Page "Phodopus" Paragraph 8
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As shown in the cladogram, Phodopus roborovskii is sister to Phodopus campbelli + Phodopus sungorus.
The validity of P. campbelli as a species has been controversial.
Some biologists consider it to be a subspecies of P. sungorus.
Neumann et al.
determined that, at least for cytochrome b, P. campbelli and P. sungorus do not display the level of genetic divergence characteristic of sister rodent species.
Both taxa have 2n = 28 chromosomes.
However, evidence from hybridization with P. sungorus has suggested to some researchers that they are in fact separate species.
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