Oryzias hadiatyae, a new…

A new species of ricefi sh is described from Lake Masapi, a small satellite lake of the Malili 
Lakes system in Central Sulawesi, Indonesia. Oryzias hadiatyae, new species, is known only from this 
single lake. It differs from all other adrianichthyids in Sulawesi in having a well marked concavity on the 
snout, a slender but relatively wide body with elongated snout and slightly upwardly directed mouth, pelvic 
fi ns with 5–6 fi n rays and anal fi n with 19–22 fi n rays, both inserting relatively close to the rear end of the 
body, dorsal fi n with 8–10 rays inserted above 10–12th anal fi n ray, 28–30 vertebrae, only 27–31 lateral 
scales, dark brown blotches on the lateral body in adult males, and no blotches in females. This brings the 
number of ricefi sh species in Sulawesi to 16 (four Adrianichthys, 12 Oryzias), with four endemic lacustrine 
Oryzias in the Malili Lakes system. In addition, the riverine ricefi sh Oryzias celebensis, known so far only 
from Sulawesi’s southwestern arm and a single river in East Timor, is here reported for the fi rst time from 
a drainage in Central Sulawesi.