submerged grasses, in clear swamps. It is listed as freshwater and benthopelagic, in tropical water, from the Mekong basin.
Feeding
It feeds on zooplankton and some insects, according to FishBase.
Mating
Mating behaviour is not described in the sources the atlas uses.
Breeding
Breeding is not described in the sources the atlas uses.
In the aquarium
FishBase says it is too small to be marketed and is rarely seen in the aquarium trade. A tank for this size should be planted and calm, with other small, peaceful fish and food small enough for its mouth.
Conservation
FishBase lists the species as Least Concern on the IUCN Red List, assessed 15 March 2011.