back to comparative morphology Ancient frogs Hyloides branches Bufonids part I Bufonids part II Ranoides part I   Acris crepitans Northern cricket frog family: Hylidae Hyla femoralis Pine-woods treefrog family: Hylidae

Smilisca baudinii Mexican treefrog family: Hylidae

Smilisca fodiens Northern burrowing treefrog family: Hylidae

Here are four hylids with conspicuous caudal extensions. In each case, the papillar chamber accommodates the papillar extension by continuing in the posterior direction-- well past the transected nerve branch.