Parosphromenus opallios
Parosphromenus opallios is a species of gourami. It is native to Asia, where it is known only from the Kalimantan region of Indonesia. The species reaches in standard length and is known to be a facultative air-breather. Its specific epithet is derived from Greek and references the gemstone opal. Although present in the aquarium trade, it is noted to be uncommon.