Julii Cory Catfish
Size - 55mm or 2.2" SL. Find near, nearer or same sized spp.
Identification Often you will see fish for sale as Corydoras julii but they are actually Corydoras trilineatus. So, if you bought as fish as julii, it's almost certainly C. trilineatus from the upper Amazon. The real C. julii will turn up from time to time as although it originates from the upper Parnaiba system in the lower Amazon drainage, it is found in the Rio Para where commercial fish collectors operate.
Telling them apart without locality information is actually quite hard as some C. trilineatus can show the spotted head pattern traditionally associated solely with C. julii, C. julii appears also to have a shorter horizontal mid body stripe not reaching half way along the body.
Sexing - Females bigger and fuller bodied.