Classification and Phylogenetics of Myxozoa

Fiala, Ivan; Bartošová-Sojková, Pavla; Whipps, Christopher M.

doi:10.1007/978-3-319-14753-6_5

Cited by 136 publications

(93 citation statements)

References 101 publications

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“…Owing to their negative impact on fish, myxosporeans have attracted much attention (Lom and Dyková 2006, Liu et al 2010a, Fiala et al 2015, Velasco et al 2016. To date, approximately 2,300 myxosporean species have been described based on spore morphology (Fiala et al 2015). However, due to incredible species diversity and uniformity of spores, which are used for species identification, distinguishing the morphologically similar species based on spore morphology alone has resulted in misidentification of several cryptic species in the past (Lom and Dyková 2006, Liu et al 2010b, 2011, Fiala et al 2015.…”

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“…To date, approximately 2,300 myxosporean species have been described based on spore morphology (Fiala et al 2015). However, due to incredible species diversity and uniformity of spores, which are used for species identification, distinguishing the morphologically similar species based on spore morphology alone has resulted in misidentification of several cryptic species in the past (Lom and Dyková 2006, Liu et al 2010b, 2011, Fiala et al 2015. In China, several morphologically similar myxosporean species infecting different tissues and organs of different hosts were misidentified as the same species (Chen and Ma 1998).…”

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Myxobolus pseudowulii sp. n. (Myxozoa: Myxosporea), a new skin parasite of yellow catfish Tachysurus fulvidraco (Richardson) and redescription of Myxobolus voremkhai (Akhmerov, 1960)

Zhang¹,

Zhai²,

Liu³

et al. 2017

FOLIA PARASIT

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Two species of Myxobolus Bütschli, 1882 were found in yellow catfish Tachysurus fulvidraco (Richardson). A species of Myxobolus infecting the gills was morphologically identified as Myxobolus voremkhai (Akhmerov, 1960) and it was characterised here with additional morphological and molecular data. The other species of Myxobolus infecting the host's skin did not conform to any known myxosporean species. It is characterised by the presence of round, black or milky white plasmodia with black spots. Myxospores are pyriform in frontal view and lemon-shaped in lateral view, measuring 12.9-16.2 μm (14.6 ± 0.7 μm) in length, 8.1-10.8 μm (9.4 ± 0.5 μm) in width, and 6.1-8.1 μm (7.0 ± 0.4 μm) in thickness. Two ampullaceous polar capsules are slightly unequal in size, larger polar capsule 7.2-9.5 μm (7.9 ± 0.4 μm) long by 3.0-3.9 μm (3.5 ± 0.2 μm) wide, smaller capsule 6.9-8.0 μm (7.4 ± 0.3 μm) long by 2.9-3.9 μm (3.4 ± 0.2 μm) wide. Polar filaments are coiled with seven to nine turns. Histologically, the plasmodia develop in the stratum spongiosum of skin dermis, resulting in epithelial cell shedding and immunological cell infiltration. Given the morphological and molecular differences between this species and other species of Myxobolus, we proposed the name of Myxobolus pseudowulii sp. n. for this parasite from the skin of yellow catfish. Interestingly, some spores of the new species possess Henneguya-like caudal appendages. Phylogenetically, M. pseudowulii sp. n. and M. voremkhai infecting yellow catfish group together in one clade with other parasites of Siluriformes, indicating that parasites clustering according to the fish host order may be an important factor affecting the evolution of species within the Myxobolus clade.

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Myxobolus pseudowulii sp. n. (Myxozoa: Myxosporea), a new skin parasite of yellow catfish Tachysurus fulvidraco (Richardson) and redescription of Myxobolus voremkhai (Akhmerov, 1960)

Zhang¹,

Zhai²,

Liu³

et al. 2017

FOLIA PARASIT

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“…Thus it is necessary to record and report new parasites and pathological conditions when they are discovered because such information may be useful in the future as a baseline data for assessing the ecosystems health in the face of global warming [6]. Based on the morphological and metric characteristics of the spores, the number of Myxosporidia described around the world is estimated at 2200 species belonging to 64 genera and 17 families [7].…”

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Description of Myxidium tetraodoni Sp. Nov., Myxidium anisocapsularis Sp. Nov. and Myxobolus magai Sp. Nov. (Myxosporea: Bivalvulida) Infecting Some Freshwater Fishes in Cameroon (Central Africa)

Arnaud¹,

Benoit²,

Fomena³

2017

Fish Aquac J

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Examination of some Teleost fishes captured in the Maga detention lake located in the Far North Region of Cameroon, revealed the presence of three new species of Myxosporidia of the genera Myxidium Bütschli, 1882 and Myxobolus Bütschli, 1882 of which complete description is given in the present study. These species are: Myxidium tetraodoni sp. nov., parasite of the urinary bladder of Tetraodon lineatus Linnaeus, 1758 (Tetraodontidae) that form ellipsoidal spores with a turgid middle part and rounded ends. They measured 11.6 (10.5-12.5) µm long × 8.2 (7.2-9.6) µm broad; the spherical polar capsules are of equal size and measure 3.

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“…About 2300 species of Myxosporeans have been described so far [1]. It is known that the two largest genera of Myxosporeans (Myxobolus and Henneguya, including approximately 904 and 189 species respectively) are histologic [2,3].…”

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confidence: 99%

Spatial Distribution of Myxobolus Pethericii and Henneguya Pethericii on the Gills of an African Anabantid Ctenopoma Petherici from the Sange River, Cameroon

Gb¹,

Fomena²

2017

Fish Aquac J

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The spatial distribution of Myxobolus pethericii Fomena, Lekeufack folefack and Tang II, 2007 and Henneguya pethericii Fomena, Lekeufack folefack and Bouix, 2008 gills parasites of Ctenopoma petherici Gunther, 1864 was investigated. The gill apparatus of each host individual was divided into arbitrary regions and the number of cysts of each parasites species in each gill region was determined. Results were analysed at parasite species and xenocommunity levels. Site specificity was determined by application of Chi-square test to the data. At the same time, mean cyst loads were compared between different gill regions. The mean cyst load of the xenocommunity was higher on arches II and III than on arch IV. M. pethericii encysted more on outer hemibranch of arch IV. The medial segment of the gill was more colonized by M. pethericii and the combination made of M. pethericii+H. pethericii. The greater mean cyst load of M. pethericii was observed on medial segment. The specific preferences of a gill region might be affected by the interaction of factors such as the possible heterogeneity of the gill system, possible differences in the hydrostatic pressure of the branchial pump and the water current over different parts of the gill surface.

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Classification and Phylogenetics of Myxozoa

Cited by 136 publications

References 101 publications

Myxobolus pseudowulii sp. n. (Myxozoa: Myxosporea), a new skin parasite of yellow catfish Tachysurus fulvidraco (Richardson) and redescription of Myxobolus voremkhai (Akhmerov, 1960)

Myxobolus pseudowulii sp. n. (Myxozoa: Myxosporea), a new skin parasite of yellow catfish Tachysurus fulvidraco (Richardson) and redescription of Myxobolus voremkhai (Akhmerov, 1960)

Description of Myxidium tetraodoni Sp. Nov., Myxidium anisocapsularis Sp. Nov. and Myxobolus magai Sp. Nov. (Myxosporea: Bivalvulida) Infecting Some Freshwater Fishes in Cameroon (Central Africa)

Spatial Distribution of Myxobolus Pethericii and Henneguya Pethericii on the Gills of an African Anabantid Ctenopoma Petherici from the Sange River, Cameroon

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