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How do you determine the length of an annelid?

I'm currently studying a horse-leech, and would like to know if it is fully grown or not. When I read about different annelid species a maximum length is often given, so I wonder if there is some standard way of measuring these elastic animals?

For example, my leech varies from 2 to 10 cm, but often seems to prefer to stretch out to about 6 cm when not moving.

(Possibly I should modify this question to be just about leeches, but I also wonder about earthworms, and probably other soft and difficult worms as well...)

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