Isolation of a new species of rotifer-attacking Olpidium

Abstract

Olpidium paradoxum sp. nov. was found to attack adult loricate rotifers and their eggs in a sample of pond water in Japan. The fungus produced zoosporangia inside the host from which exit tubes of variable length grew to the outside environment. Pyriform zoospores with a single long posterior flagellum were released from the sporangia.