An update on classification system of Digenea and position of Digenean families found in Vietnam under new classification system

Pham Ngoc Doanh

Abstract


The classification of the Digenea, which is a large and diverse subclass (18.000 nominal species) of class Trematoda, has long been a challenge especially because of the difficulties in finding diagnostic characters for identification keys of the higher taxa. Various attempts have been made to find useful criteria for an acceptable classification of this subclass. A famous system established by Skrjabin (1947-1978)dividing Digenea into 20 orders. Recently, one of the most important endeavours in the field of digenean taxonomy is the publication of the Keys to the Trematoda (2002-2008), introducing a simple classification of the Digenea, dividing this group into three orders, which was suggested by Gibson & Bray (1994) and Gibson (1996). Although three orders are used in this publication, the Digenea are keyed down directlyto superfamily level using features of the sexual adult. More recently, based on molecular data, Olson et al. 2003 split the subclass Digeneainto two orders: Diplostomida Olson, Cribb, Tkach, Bray &Littlewood, 2003 and the order Plagiorchiida La Rue, 1957.

The current classification of Digenea found in Vietnam is following the old classification system of Skrjabini (1947-1978). Therefore, the potision of taxon above family leveldo not fit the new system which is being widely accepted in world database of Digenea. This paper updated new classification system of Digenea and collate the position of Digenean families found in Vietnam under the new classification system.

 


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Published by Vietnam Academy of Science and Technology