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Trophonts of a parasitic dlnoflagellate were obtalned from the gills of feral and cultured red drum Sciaenops ocellatus and aquarium-housed sebae clownflsh Amphiprion clarku, Imperator Pomacanthus imperator, mandann goby Pterosynchiropus splend~dus and flame angelfish Centropyge loriculus. After incubation of tomonts, dinospores were studied by scanning electron microscopy. Dinospores have a plate pattern and tabulation of PO, cp, X. 4 ' , l a , 7 " , 6 to 8?c, ?S, S"', 2"", which are similar to that of the free-living Peridiniales. The parasite is tentatively identified as Amyloodinium cf. ocellatum. Most descriptions of parasitic dinoflagellates rely only on the morphology of the trophont. However, despite the fact that some past studies have questioned the validity of using dinospores in making taxonolnic classifications because of their plastic and unstable morphological characteristics, dlnospore characterization is critical Traditionally, dinospores of parasitic dinoflagellates have been described as unarmored (naked) and have been considered to have gymnodinioid, gyrodinioid or cochlodinioid forms. Ultrastructural f~xation techniques used for A. cf. ocellatum revealed the presence of thin plates arranged in Kofoldlan series. Such plates could be more prevalent in other dlnoflagellate species than has been previously ~ndicated, and existing taxonom~c-classification schemes may need to be emended. Dinospores of other parasitic dinoflagellates should be reevaluated for the presence of similar diagnostic characteristics.

diseases of aquatic organisms

Scanning electron microscope study of dinospores of Amyloodinium of. ocellatum, a pathogenic dinoflagellate parasite of marine fish, and comments on its relationship to the Peridiniales