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. 2009 Oct 15;4(10):e7477. doi: 10.1371/journal.pone.0007477

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Seney et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Phallus length, UM volume, IC volume, and LA attachment sites were all sexually dimorphic in silvery mole-rats (SMR). These traits were not significantly dimorphic in naked mole-rats (NMR). In Damaraland mole-rats (DMR), an intermediate pattern was seen: phallus length and UM size were dimorphic, but IC volume was monomorphic. LA attachment sites were mixed in male DMRs, but more similar to that of NMR. (B) Anogenital distance is sexually dimorphic in all African mole-rats examined, but followed an opposite pattern in naked mole-rats (F>M) compared to Damaraland or silvery mole-rats (M>F). The bulb of penis is present in silvery mole-rats, while absent in naked mole-rats. Damaraland mole-rats have a small bulb of penis.