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Fig. 1 Fig. 1. The life cycle of Diplostomum spp (“eye flukes”). A. Sexual reproduction of adult parasites within the intestine of an avian definitive host. B. Fertilized egg. C. Miracidium, seeking the first intermediate host, where it will give rise to sporocysts. D. Asexual reproduction of sporocysts in a lymnaeid snail. E. Cercaria, released from snail, seeking the second intermediate host, where it will shed its tail and develop as the second larval stage. F. Metacercaria residing within the fish eye. G. The life cycle is completed when an avian definitive host eats an infected fish.
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Reprinted from Experimental Eye Research, 225, Frey, R.A., Barrett, L.M., Parkin, L., Blakeley, B., Ålund, M., Byford, G., Euhus, A., Tsarnas, C., Boughman, J.W., Stenkamp, D.L., Eye flukes (Diplostomum spp.) damage retinal tissue and may cause a regenerative response in wild threespine stickleback fish, 109298, Copyright (2022) with permission from Elsevier. Full text @ Exp. Eye. Res.