grammodes genus?

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I see what you mean. Taxonomists have such different standards for what makes two species similar enough for two lump them together in the same genus. Some focus on appearance, some more based on feeding and behavior. Nowadays they prefer to do it genetically and I do not know how much interest there is to sort out the handful of Central American species that don't really have a taxonomic home.
 
Great observations. But I think the best way is thru genetic testing. It is like in humans where everyone has a twin but yet no relation what so ever.
 
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