Evidence for Gondwanan vicariance in an ancient clade of gecko lizards

Abstract

Aim Geckos (Reptilia: Squamata), due to their great age and global distribution, are excellent candidates to test hypotheses of Gondwanan vicariance against post‐Gondwanan dispersal. Our aims are: to generate a phylogeny of the sphaerodactyl geckos and their closest relatives; evaluate previous phylogenetic hypotheses of the sphaerodactyl geckos with regard to the other major gecko lineages; and to use divergence date estimates to inform a biogeographical scenario regarding Gondwanan relationships and assess the roles of vicariance and dispersal in shaping the current distributions of the New World sphaerodactyl geckos and their closest Old World relatives. Location Africa, Asia, Europe, South America, Atlantic Ocean. Methods We used parsimony and partitioned Bayesian methods to analyse data from five nuclear genes to generate a phylogeny for the New World sphaerodactyl geckos and their close Old World relatives. We used dispersal–vicariance analysis to determine ancestral area relationships among clades, and divergence times were estimated from the phylogeny using nonparametric rate smoothing. Results We recovered a monophyletic group containing the New World sphaerodactyl genera, Coleodactylus, Gonatodes, Lepidoblepharis, Pseudogonatodes and Sphaerodactylus, and the Old World Gekkotan genera Aristelliger, Euleptes, Quedenfeldtia, Pristurus, Saurodactylus and Teratoscincus. The dispersal–vicariance analysis indicated that the ancestral area for this clade was North Africa and surrounding regions. The divergence between the New World spaherodactyl geckos and their closest Old World relative was estimated to have occurred c. 96 Myr bp. Main conclusions Here we provide the first molecular genetic phylogenetic hypothesis of the New World sphaerodactyl geckos and their closest Old World relatives. A combination of divergence date estimates and dispersal–vicariance analysis informed a biogeographical scenario indicating that the split between the sphaerodactyl geckos and their African relatives coincided with the Africa/South America split and the opening of the Atlantic Ocean. We resurrect the family name Sphaerodactylidae to represent the expanded sphaerodactyl clade.

Evolution of gliding in Southeast Asian geckos and other vertebrates is temporally congruent with dipterocarp forest development

“…Gecko genera with similar species richness to Lepidodactylus (e.g. Gehyra) are significantly older than Mid-Cenozoic in age, and the divergence between Gekko and Lepidodactylus has been estimated to have occurred near the K/T boundary, 65 Ma [18,19], hinting at earlier ages of origin for Luperosaurus as well. We performed phylogenetic and timing analyses on a dataset, including Asian flap-bearing geckos, as well as most other Southeast Asian and Pacific gekkonid genera, to both investigate evolutionary relationships among the arboreal Asian gecko genera and evaluate the tenability of a correlation between dipterocarp forest development and the evolution of gliding morphologies.…”

Evaluating evolutionary history in the face of high gene tree discordance in Australian Gehyra (Reptilia: Gekkonidae)

“…Therefore, the invasion of a tropically adapted, ancestral Gehyra from the Melanesian region at this time is plausible and supported by our ancestral state reconstruction analysis. In contrast with the other Australian Gekkotan lineages which have a Gondwanan origin, the divergence between Australian and Melanesian Gehyra is more recent (Gamble et al, 2008b;Oliver and Sanders, 2009) as is consequently the diversification within Australian Gehyra.…”

International Code of Area Nomenclature

“…Distribution patterns are corroborated as 'Gondwanan' if they are considered old enough (e.g. Gamble et al, 2008), and rejected as 'Gondwanan' if they are not (Barker et al, 2007).…”