Mitochondrial phylogenomics reveal the evolutionary, speciation and
biogeographical history of fruit flies (Diptera: Tephritidae)
Abstract
Fruit flies (Diptera: Tephritidae) possess high diversity and globally
wide distribution, including a range of important agricultural pests.
However, the origin, phylogeny and divergence history remain poorly
understood. We undertook the first comprehensive mitogenomic study
covering phylogenetic reconstruction, divergence time estimation and
historical biogeography analyses by analyzing 147 mitochondrial genomes
representing three subfamilies, seven tribes, 11 genera and 82 species.
The results recovered all the three subfamilies, seven tribes and 11
genera as monophyletic group. Within Dacini subfamily, our phylogeny
strongly supported the sister group relationship of (Zeugodacus + Dacus)
+ Bactrocera, which further supported to raise Zeugodacus as generic
level of Dacini. On the other hand, our molecular phylogenetic analyses
did not align well with the currently recognized subgeneric designations
within Ceratitis, Dacus and Zeugodacus. Some subgenera were recovered as
polyphyletic or paraphyletic, implying the incongruence between
morphological characters and mitogenomic data. Neither the taxa within
the Ceratitis FARQ complex nor those within the Bactrocera dorsalis
complex could be clearly distinguished as distinct species corresponding
to the morphospecies by mitochondrial phylogenetic tree. Divergence time
estimation and historical biogeography analyses indicated that the
earliest common ancestor of the Tephritidae, originated in the
Palearctic realm at 138.92-71.44 Ma, with the subsequent divergence into
Dacinae + Trypetinae and Tephritinae at 115.19-67.45 Ma equally in the
Palearctic realm. Dacini might have originated in Laurasia rather than
Gondwana and diverged into Bactrocera and Dacus + Zeugodacus at
48.43-28.70 Ma after India plate docked with Laurasia.