ABSTRACT. Kudoa thyrsites (Myxozoa: Multivalvulida) is a cosmopolitan marine parasite of fishes associated with post‐mortem tissue degradation. Financial losses incurred as a result of these infections are of concern to commercial fisheries. There is conflicting evidence whether K. thyrsites represents a cryptic species complex. Myxospore morphology is very similar for K. thyrsites across its range, but preliminary genetic analyses show some differences. Kudoa thyrsites and the morphologically similar Kudoa histolytica were examined from hosts in British Columbia, Canada, Oregon, USA, Chile, England, South Africa, Australia, and Japan. We compared myxospore morphology and DNA sequences of heat shock protein 70 and the small subunit, large subunit, and internal transcribed spacer 1 of the ribosomal DNA. There was some morphological variation between regional representatives, inconsistent with genetic analyses. Phylogenetically, major separations correlated to four broad geographic regions: Japan, Australia, eastern Pacific, and eastern Atlantic. Within these regions there was little additional genetic structure. These data are evidence for regional subdivision of K. thyrsites suggesting global transplantation of fishes has yet to homogenize these distinctions. Within regions, parasite gene flow appears to be high between host species, suggesting little host specificity and minimal cryptic speciation. Our data also indicate that K. histolytica is not a valid species, as it was morphologically and genetically indistinguishable from K. thyrsites.

CHRISTOPHER M. WHIPPS

MICHAEL L. KENT

The Journal of Eukaryotic Microbiology

《真核微生物学杂志》发表了关于原生生物的原始研究，包括低等藻类和真菌。发表的文章涵盖了这些生物的所有方面，包括它们的行为、生物化学、细胞生物学、化学疗法、发育、生态学、进化、遗传学、分子生物学、形态遗传学、寄生虫学、系统学和超微结构。

The Journal of Eukaryotic Microbiology publishes original research on protists, including lower algae and fungi. The articles cover all aspects of these organisms, including their behavior, biochemistry, cell biology, chemotherapy, development, ecology, evolution, genetics, molecular biology, morphological genetics, parasitology, systematics, and ultrastructure.

《Journal of Eukaryotic Microbiology》发表关于原生生物的原创研究，涵盖低等藻类和真菌等生物的各个方面。这些研究包括它们的行为、生物化学、细胞生物学、化学疗法、发育、生态学、进化、遗传学、分子生物学、形态遗传学、寄生虫学、系统学和超微结构等领域。

Category	Quartile
生物学	4
生物学, 微生物学	4

Phylogeography of the Cosmopolitan Marine Parasite Kudoa thyrsites (Myxozoa: Myxosporea)

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