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Started dissecting old egg cases to release juvenile worms and transfer them to clean dishes. The ratio of embryos reaching the juvenile stage in a egg mass seems to be quite variable. Some had a high rate of juveniles and others most of the embryo did not develop.

It is also clear that in a egg mass where all the embryos have the same age you can find juveniles in different sizes. Really long ones full of yolk, medium sized ones, and tiny ones with little yolk. This is presumably accounted by the fusion of the eggs/embryos during early development.

I took some pictures comparing the sizes of the juveniles in the stereoscope. Would be interesting to know if the structures they develop look the same.