Comparison of the Developmental Stages of Some European Allocreadiid Trematode Species and a Clarification of Their Life-cycles Based on ITS2 and 28S Sequences

Overview

Journal Syst Parasitol

Specialty Parasitology

Date 2010 Jun 10

PMID 20532848

Citations 13

Authors

Romualda Petkeviciute

Virmantas Stunzenas

Grazina Staneviciute

Sergey G Sokolov

Affiliations

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Abstract

Genetic data were used to examine the diversity in some allocreadiid trematodes. Nuclear ribosomal DNA (ITS2 and partial sequences of 5.8S and 28S) was sampled from sexual adult and 'larval' stages. From these and previous reference datasets phylogenetic trees were constructed. The results uncovered genetically distinct lineages within Bunodera luciopercae (Müller, 1776), suggesting that the two Palaearctic subspecies, B. l. luciopercae and B. l. acerinae Roitman & Sokolov, 1999, and Nearctic B. luciopercae from Perca flavescens may represent distinct species with a restricted host-specificity. Identical rDNA was revealed for the sexual adult of B. l. acerinae and 'larval' B. luciopercae described by Wiśniewski (1958). An unexpected match between the rDNA sequences of adult B. l. luciopercae and 'larval' Allocreadium isoporum (sensu Wiśniewski, 1958) was also detected. The adult A. isoporum (Looss, 1894) differs significantly from the 'larval' A. isoporum, the level of rDNA sequence divergence between them (8.6 % for 5.8S-ITS2-28S sequences and 6.26% for 28S) being consistent with the level expected for intergeneric variation. These results revealed the possible existence of a cryptic species complex within the nominal species B. luciopercae and a clear need for reconsideration of some of the accepted, but largely untested, tenets regarding allocreadiid life-cycles.

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