Ultrastructure and development of Nosema podocotyloidis n. sp. (Microsporidia), a hyperparasite of Podocotyloides magnatestis (Trematoda), a parasite of Parapristipoma octolineatum (Teleostei).
Bottom Line: The polaroplast is divided into two regions: an outer electron-dense cup with granular content and lacking lamellae and an internal region, less electron-dense, composed of irregularly arranged sacs.The posterior vacuole, with an amorphous electron-dense content, is present.The new species is compared with other species of Nosema from trematodes.
Affiliation: Université Cheikh Anta Diop de Dakar, Laboratoire de Parasitologie, Faculté des Sciences et Techniques, BP 5055, Dakar, République du Sénégal.Show MeSH
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Mentions: At the beginning of the sporogony, the meronts of the last generation transformed with the secretion of a coat of amorphous electron-dense material on the plasmic membrane (Fig. 2A). The coat is deposited at first in irregular clumps which cover the plasmic membrane. The sporonts thus formed were bounded by a thick electron-dense wall (the thickness attained was about 20 nm), were oval (Fig. 2B) or elongate (Fig. 2C) and had one or two diplokarya. The cytoplasm of early sporonts contained numerous dispersed ribosomes, a small number of electron-lucent vesicles and a few parallel arrays of rough endoplasmic reticulum (Fig. 2B). The diplokaryon was slightly less electron-dense than the cytoplasm. It sometimes occupied more than half the cytoplasm. Nucleolus-like formations were occasionally seen (Fig. 2B).Figure 2.
Affiliation: Université Cheikh Anta Diop de Dakar, Laboratoire de Parasitologie, Faculté des Sciences et Techniques, BP 5055, Dakar, République du Sénégal.