The mailed catfish Planiloricaria cryptodon (Isbrücker, 1971) was hitherto only known from the holotype from Río Ucayali, Peru. New material from Rio Purus (Est. Acre, Brazil) and from Río Mamoré (Prov. Beni, Bolivia) is described and compared with the holotype. One of the new specimens is illustrated. A key to the genera of the subtribe Planiloricariina (tribe Loricariini of the subfamily Loricariinae) is added.

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Journal Bijdragen tot de dierkunde
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Citation
Isbrücker, I.J.H, & Nijssen, H. (1986). New records of the mailed catfish Planiloricaria cryptodon from the upper Amazon in Peru, Brazil and Bolivia, with a key to the genera of the Planiloricariina. Bijdragen tot de dierkunde, 56(1), 39–46.