New species of Asymphylodorinae Szidat, 1943 (Digenea: Lissorchiidae), fish parasites from the East Asian Region: morphological and molecular data

Abstract

We generated new morphological and molecular data on some trematodes of the family Lissorchiidae from fish from the south of the Russian Far East. Four new species, including two species previously considered Parasymphylodora japonica and P. markewitschi in the Far East, were established on the basis of molecular data and morphological characteristics of adult worms and metacercariae. Molecular phylogenetic analysis based on partial 28S rDNA sequences showed that the subfamily Asymphylodorinae was monophyletic, while the subfamily Lissorchiinae was polyphyletic within the Lissorchiidae, confirming the results of previous studies on this family. All asymphylodorine trematodes from our phylogenetic analysis were sorted into several groups, which differ from each other at the intergeneric level by molecular data but could not be confidently delimited based on morphological characteristics. For this reason, we consider all trematodes from Asymphylodorinae within two existing genera, Parasymphylodora and Asymphylodora, both sensu lato. The first molecular data were generated for Asymphylotrema macrocetabulum, the type species of the genus.

http://zoobank.org/urn:lsid:zoobank.org:E2800CDB-D2EF-4DA3-8912-07BFBE47E1E0

Key words:

• Asymphylodora
• Asymphylodorinae
• Asymphylotrema
• East Asian Region
• fish parasites
• Lissorchiidae
• Parasymphylodora
• 28S

Acknowledgements

Authors are deeply grateful to PhD Sergey G. Sokolov for useful comments for the article.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Associate Editor: Jesus Hernández-Orts

Additional information

Funding

This study was supported by Russian Scientific Foundation, project no. 22-24-00896.