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Let's cover male/female geoffroy/ornatus/choati all at once here. The characteristics of sex are not all that different amongst these three species.
M. geoffroy
facial pattern - continuous lines formed on male, broken lines on female
dorsal - males develop a large red spot at doral anterior
Older males lose the blue "background" on the body
Male:
Photo credit: Fishbase.org
Female:
Photo credit: Fishbase.org
M. ornatus
facial pattern - continuous lines formed on male, broken lines on female
anal fin - males develop a bold/wide nearly straight line, which has morphed from the zigzag line females posses
dorsal fin - similar pattern shift; males develop a continuous line in the dorsal; also gets a bright spot at the anterior
body pattern - the pattern becomes very uniform in the male
body color - males shift to a predominant green morphing from the more predominant brown female coloration
Male:
Photo credit: Fishbase.org
Female:
Photo credit: Fishbase.org
M. choati
anal fin - males develop a continuous line on the anal fin, morphing from the broken spots of the female (towards the body) - this is the most clear way to tell male/female apart here
facial coloration - older males do have more "blue" in the face between the orange stripes, but this is hard to distinguish on younger males.
Male:
Photo credit: Fishbase.org
Female:
Photo credit: H. Tanaka
M. geoffroy
facial pattern - continuous lines formed on male, broken lines on female
dorsal - males develop a large red spot at doral anterior
Older males lose the blue "background" on the body
Male:
Photo credit: Fishbase.org
Female:
Photo credit: Fishbase.org
M. ornatus
facial pattern - continuous lines formed on male, broken lines on female
anal fin - males develop a bold/wide nearly straight line, which has morphed from the zigzag line females posses
dorsal fin - similar pattern shift; males develop a continuous line in the dorsal; also gets a bright spot at the anterior
body pattern - the pattern becomes very uniform in the male
body color - males shift to a predominant green morphing from the more predominant brown female coloration
Male:
Photo credit: Fishbase.org
Female:
Photo credit: Fishbase.org
M. choati
anal fin - males develop a continuous line on the anal fin, morphing from the broken spots of the female (towards the body) - this is the most clear way to tell male/female apart here
facial coloration - older males do have more "blue" in the face between the orange stripes, but this is hard to distinguish on younger males.
Male:
Photo credit: Fishbase.org
Female:
Photo credit: H. Tanaka
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