![]() We recorded ongoing courtship with still photography, audiotape recordings, and videography. ![]() Here we report laboratory observations of complete Rhyacotriton courtship that confirm that promise. Only fragments of Rhyacotriton courtship were known from past work, but they promised insights into the ancient sexual radiation of salamander families. Rhyacotriton is an ancient salamander lineage with distant relationships to Amphiuma and plethodontids and an even more distant relationship to ambystomatids and salamandrids. In this article we report the case of complex behavior used by salamanders in sperm transfer that is at least 123–153 million years old. ![]() ![]() Although many examples of behavioral homology have been documented in the vertebrate literature, these examples are skewed towards short timescales. ![]()
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