Light and electron microscopic studies onMyxobolus cotti El-Matbouli and Hoffmann, 1987 infecting the central nervous system of the bullhead (Cottus gobio)

Abstract

Myxobolus cotti (Myxozoa: Myxosporea) is described as found in the central nervous system of the bullhead (Cottus gobio) caught in the Alpine lake Königssee and in a brook in the Bavarian Forest, Federal Republic of Germany (El-Matbouli and Hoffmann 1987). Aggregations of spores and polysporoblastic trophozoites compressed and replaced large areas of the white and grey matter of the brain and spinal cord. These aggregations may be surrounded by a thin, connective tissue capsule; in a few cases they were associated with loose infiltrates of glial cells. Neither conspicuous tissue reactions nor inflammatory responses were evident. No other organs were seen to be infected with M. cotti. Mature spores are oval, with a tapering anterior end, and the pyriform polar capsules are nearly equal in size. Fresh spores measured 8.9-15.1 microns in length (mean, 12.4 microns) and 8-12.4 microns in width (mean, 9.6 microns); polar capsules were 4.3-9 microns long (mean, 6.4 microns) and 2-3.8 microns wide (mean, 2.9 microns). Light microscopy, the ultrastructure of pansporoblasts, sporogenesis and mature spores are described.

Light and electron microscopic studies on Myxobolus egyptica sp. nov. (Myxozoa, Myxosporea), infecting the hornlip mullet Oedalechilus labiosus from the Red Sea

“…A similar feature was encountered in this study. The glycogen accumulation noticed in the sporoplasm of the present species was similar to that reported by El-Matbouli et al (1990) and Ali et al (2007). A few rounded dark inclusions (sporoplasmosomes) were infrequently observed in the present sporoplasm similar to those reported by some authors (Canning et al 1999, Ali et al 2007).…”

“…The typical flat valve cell with its flat nucleus was observed during the present valvogenesis. In mature spores, electron dense bodies were noticed in the cytoplasm of the valvogenic cells of the present species, these bodies are thought to be precursor materials for valve wall formation (Current et al 1979, Stehr 1986, El-Matbouli et al 1990). …”

Sinuolinea tetraodoni n sp., a myxosporean. parasite of freshwater pufferfish Tetraodon palembangensis from Southeast Asia light and electron microscope observations

“…(Desser & Paterson 1978). In other myxosporeans, the Golgi apparatus seems also to be involved in the development of polar capsules (Lom 1969, Desser et al 1983, El-Matbouli et al 1990). There were no apparent effects on the tubules during the sporogonic stages of development, a finding consistent with other renal myxosporeans (Dykova & Lom 1982, Molnar & Kovacs-Gayer 1986, El-Matbouli & Hoffmann 1992.…”

Histopathological and ultrastructural studies of Myxobolus turpisrotundus from allogynogenetic gibel carp Carassius auratus gibelio in China

“…The sporoplasm of the present species was binucleated as in many species of Myxobolus (see El-Matbouli et al 1990, Ali et al 2003, Zatti et al 2015. Many spherical electron-dense bodies known as sporoplasmosomes are scattered throughout the cytoplasm.…”

“…The origin of polar capsules is the subject of long-term discussion. Several hypotheses of the origin of polar capsules including smooth endoplasmic reticulum or even Golgi apparatus (Lom 1969), an unnamed spherical body (El-Matbouli et al 1990) and rough endoplasmic reticulum (Pulsford and Matthews 1982, Abdel-Ghaffar et al 1995, Wu and Wang 2000, Ali et al 2003 have been proposed. In the present study, Golgi apparatus was not observed in any stage of sporogenesis, whereas aggregation of rough endoplasmic reticulum was observed close to the polar capsules, which might support the hypothesis about the origin of polar capsules from rough endoplasmic reticulum of polar capsules.…”