Ichthyophonus irregularis sp. nov. from the yellowtail flounder Limanda ferruginea fromthe Nova Scotia shelf

Diseases of Aquatic Organisms

Mark A. Ragan¹  Thomas G. Rand¹  Colleen A. Murphy¹  Jamie J. Cannone¹  Kelly White¹  Robin R. Gutell¹ 

关键词: Ichthyophonus hoferi;    Ichthyophonales;    Ichthyophoniasis;    Limanda ferruginea;    Ssu-rDNA;    Phylogeny;   

DOI  :  10.3354/dao041031

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: A previously described unusual form of the protistan parasite Ichthyophonus, differing in morphological and developmental features from I. hoferi sensu Plehn & Mulsow, was recovered from yellowtail flounder Limandaferruginea Storer from the Brown¹s Bank area of the Nova Scotia shelf. The nuclear gene encoding the rRNA of the small ribosomal subunit was amplified from this unusual form of Ichthyophonus using the polymerase chain reaction, sequenced andaligned with other eukaryote small subunit (ssu)-rDNAs. Inferred phylogenetic trees clearly show that its ssu-rDNA is distinct from those of 2 isolates of I. hoferi sensu Plehn & Mulsow from different hosts and geographical locations(herring in the North Sea, and yellowtail flounder from the Nova Scotia shelf). We consider the unusual form to be a separate species, I. irregularis. The occurrence of a second, distinct type of Ichthyophonus within a single host speciesraises the possibility that ichthyophoniasis could be produced by different (although related) pathogens, and in some cases, by concurrent infections of the two.

【 授权许可】

Unknown