Lysapsus limellum
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Uruguay Harlequin Frog

It's crazy that this little water-dwelling frog, which looks very much like a Ranid, is taxonomically a treefrog. Where are the toe pads? Why isn't it climbing in vegetation?
Crazy I tell you!
Online references:
- Lysapsus limellum account on AmphibiaWeb
- Lysapsus limellum account on iNaturalist
- Lysapsus limellum account on Amphibian Species of the World