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Fig III-2.

Year cycle of Gyrinus marinus Gyll. An outline of the course in numbers in different developmental stages during the year. The numbers of the stages on the water surface (pupae, tenerals, adult beetles) are set out upwards; those of the stages below the water surface are set out downwards

........	number of eggs
.-.-.-	number of larvae
-----	number of pupae
_ _ _	number of tenerals
——	number of adult beetles
	number of tenerals + adult beetles

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