What kind of Hoplias is this?? Plz help with identification

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Yeah i red this wolf pack page, but never thought of this dark spot as a membrane. But for example this aimara seems to lack it?

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But i think i see the differences in the shape of the head now clearer.
 
In sure it has it in the pic but the way gills are flared and turning of the body and maybe the reason can't see it.
 
In sure it has it in the pic but the way gills are flared and turning of the body and maybe the reason can't see it.
+1, and it's harder to see since amapa aimaras are dark as it is
 
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