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{{Short description|Species of fish}}{{Speciesbox| taxon = Panaque bathyphilus| display_parents = 3| authority = Lujan & Chamon, 2008}Panaque bathyphilus is an Amazonian species of armoured catfish from the family Loricariidae.JOURNAL, Lujan, Nathan. K., Chamon, Carine. C., Two new species of Loricariidae (Teleostei: Silurifomes) from main channels of the upper and middle Amazon Basin, with discussion of deep water specialization in loricariids, Ichthyological Exploration of Freshwaters, 2008, 19, 3, 271–282,weblink 16 August 2014, The holotype of the species was collected in the Solimões River, upstream of its confluence with the Purus River. This species has been known in the aquarium trade, at least since 1992,WEB, Schraml, Erwin, New imports: Three new Loricariids,weblink 16 August 2014, as papa panaque or under the L-number code L090.BOOK, Schraml, Erwin, Schäfer, Frank, Loricariidae: all L-numbers, 2004, Aqualog, Germany, 3-936027-51-X, 9, 84–85,weblink 16 August 2014,weblink" title="web.archive.org/web/20140727232813weblink">weblink 27 July 2014, dead, WEB, Panaque bathyphilus,weblink PlanetCatfish, 5 May 2017, It reaches up to about {{convert|40|cm|in|abbr=on}} in length.This species, Peckoltia pankimpuju, Panaqolus nix, Loricaria spinulifera and L. pumila are the only loricariid catfish species known to occur in a deep water form with reduced pigment and eyes (similar to cavefish), and another "normal" form in shallower waters.JOURNAL, Cramer, C.A., L.H.R. Py-Daniel, 2015, A new species of Panaqolus (Siluriformes: Loricariidae) from the rio Madeira basin with remarkable intraspecific color variation, Neotrop. Ichthyol., 13, 3, 461–470, 10.1590/1982-0224-20140099, free, JOURNAL, Thomas, M.R., L.H.R. Py-Daniel, 2008, Three new species of the armored catfish genus Loricaria (Siluriformes: Loricariidae) from river channels of the Amazon basin, Neotrop. Ichthyol., 6, 3, 379–394, 10.1590/S1679-62252008000300011, free, P. bathyphilus and a few other loricariid catfish species of the mainstream of large South American rivers have greatly elongated streamers on their tail. It is speculated that this may serve as an early warning system against the large predatory catfish that also roam their habitat. Positioned with the head towards the water current, as typical of loricariid catfish, the long tail streamers of P. bathyphilus are the first to be contacted by a large predator that hunts against the current, perhaps allowing it to escape.

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