sentences:  Most species are endemic small areas, many of which are small islands that emerged from the ocean floor in recent geological times with no connection to the mainland.These were likely inhabited by pregnant females surviving in floating logs, while most of the other speciation is believed to have occurred due to fragmentation of the former supercontinent Gondwana.The genus was erected by Octavius Pickard-Cambridge in 1883 for the type species "Sarpedon robustum", but this name was already in use for a genus of false click beetles.