Aspidogaster:
 Metazoa Platyhelminthes Trematoda Aspidogastrea

These primitive parasites are not specialized in any way and do not need a vertebrate host to complete their life cycles. The representative species of this genus is Aspidogaster Conchicola which infects fresh-water mussels, snails, clams, fish, and turtles. These parasites are capable of reaching sexual maturity and completing their entire life cycle within a single host, but the specific details of this life cycle are murky and not well understood.