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Scanning electron microscope study of dinospores of Amyloodinium cf. ocellatum, a pathogenic dinoflagellate parasite of marine fish, and comments on its relationship to the Peridiniales
Landsberg, J.H.; Steidinger, K.A.; Blakesley, B.; Zondervan, R.L. (1994). Scanning electron microscope study of dinospores of Amyloodinium cf. ocellatum, a pathogenic dinoflagellate parasite of marine fish, and comments on its relationship to the Peridiniales. Dis. Aquat. Org. 20(1): 23-32. https://dx.doi.org/10.3354/dao020023
In: Diseases of Aquatic Organisms. Inter Research: Oldendorf/Luhe. ISSN 0177-5103; e-ISSN 1616-1580
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Analytical techniques > Microscopy > Electron microscopy
    Aquatic communities > Plankton > Phytoplankton
    Aquatic organisms > Marine organisms > Fish > Marine fish
    Interspecific relationships
    Parasites > Ectoparasites
    Pathogens
    Amphiprion clarkii (Bennett, 1830) [WoRMS]; Amyloodinium ocellatum (E.-M.Brown) E.-M.Brown & Hovasse, 1946 [WoRMS]; Peridiniales [WoRMS]; Pomacanthus imperator (Bloch, 1787) [WoRMS]; Sciaenops ocellatus (Linnaeus, 1766) [WoRMS]
    Marien/Kust
Auteurs  Top 
  • Landsberg, J.H.
  • Steidinger, K.A.
  • Blakesley, B.
  • Zondervan, R.L.
Abstract
    Trophonts of a parasitic dinoflagellate were obtained from the gills of feral and cultured red drum (Sciaenops ocellatus) and aquarium-housed sebae clownfish (Amphiprion clarkii), imperator (Pomacanthus imperator), mandarin goby (Pterosynchiropus splendidus) 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', 1a, 7 double prime , 6 to 8?c, ?s, 5''', 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 taxonomic classifications because of their plastic and unstable morphological characteristics, dinospore 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 fixation techniques used for A. cf. ocellatum revealed the presence of thin plates arranged in Kofoidian series. Such plates could be more prevalent in other dinoflagellate species than has been previously indicated, and existing taxonomic-classification schemes may need to be emended. Dinospores of other parasitic dinoflagellates should be reevaluated for the presence of similar diagnostic characteristics.
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