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Physopyxis lyra are usually found in sites with accumulated organic debris, such as the dense tangles of roots of floating macrophytes that are abundant in rivers with turbid water. They can also be found in submerged leaf litter and among root mats of riparian plants, such as Symmeria paniculata (Polygonaceae). Observations of captive specimens suggest that P. lyra are predominantly nocturnal and spends most of the day hidden among submerged root mats or buried in sand.
188 measured individuals ranged between 17 and 40 mm total length (including tail) and 13 to 31 mm standard length (excluding tail) (Sousa and Rapp Py-Daniel, 2005).