Phylogenetics: Which was first, TSD or GSD?

By F. Janzen, James G. Krenz. 2004

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Steps in the evolution of heteromorphic sex chromosomes (2005, background): “Animal genetic sexdetermining systems may, however, often have evolved from environmental sex determination, again with established male and female organs and physiology (Janzen and Krenz, 2004).”
Phylogeny of sex-determining mechanisms in squamate reptiles: are sex chromosomes an evolutionary trap? (2009, methodology): “Janzen & Krenz (2004) found six transitions from TSD to GSD and not even a single transition in the opposite direction in turtles, in which TSD is the ancestral state as well.”