Remember the 2003 Disney movie, “Finding Nemo”? Fun movie; rotten biological accuracy.
Gender in real life clownfish is fluid. A real Nemo hatches into a small social group occupying one or a few sea anemones. The largest fish in the group, the only female, dominates. The next largest, the reproductive male, dominates the rest of the fish who are subordinate, non-reproductive, males.
Asking ‘when does rotiferhood begin?’ in this system is meaningless. It never ended. The unfertilized eggs were always living rotifers, just tiny. Reproductive “queens” mate with males. Those newly mated queens leave their home nests and start a new one, sometimes with workers, as in honeybee swarms. Male development is weirder. Reproductive queens lay unfertilized eggs that develop into adult males, ‘drones.’ No developmental step, like fertilization, provides a convenient, definable step to declare arbitrarily the start of drone life. Male ants have no fathers. They are just grown-up eggs.
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