edburress;2857760; said:Geophagus winemilleri have an opercular mark.
Geophagus parnaibae are a much different fish, mostly blue and green and comparatively unattractive. You can read the original description and view images of the Holotype and a Paratype here...
http://globiz.sachsen.de/snsd/publikationen/Zool_Abh/zool_abh_55_2005_69-75.pdf
I agree with Geophagus abalios. You can read the original description and view the Holotype (pg 14) and a Paratype (pg 15) here...
http://txspace.tamu.edu/bitstream/handle/1969.1/1129/etd-tamu-2004B-WFSC-Lopez-2.pdf
The Holotype for G. winemilleri is also on page 32 and a Paratype is on 33.
Peter it is a very nice fish! I am jealous!
Ed