Ultrastructural study of vitellogenesis and oogenesis of Crepidostomum metoecus (Digenea, Allocreadiidae), intestinal parasite of Salmo trutta (Pisces, Teleostei)Samuel Greani, Yann Quilichini and Bernard MarchandParasite, 23 (2016) 47DOI: https://doi.org/10.1051/parasite/2016057