Embryo of marine organism Bonellia develop into male if it develops in ...
Close vicinity of mature female
The marine echiuran worm Bonellia viridis is a classical example of environmental sex determination. Its planktonic larvae are sexually undifferentiated when they settle on the sea bed.
A larva that settles freely on the substratum, away from any adult, develops into a large free-living female. A larva that lands on the extended proboscis of a mature female is exposed to a masculinising chemical (bonellin) from her tissues, which drives it to develop into a tiny dwarf male that migrates into her genital pouch and lives as a parasitic sperm producer.
Hence, an embryo of Bonellia develops into a male when it grows in close vicinity of a mature female.
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