Trematodes of the family Heterophyidae (Digenea) in Mexico: a review of species and new host and geographical records Author Scholz, T. Author Aguirre-Macedo, M. L. Author Salgado-Maldonado, G. text Journal of Natural History 2001 2001-12-31 35 12 1733 1772 http://www.tandfonline.com/doi/abs/10.1080/00222930152667087 journal article 10.1080/00222930152667087 1464-5262 5275922 Ascocotyle ( Phagicola ) macrostoma ( Robinson, 1956 ) Metacercaria Morphology . To date, no data on metacercarial morphology exist. Second intermediate host . Poecilia velifera (Poeciliidae) .