Folia Parasitologica, vol. 58 (2011), issue 3

Folia Parasitologica 58[3] 169-177 (2011) | 10.14411/fp.2011.017

Henneguya cynoscioni sp. n. (Myxosporea: Bivalvulida), an agent of severe cardiac lesions in the spotted seatrout, Cynoscion nebulosus (Teleostei: Sciaenidae)

Iva Dyková1, Isaurede Buron2, William A. Roumillat3, Ivan Fiala1
1 Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic
2 Department of Biology, College of Charleston, Grice Marine Laboratory, 205 Ft. Johnson Rd., Charleston, South Carolina 29412, USA
3 Marine Resources Division, Inshore Fisheries Section, South Carolina Department of Natural Resources, 217 Ft. Johnson Rd., Charleston, South Carolina 29412, USA

A new myxosporean species, Henneguya cynoscioni sp. n., is described from the spotted seatrout, Cynoscion nebulosus (Cuvier) (Sciaenidae) as a causative agent of cardiac henneguyosis. This new myxosporean species is characterized by the morphology of spores and the sequence of SSU rDNA. Examination of 227 spotted seatrout from four South Carolina estuaries in 2008-2010 revealed a 33.5% total prevalence of H. cynoscioni. Henneguya cynoscioni produces lesions in the bulbus arteriosus, its specific site of infection. The severity of lesions and their impact on the bulbus arteriosus is proportional to the number of plasmodial stages developing in this segment of the heart, being most pronounced in host reaction directed against spores liberated from plasmodia.

Keywords: Henneguya cynoscioni, Myxosporea, pathogenicity, cardiac henneguyosis, Cynoscion nebulosus, Cardicola laruei, Atlantic Ocean

Received: June 7, 2011; Accepted: June 30, 2011; Published: September 21, 2011


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