Table 2 Overview of calibrated node ages resulting from two independent runs of 108 generations (for nodes with a fossil calibration), and derived node ages either resulting from independent runs that did not include a calibration for that node (for nodes with a fossil calibration), or derived from two independent runs using all calibrations (all nodes without a fossil calibration). A derived age was not possible for the node calibrated by Atlantidea rotundata because the tree topology changed when this fossil was removed
From: Fossil-calibrated molecular phylogeny of atlantid heteropods (Gastropoda, Pterotracheoidea)
Node | Calibration type | Calibration age (Ma) | Calibrated or derived age | Age of crown (95% confidence intervals, Ma) |
|---|---|---|---|---|
Earliest heteropod | Fossil: Coelodiscus minutus | 190.8–170.3 | Calibrated | 185.39 (189.76–182.86) |
Derived | 113.68 (138.62–100.83) | |||
Family Atlantidae | Fossil: Bellerophina minuta | 113–100.5 | Calibrated | 103.44 (109.19–100.59) |
Derived | 46.71 (75.23–27.10) | |||
Genus Atlanta | Fossil: Atlanta sp. | 28.1–23.03 | Calibrated | 25.46 (28.46–23.42) |
Derived | 35.88 (58.41–16.17) | |||
Clade Oxygyrus+ Protatlanta | Fossil: Atlantidea rotundata | 15.97–13.82 | Calibrated | 19.18 (24.22–15.47) |
Derived | N/A | |||
Genus Protatlanta | Fossil: Protatlanta kbiraensis | 15.97–13.82 | Calibrated | 14.50 (15.32–13.92) |
Derived | 8.08 (12.53–3.59) | |||
Genus Oxygyrus | Derived | 8.11 (13.04–3.66) | ||
Atlanta brunnea group | Derived | 10.92 (15.95–5.84) | ||
Atlanta inflata group | Derived | 15.69 (21.41–9.88) | ||
Atlanta lesueurii group | Derived | 16.48 (21.50–11.62) | ||
Atlanta peronii group | Derived | 15.32 (20.62–9.80) | ||
Atlanta gaudichaudi group | Derived | 13.35 (19.34–7.56) | ||
Atlanta inclinata group | Derived | 4.75 (9.78–1.10) | ||
Atlanta gibbosa group | Derived | 11.78 (17.64–6.31) | ||
Clade Atlanta peronii | Fossil: Atlanta peronii | 3.6–2.58 | Calibrated | 3.24 (3.98–2.72) |
Derived | 9.38 (15.27–4.03) |