## Table 1 |
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Summary of previous molecular divergence estimates |
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Analysis |
Material |
No. of squamate taxa |
Dating software and/or method |
Age crown Lepidosauria |
Age crown Squamata |

Albert et al. [38] | mtDNA (13 genes) | 27 | r8s, Penalized Likelihood | 289±5 | 281 |

Albert et al. [38] | mtDNA (13 genes) | 27 | “Multidivtime”, Bayesian autocorrelated clock | 272±20 | 259 |

Alfaro et al. [3] | nDNA: RAG-1 | 35 | BEAST, Bayesian uncorrelated lognormal clock | 246 (208-275) | mid TR - mid JU |

Gorr et al. [40] | α haemoglobin chains | 3 | 6 | Strict clock (least-squares regression) | 233 | n/a |

Gorr et al. [40] | β haemoglobin chains | 9 | Strict clock (least-squares regression) | 226 | ~194 |

Hipsley et al. [42] | mtDNA and nDNA (5 genes) | 40 ^{1} |
TreeTime, Bayesian uncorrelated lognormal clock | 238±10 | n/a |

Hugall et al. [36] | nDNA: RAG-1 | 36 | r8s, Penalized Likelihood | 250-268±12 ^{2} |
171-190* ±14 |

Hugall et al. [36] | nDNA: RAG-1, translated | 36 | r8s, Penalized Likelihood | 261-275±17 ^{2} |
184-201* ±19 |

Janke et al. [48] | mtDNA | 2 | Strict clock (after pruning of taxa) | n/a | 294 ^{3} |

Kumar and Hedges [35] | Amino acid sequences (5 genes) | ? | Strict clock (after pruning of heterogeneous sequences) | 276±54.4 | n/a |

Kumazawa [37] | mtDNA | 24 | “Multidivtime”, Bayesian autocorrelated clock | ~260-290 | ~215-255 |

Mulcahy et al. [43] | mtDNA and nDNA (RAG-1) | 64 | BEAST, Bayesian uncorrelated lognormal clock | ~233 (223-243) | 180 (160-198) |

Mulcahy et al. [43] | mtDNA and nDNA (RAG-1) | 64 | r8s, Penalized Likelihood | ~275 (na) | 191.8 (186-194) |

Okajima & Kumazawa [49] | mtDNA | 22 | “Multidivtime”, Bayesian autocorrelated clock | n/a | 240 (220-260) |

Pyron [39] | nDNA: RAG-1 ^{4} |
44 | BEAST, Bayesian uncorrelated lognormal clock | 236 (212-253) | 189 (163-213) |

Pyron [39] | nDNA: RAG-1 ^{5} |
44 | BEAST, Bayesian uncorrelated lognormal clock | 265 (240-290) | 208 (179-234) |

Shen et al. [50] | mtDNA and nDNA | 5 | “Multidivtime”, Bayesian autocorrelated clock | n/a | 205 (180-228) |

Vidal and Hedges [51] | nDNA: C-mos, RAG-1 | 19 | “Multidivtime”, Bayesian autocorrelated clock | < 251 | 240 (221-251) |

Wiens et al. [41] | nDNA: RAG-1 ^{6} |
261 ^{7} |
r8s, Penalized Likelihood | 227 ^{8} |
179 ±5.5 |

Annotations: ^{1} focused on lacertids, ^{2} range of four different estimates provided by varying the number of calibration points,
^{3}*Sphenodon* was not included amongst the taxa therefore the estimate better corresponds to one
for Lepidosauromorpha, ^{4} four fossil calibrations from Müller and Reisz [52], ^{5} five fossil calibrations from Hugall et al. [36], ^{6} supertree approach, ^{7} focused on taxa with a snake-like bodyform, ^{8} used as fixed calibration point. Abbreviations: *JU* Jurassic, *TR* Triassic.

Jones * et al.*

Jones * et al.* *BMC Evolutionary Biology* 2013 **13**:208 doi:10.1186/1471-2148-13-208