[ < rufo-comb. form + testaceousadj., after post-classical Latin rufo-testaceus (1788 or earlier)]
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1808 Trans. Linn. Soc.9 45 The thighs of the clover weevil are rufo-testaceous.
1960 Amer. Midland Naturalist64 45 The carabid beetles of the subgenus Rhadine Leconte are..uniformly testaceous, rufotestaceous, or dark ferrugineous.