Two new species of Myxobolus (Myxozoa:Myxosporea:Bivalvulida) from freshwater fishes of Punjab wetlands (India)

In the present study, a new species Myxobolus dermiscalis n. sp. infecting scales of Labeo rohita, an Indian major carp from Harike Wetland in Punjab, India has been described on the basis of spore morphology and amplification of a part of 18S rDNA gene. The pseudocysts of M. dermiscalis n. sp. are milky white with irregular outline, 0.5–3.6 mm in diameter embedded within the dermal scale in the form of a cavity. The spores 5.84–7.98 × 3.98–5.98 μm in size, having two equal polar capsules 3.98–5.98 × 1.85–3.85 μm in size. The most differentiating feature from closely related species, Myxobolus saugati (Kaur and Singh, 2011) is the presence of two parietal folds at the posterior – lateral margins of the shell valves. The present species is regarded as host, organ and tissue specific in nature. The partial sequence of SSU gene of M. dermiscalis n. sp. clustered with other Myxobolus species infecting cyprinids available in the GenBank. Blast search revealed 98% homogeneity with Myxobolus sp (KM401439) infecting scales of L. rohita in Myanmar (unpubl. data). The present myxobolid parasite has been recorded to cause serious, highly symptomatic disease of the scales, causing their loosening from the skin of L. rohita. It rendered the host fish unsightly giving it cloudy appearance with white patches and mucoid body surface. Scale pseudocyst Index (SPI) has been provided to record the intensity of infection.

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“…rohita ; and M . saugati ( Kaur and Singh, 2011 ) from scales and gill lamellae of Catla catla and L . rohita .…”

Section: Discussionmentioning

confidence: 99%

Molecular identification of a new myxozoan, Myxobolus dermiscalis n. sp. (Myxosporea) infecting scales of Labeo rohita Hamilton in Harike Wetland, Punjab (India)

Kaur

Attri

Joshi³

2016

International Journal for Parasitology: Parasites and Wildlife

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“…About 67 genera are affirmed in the class of Myxosporea (Lom and Dyková 2006;Fiala et al, 2015), among which Myxobolus Bütschli, 1882 is the most species-rich genus. Among Indian fish, Kalavati and Nandi (2007) reported 103, while Kaur and Singh (2011) reported 130 known Myxobolus species. Myxozoans are one of the economically important groups of microscopic metazoan parasites as they infect fish that are harvested for food .…”

Section: Introductionmentioning

confidence: 99%

Morphological, histopathological and molecular characterization of Myxobolus szekelyianus n. sp. (Cnidaria: Myxosporea: Myxobolidae) causing acute gill disease in Schizothorax esocinus (Heckel, 1838) from River Jhelum of Kashmir Himalayan region, India

et al. 2021

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During the present study, we describe a novel myxozoan that forms plasmodia in the gill filament of Schizothorax esocinus collected from River Jhelum of Kashmir Himalayan region (n = 26). Description of the new species is based on morphology of the myxospore and on partial 18S rDNA gene. The results showed that the plasmodia were large, visible with naked eye, elongate in shape, whitish in colour, 8mm in diameter, at the centre of gill filament, histozoic, single or two in number per gill, but too big in size and filled by 1,000-1,400 myxospores. The myxospores measure 13.4 (length) × 9.5µm (width), short oval in frontal view, blunt at both in anterior and posterior, but somewhat narrowing towards the posterior end. Shell valves measure 0.45µm in thickness. No parietal folds were recorded. Two polar capsules equal in size, pyriform in shape were measured 7.3 × 4.2 µm (L × W). The 18S rDNA of this species (accession number MK785257) clustered phylogenetically with other related myxozoan parasites and showed maximum homogeneity of 98.63% with M. sp. SKBU-RC1 (MK412937) and M. sp. SKBU-RC2 (MK412937) infecting gills of Labeo rohita from India followed by 92.51% with M. pronini (MH329619) infecting abdominal cavity of Carassius gibelio from China. The study of histopathological changes of the gills revealed hypertrophy, hyperplasia, uplifting of cellular elements and severe damage to gill filaments resulting in suffocation of fish. By its unique myxospore morphology and its 18S rDNA sequence, we propose naming this species as Myxobolus szekelyianus n. sp.

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“…are restricted to the Indian sub-continent. Recently, Kaur and Singh (2008, 2009, 2010a, b, 2010/2011, 2011a have contributed 15 new species to the genus Myxobolus from freshwater fishes in Wetlands of Punjab.…”

Section: Introductionmentioning

confidence: 99%

Two new species of Myxobolus (Myxozoa: Myxosporea: Bivalvulida) infecting an Indian major carp and a cat fish in wetlands of Punjab, India

Kaur

Singh

2011

J Parasit Dis

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A survey of parasites of freshwater fishes in Kanjali and Harike wetlands of Punjab (India) revealed the presence of two new myxosporean species belonging to the genus Myxobolus Bütschli (Winter (ed): Protozoa, 1882). Spores of the first species, M. saugati sp. nov. parasitizing scales of Labeo rohita (Cypriniformis: Cyprinidae) vern. rohu are characterized in having 'spores measuring 8.3 9 6.6 lm in size, oval to spherical in valvular view having rounded anterior and posterior ends; polar capsules are two, equal, measuring 4.0 9 2.4 lm, pyriform with distinct neck at the anterior end; an intercapsular process is absent'. Spores of the second species, Myxobolus szekeli sp. nov. parasitizing internal wall of stomach of Wallago attu (Cypriniformis: Siluridae) vern. mulle are '8.7 9 4.1 lm in size, elongately ovoidal in valvular view having tapering, bluntly pointed anterior end and rounded posterior end; polar capsules are two, equal, measuring 4.4 9 1.5 lm, tubular with blunt anterior and rounded posterior ends; polar capsules converge anteriorly but are placed at a distance posteriorly and occupies nearly half of the spore body cavity; an intercapsular process is absent'.

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Two new species of Myxobolus (Myxozoa:Myxosporea:Bivalvulida) from freshwater fishes of Punjab wetlands (India)

Cited by 19 publications

References 16 publications

Molecular identification of a new myxozoan, Myxobolus dermiscalis n. sp. (Myxosporea) infecting scales of Labeo rohita Hamilton in Harike Wetland, Punjab (India)

Molecular identification of a new myxozoan, Myxobolus dermiscalis n. sp. (Myxosporea) infecting scales of Labeo rohita Hamilton in Harike Wetland, Punjab (India)

Morphological, histopathological and molecular characterization of Myxobolus szekelyianus n. sp. (Cnidaria: Myxosporea: Myxobolidae) causing acute gill disease in Schizothorax esocinus (Heckel, 1838) from River Jhelum of Kashmir Himalayan region, India

Two new species of Myxobolus (Myxozoa: Myxosporea: Bivalvulida) infecting an Indian major carp and a cat fish in wetlands of Punjab, India

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