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Designed by Paul Smith 2006. This website is copyrighted by law.
Material contained herewith may not be used without the prior written permission of FAUNA Paraguay.
Material on this page was provided by Paul Smith, Sergio Rios and Sigrid Drechsel and is used with permission.
PARADOX FROG Pseudis paradoxus
A green, largely aquatic frog with greatly developed hindlimbs which act like oars to row the animal through its marshy habitat. Despite its unusual appearance, you might be surprised to hear that it is not the most interesting aspect of the frog´s biology. Its common name makes reference to the fact that the tadpoles (at some 15cm in length) are more than twice the size of the adult animal, a paradox that led early biologists to conclude incorrectly that it was the adults that metamorphosed into tadpoles and not the other way around!!!
Click on the images to enlarge them.
FIGURE 1 - (FPANF202PH) Adult male singing, Cuenca Upper Yacaré Sur, Departamento Presidente Hayes (Paul Smith October 2008).
FIGURE 2 - (FPANF203PH) Adult, Fortín Toledo, Departamento Boquerón (Paul Smith October 2009).
FIGURE 3 - (FPANF348PH) Adult dorsal view, location unknown (Sigrid Drechsel www.pybio.org).
FIGURE 4 - (FPANF349PH) Same individual as (FPANF348PH) head detail (Sigrid Drechsel www.pybio.org).
FIGURE 5 - (FPANF475PH) Adult dorsal, Estancia Cerrito, Departamento Alto Paraguay (Sergio Rios July 2011).
FIGURE 6 - (FPANF476PH) Same individual as (FPANF475PH) ventral (Sergio Rios July 2011).
Pseudis paradoxus Click the links to hear the calls.
1 (FPANF204RE) Song Recorded Cuenca Upper Yacaré Sur, Departamento Presidente Hayes (Paul Smith October 2008)