Fig. 2 in A relict stem salamander: evidence from the Early Cretaceous of Siberia

Fig. 2. Simplified relationships and temporal ranges of stem- and crowngroup salamanders. Stem salamanders are represented only by Karauridae (i.e., Kokartus + Karaurus). A, stratigraphic placement (Bathonian) of the stem salamander Kokartus (note that the stem salamanders Marmorerpeton, "Kirtlington salamander A", Urupia, and "Berezovsk salamander A" have the same stratigraphic placements). B, stratigraphic placement (Kimmeridgian) of Karaurus (note that salamanders "cf. Marmorerpeton" from Portugal and the possible "stem salamander" from the USA have approximately the same stratigraphic placements). C, stratigraphic placement (Aptian–Albian) of the stem salamander Caudata, Gen. et sp. indet. reported here from the Shestakovo locality and possible stem salamanders from the Cloverly Formation of USA.