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Acta Parasitologica

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Volume 63, Issue 3


First molecular evidence of Thelohanellus wallagoi Sarkar, 1985 (Myxozoa) from economically important food fish, freshwater shark Wallago attu (Siluridae) in India

Abhishek Gupta / Anshu Chaudhary
  • Corresponding author
  • Molecular Taxonomy Laboratory, Department of Zoology, Chaudhary Charan Singh University, Meerut, (U.P.), India- 250004
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Anupma Garg
  • Molecular Taxonomy Laboratory, Department of Zoology, Chaudhary Charan Singh University, Meerut, (U.P.), India- 250004
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  • De Gruyter OnlineGoogle Scholar
/ Chandni Verma
  • Molecular Taxonomy Laboratory, Department of Zoology, Chaudhary Charan Singh University, Meerut, (U.P.), India- 250004
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  • De Gruyter OnlineGoogle Scholar
/ Hridaya S. Singh
  • Molecular Taxonomy Laboratory, Department of Zoology, Chaudhary Charan Singh University, Meerut, (U.P.), India- 250004
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/ Bindu Sharma
Published Online: 2018-07-04 | DOI: https://doi.org/10.1515/ap-2018-0075


The freshwater shark Wallago attu (Bl. and Schn.) is a frequent silurid in the River Ganga and one of the most commercially exploit fish in India. In a survey on its infection with myxosporeans, spore type belongs to Thelohanellus species was found in the gills, kidney and intestine respectively. Through morphological and molecular investigations, we identified the spore as Thelohanellus wallagoi Sarkar, 1985. They were pyriform in valvular view and slim in sutural view, and had one pyriform polar capsule with four to five turns. The spores measured 8.0 × 4.0 × 2.3 μm. T. wallagoi developed in small cysts in the gill lamellae, whereas cyst and scattered spores of T. wallagoi were also found in the kidney and intestine respectively. The 18S rDNA sequence of T. wallagoi isolates recovered from gills, kidney and intestine were found similar to each other and differed from any other Thelohanellus species available in GenBank and validated its status after 32 years of original description. Phylogenetic analysis signified that T. wallagoi was placed sister to Myxobolus species in the clade that indicated the polyphyletic nature of the genus Thelohanellus.

Keywords: Myxozoa; Thelohanellus; Wallago attu; 18S rDNA; India


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About the article

Received: 2018-01-03

Revised: 2018-04-11

Accepted: 2018-04-12

Published Online: 2018-07-04

Published in Print: 2018-09-25

Citation Information: Acta Parasitologica, Volume 63, Issue 3, Pages 647–653, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2018-0075.

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