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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 .

acta parasitologica

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