Fig. 11-39. Amoebidium parasiticum. A. Antennae and anterior carapace of a cladoceran bearing many attached spores and thalli of the ectocommensal; the clusters of cells are sporangia (thalli) whose spores have burst through the sporangial wall to enable them to attach to another arthropod upon contact. B. Posterior end of a bloodworm (Chironomus sp.) whose anal gills are covered with the ectocommensal (arrow). C. Sporangiospores released from mature thalli that were mounted in water on a slide. Figs. 11.39A and 11.39C from Lichtwardt, 1976, by permission of Granada Publishing Ltd.