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1. A new look at the life-cycle of Hoferellus carassii in the goldfish (Carassius auratus auratus) and its relation to “kidney enlargement disease” (KED)

Creator:
Trouillier, Alexander, El-Matbouli, Mansour, and Hoffmann, Rudolf W.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Myxosporea, Hoferellus carassii, Actinosporea, Aurantiactinomyxon, and Nais sp.
Language:
English
Description:
The unknown oligochaete host in the life-cycle of Hoferellus carassii Achmerov, 1960 was identified as a member of the family Naididae, the genus Nais (most probably Nais elinguis). The aurantiactinomyxon spore found by El-Matbouli et al. ( 1992a) is demonstrated to be the actinosporean stage of Hoferellus carassii. The development of this spore within the naidid host is described by electron microscopy, and the results compared with those of Janiszewska (1955, 1957) and Marqués (1984. 1986) for Actinosporea originally described as a separate group of parasites. Additionally the plasmodial development of H. carassii within the urinary bladder of the goldfish (Carassius auratus auratus Linnaeus, 1758) is described.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Electron microscopic study of a new microsporean Microsporidium epithelialis sp. n. infecting Tubifex sp. (Oligochaeta)

Creator:
Oumouna, Mustapha, El-Matbouli, Mansour, Rudolf W., and Bouix, Georges
Format:
print
Type:
model:internalpart and TEXT
Subject:
Microsporea, Actinosporea, ultrastructure, Oligochaeta, and Tubificidae
Language:
English
Description:
The cytology of a new microsporean parasite Microsporidium epithelialis sp. n. from the intestinal epithelial cells of the freshwater oligochaete Tubifex sp. (Tubificidae) is described. The microsporean occurred together with an actinosporean of the genus Triactinomyxon, which was found between the epithelial cells. The merogonic and sporogonie stages (mature spores included) of the microsporean parasite are monokaryotic. An individual sporophorous vesicle surrounds each spore. The fixed and stained spore has an average dimension of 1.9-2.5 x 0.9-1.2 pm. The spores are oval with a characteristic surface layer, showing ornamentation-like projections, which are in close contact to the exosporc. A short polar filament forming three to four coils traverses the polaroplast with two lamellar layers. The ultrastructure and other characteristic features of this microsporean parasite are distinct from those of the microsporean species described so far from oligochaetes.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public