Crested v. Spinifex Pigeon taxonomy

[Syd Curtis <>]

I received via email from W A, a lovely photo of a pigeon with a crest.  The 
email did not name it.  Checked my bird books and decided it is a Spinifex 
Pigeon (Geophaps plumifera)

 I was intrigued to note how similar in appearance it is to the crested pigeon 
(Ocyphaps lophotes), and mystified to see that they are in different genera.

Is there a taxonomist out there who can explain for me (in lay language) why 
this is so?

T I A

Syd Curtis
(in Brisbane)
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