[1][2] Calotriton and Triturus are estimated to have split approximately 8 myr ago.

This may have been associated with adaptation to fast-running, well-oxygenated mountain streams (instead of ponds in Triturus), leading to some superficial similarity with Euproctus in convergent evolution: strongly depressed head and body, and reduction or even absence of lungs.

[3] Calotriton are small- to medium-sized newts, 70–167 mm (2.8–6.6 in) in total length.

Skin is covered with tubercles bearing horny tips, more so above than beneath, which can be completely smooth.

Tail is about as long as head and body and compressed from side; longer in females and deeper in males.