FIGURE 1. The relationships among the 11 in The status of the amphibian nomina created by Merrem (1820) and Ritgen (1828)

FIGURE 1. The relationships among the 11 genera of amphibians recognized by Merrem (1820) according to the cladistic interpretation of Frost et al. (2006), mainly based on molecular data. Generic nomina between square brackets are those used in Merrem (1820); each of them is preceded by the current valid nomen of the genus (see Table 1). Codes that follow these nomina at the end of each line are those used to designate the taxa including these genera in Merrem's classification (see Table 2). Codes T1 to T6 on the branches of the tree allow to recognize the taxa they designate in Table 4.