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Oryzias woworae

Oryzias woworae
Blue Daisy Ricefish
This species first appeared in the hobby shortly after being described to science and caused something of a sensation with initial prices very high. It can be told apart from all described members of the genus by colour pattern, though there is at least one similar-looking fish which may turn out to be an undescribed species (see below). The caudal fin is also truncate, rather than lunate or emarginate, in shape which distinguishes it from the congeners O. bonneorum, O. nebulosus, O. nigrimas, O. orthognathus, and O. sarasinorum , and in this respect appears to be a member of a large, unnamed clade or 'species group' containing all other members of the genus. 

However, it also possesses a hour-glass shaped, as opposed to rounded, ossified portion of the mesethmoid with no cartilage on its midlateral margins, a feature not observed in the other species of that clade and instead shared with some of the larger, pelagic species from Sulawesi such as O. bonneorum. It's phylogenetic position is thus somewhat ambiguous based on current knowledge. 

There is another, near-identical fish collected from close to the city of Kendari on the Sulawesi mainland and traded as O. sp. 'Kendari', O. sp. 'neon' or O. sp. 'Sulawesi'. It is slightly more elongate and exhibits some differences in colour compared with O. woworae, including a lesser degree of blue on the flanks, more purplish spawning colouration in males, less red on the lower jaw (completely absent in some specimens), no red on the abdomen in males, no red above the anal fin in females (H-G. Evers, pers. comm.) less brightly-coloured eye and a little blue in the unpaired fins (not present in O. woworae).