Although no paper on the topic came out in the proceedings, the decision to single out Timor and Wallace's line as a problem of 'Portuguese colonial anthropology' clearly indicated its central significance in Correia's research programme.
His early racial synthesis of Oecussi and Ambeno, then, became a generative and critical piece in shifting Wallace's line. Surprisingly, though, in his 1940s speculations, Correia elaborated an ambivalent, even contradictory, reversal of his original argument.
Turning away from Wallace's Line, I see another dividing line.
Marine ecologists, who study the interrelationships among living things in the sea, have recently proposed the existence of an underwater Wallace's Line, oddly enough, perpendicular to the original north-south line.
Spreading east from Wallace's Line, Wallacea is a sort of no-man's land between Asian and Australian realms, the exclusive home of many strange creatures like the dragons of Komodo, the dwarf buffalos of Sulawesi, and the megapode birds of the Moluccas.
Wallace's Line is one of the biggest biogeographic barriers that is formed by a powerful marine current along the east coast of Borneo.
How the Denisovans got to Australia has remained a mystery and scientists now believe they must have somehow managed to get across Wallace's Line and then interbred with modern humans.
Alan Cooper of the University of Adelaide in Australia and Chris Stringer of the Natural History Museum in the UK have suggested the Denisovans crossed Wallace's Line in an opinion article published in Science.