Myxosporea (Protozoa: Myxozoa) of freshwater fishes in Africa: keys to genera and species

Fomena, Abraham; Bouix, G.

doi:10.1023/a:1005839220014

Cited by 45 publications

(35 citation statements)

References 8 publications

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“…The only similarity was the site of infection. As reported by Fomena & Bouix (1997), Obiekezie & Okaeme (1990) It was possible to compare the present parasite with some previously described Myxobolus heterosporus (syn. Myxosoma heterospora) from the eyes of some tilapias.…”

supporting

confidence: 74%

“…This was followed by a number of studies, such as those of Paperna (1968), Abolarin (1974), Obiekezie & Okaeme (1990) and Fomena & Bouix (1994), Kostoingue & Toguebaye (1994), Fomena & Bouix (1997). Studies in Egypt include Fahmy et al (1971), Imam et al (1987), Ashmawy et al (1989), Abdel-Ghaffar et al (1995), Koura (2000), Ali et al (2002) and El-Mansy (2002).…”

Section: Introductionmentioning

confidence: 99%

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Revision of Myxobolus heterosporus Baker, 1963 (syn. Myxosoma heterospora) (Myxozoa: Myxosporea) in African records

El-Mansy¹

2005

Dis. Aquat. Org.

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There is uncertainty regarding the validity of Myxobolus heterosporus Baker, 1963. The present study revises the taxonomy, using specimens isolated from plasmodia situated in the infected cornea of Oreochromis aureus, O. niloticus or Tilapia zillii inhabiting the River Nile, Egypt. In addition, histological effects of the parasite on the infected tissue were examined. The spores of M. heterosporus had a variety of shapes expressing remarkable heteromorphism. Five main Myxobolus-like spore types and tailed-spores were found. All forms were photographed, measured, sketched and described. Light and electron microscopy supported that spores of a Myxobolus-like morphology co-existed with so-called tailed-spores in one plasmodium. Some transitional stages from Myxobolus-like spore types to tailed-spores were observed. Therefore, some tailed-spores may be simply heteromorphs of Myxobolus. KEY WORDS: Myxosporea · Revision · Myxobolus heterosporus · Heteromorphism · Plasmodium · Cornea · Oreochromis aureus · O. niloticus · Tilapia zillii · River NileResale or republication not permitted without written consent of the publisher Dis Aquat Org 63: 205-214, 2005 (2) Baker described Myxobolus heterosporus from what he called trophozoites and spores adjacent to blood capillaries and sinusoids of liver, spleen and from the kidney. In addition, Baker (1963) and Landsberg (1985) reported an absence of cysts in spleen and kidney where melano-macrophage centers were accumulation sites for spores. The variation between the 3 spore types of M. heterosporus and the inadequate description of the trophozoites led Landsberg (1985) to assume that Baker probably confused melano-macrophage centers and trophozoites. In addition, Landsberg (1985) reported that the spore formation occurs elsewhere and that spleen and kidney might act as concentrating areas for scattered spores, thus possibly providing useful knowledge of myxosporean infections. Dyková (1982) suggested that melano-macrophages are able to transport mature spores to the melano-macrophage centers where they are destroyed. Therefore, the myxosporean parasite should be described from its original plasmodium (Lom & Arthur 1989, Molnár 1994. This was discussed by Landsberg (1985), Hegazy (1999) and El-Mansy & Abdel-Ghaffar (2003), who reported that various spores may come from their original plasmodia to the kidney via blood. In this case, the kidney infection may be used as diagnostic evidence for the presence of myxosporeans but could not be used as taxonomic evidence, and further studies to detect their exact original sites is necessary.(3) Unclear drawings and the lack of some important characters such as the number of polar filament coils led to an incomplete description. Therefore, the species described by Baker should be considered as of uncertain taxonomic status. Lom (1969) considered the number of polar filament coils an important taxonomic character.(4) In addition, all descriptions and dimensions of spores were based on fixed material which led to atypical for...

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supporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Revision of Myxobolus heterosporus Baker, 1963 (syn. Myxosoma heterospora) (Myxozoa: Myxosporea) in African records

El-Mansy¹

2005

Dis. Aquat. Org.

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“…There are several compilations of species of Myxobolus (see Hoffman et al, 1965;Grinham & Cone, 1990;Cone & Raesly, 1995;Gioia & Cordeiro, 1996;Fomena & Bouix, 1997;Chen & Ma, 1998). However, these compilations include only the parasites of certain groups of fish, or parasites infecting fish from a particular geographical area.…”

Section: Introductionmentioning

confidence: 99%

Synopsis of the species of Myxobolus Bütschli, 1882 (Myxozoa: Myxosporea: Myxobolidae)

2005

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“…Efforts in Cameroon, Nlgeria, Benin and Egypt have resulted in the description of approximately 100 myxosporean species (Fomena & Bouix 1997). However, g~v e n the very large d~versity of fish fauna in Africa (several thousand species) one would expect that a great man.y myxosporeans remain to be discovered.…”

Section: Introductionmentioning

confidence: 99%

Henneguya ghaffari sp. n. (Myxozoa:Myxosporea), infecting the Nile perch Lates niloticus (Teleostei:Centropomidae)

Ali¹

1999

Dis. Aquat. Org.

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Light microscopical description is presented for a new myxozoan species, Henneguya ghaffari, which infects the Nile perch Lates niloticus (Linnaeus, 1758) in Lake Wadi El-Raiyan in Egypt. The spore is characterized by a triangular thickening at the base of the caudal processes. The relatively long caudal processes run adherent to each other for two-thirds of their length, then bifurcate to very fine processes. Prevalence of infection was 34.6'% and peaked during winter and early spring. The infection was concentrated along the intestinal tract, and in severe cases gills and gill rakers were also infected. Histology revealed that, in contrast to findings of previously published works on related species, intralamellar plasmodia did not develop inside the blood capillaries of the gills. Intestinal plasmodia were very pathogenic due to their large number and size. These plasmodia caused atrophy of the muscularis Idyclr, and replaced and distended the submucosal and mucosal layers. The validity of some Henneguya specles in Afr~ca is discussed.

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Myxosporea (Protozoa: Myxozoa) of freshwater fishes in Africa: keys to genera and species

Cited by 45 publications

References 8 publications

Revision of Myxobolus heterosporus Baker, 1963 (syn. Myxosoma heterospora) (Myxozoa: Myxosporea) in African records

Revision of Myxobolus heterosporus Baker, 1963 (syn. Myxosoma heterospora) (Myxozoa: Myxosporea) in African records

Synopsis of the species of Myxobolus Bütschli, 1882 (Myxozoa: Myxosporea: Myxobolidae)

Henneguya ghaffari sp. n. (Myxozoa:Myxosporea), infecting the Nile perch Lates niloticus (Teleostei:Centropomidae)

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