Morrone J.J. 1994. Systematics, cladistics, and biogeography of the Andean weevil genera Macrostyphlus, Adioristidius, Puranius, and Amathynetoides, new genus (Coleoptera: Curculionidae) // American Museum Novitates. № 3104. P. 1-63. (Описания: M. bilbo - с. 7; M. gandalf и M. frodo - с. 9.)
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