22 Coryphella gracilis

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22 Coryphella gracilis

American specimen with white ovotestes. As in Europe, reddish cerata predominate, but a significant minority have green cerata. As different colour forms are found feeding together on the same hydroid, it would seem that the colour is not determined by diet.
Maine, USA. June 2021. © A. Newfield.

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Photographic guide to the identification and biology of European marine invertebrates

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