Phylogeny and ultrastructure of Myxobolus rangeli n. sp. (Myxozoa, Bivalvulida), a histozoic parasite in Siluriformes fish from the Amazon region

亚马逊地区鲶形目鱼类组织寄生虫 Myxobolus rangeli n. sp.（粘液虫，双壳纲）的系统发生和超微结构