Pearlman, A. Lin, Y. As mentioned in Chapter 3, the sex of the echiuroid worm Bonellia depends on where a larva settles. Germ cells are required to maintain a stable sexual phenotype in adult zebrafish. The extent of the TSP varies a little among species,  and development within the oviducts must be taken into account in species where the embryo is at a relatively late stage of development on egg laying e.
Predetermination of sexual fate in a turtle with temperature-dependent sex determination. Developmental Dynamics. Protandrous Among species that change sex as adults, those that are first male, then female.
Non-genetic sex determination occurs when the sex of an organism can be altered during a sensitive period of development due to external factors such as temperature, humidity, or social interactions. Cocquet, J. The need for speed: neuroendocrine regulation of socially-controlled sex change.