Abstract
The platyhelminth class Trematoda comprises two subclasses with largely disparate species diversity, the small Aspidogastrea with c. 80 species and the speciose Digenea with c. 18,000 species, which has attracted much effort towards our understanding of evolutionary relationships among suprageneric taxa. This chapter focuses on insights into the classification of the Digenea that crystallised from our advanced understanding of both morphological and molecular data. The field of molecular systematics of the Digenea has experienced significant advances over the past 15 years. Phylogenetic analyses of sequence data predominantly from the 18S and 28S rRNA genes have incorporated a considerable diversity of taxa thus increasing the accuracy of phylogenetic inferences at higher taxonomic levels. As a result, the status of long-standing supraspecific taxa has been revised, new higher-level taxa have been defined and inferences made in association with morphological and life-cycle evidence. A substantial effort has been made towards a classification reflecting a natural system of the Digenea by considering morphological evidence in conjunction with phylogenies inferred from molecular data; this has resulted in considerable congruence. However, limited taxon sampling in the phylogeny of the Digenea still remains relevant especially in relation to some higher-level taxa, and an outline of these omissions is presented. A framework that has led to robust estimates of phylogeny is outlined and the application of advanced morphological and molecular approaches in digenean taxonomy and systematics is illustrated using the most comprehensively studied digenean superfamilies.
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The first author acknowledges partial support by the Czech Science Foundation (Grant P505/10/1562).
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Kostadinova, A., Pérez-del-Olmo, A. (2014). The Systematics of the Trematoda. In: Toledo, R., Fried, B. (eds) Digenetic Trematodes. Advances in Experimental Medicine and Biology, vol 766. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0915-5_2
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