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RESEARCH ARTICLE
Contents Vol 38(4)

Phylogeny of the cestode family Escherbothriidae (Cestoda: Rhinebothriidea) reveals unexpected patterns of association with skate hosts

V. M. Bueno https://orcid.org/0000-0001-7786-5043 A * , B. Trevisan https://orcid.org/0000-0002-7872-985X B and J. N. Caira https://orcid.org/0000-0001-9597-6978 A
+ Author Affiliations
- Author Affiliations

A Department of Ecology and Evolutionary Biology, University of Connecticut, Unit 3043, 75 N. Eagleville Road, Storrs, CT 006269-3043, USA.

B Department of Zoology, Universidade de São Paulo, Rua do Matão, Travessa 14 número 101, São Paulo, SP, CEP 05508-090, Brazil.

* Correspondence to: veronica.m.bueno@uconn.edu

Handling Editor: Katrine Worsaae

Invertebrate Systematics 38, IS23056 https://doi.org/10.1071/IS23056
Submitted: 12 December 2023  Accepted: 17 February 2024  Published: 8 April 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

The rhinebothriidean tapeworm family Escherbothriidae has recently been expanded to include the genus Ivanovcestus, species of which parasitise arhynchobatid skates. Similarities in morphology and host associations between Ivanovcestus and Semiorbiseptum – a genus yet to be assigned to one of the families in the order Rhinebothriidea – led us to explore the possibility that Semiorbiseptum might also belong in the Escherbothriidae. Morphological similarities with Scalithrium ivanovae, Scalithrium kirchneri and Rhinebothrium scobinae, all of which also parasitise arhynchobatid skates, raised questions regarding the generic placements of these species. In addition, new collections from the skate Sympterygia brevicaudata revealed two new species that morphologically resemble species of Ivanovcestus. A combination of morphological and molecular data were used to assess the generic placement of the newly discovered species and refine our understanding of the membership of the family Escherbothriidae. Sequence data for the D1–D3 region of the 28S rDNA gene were generated de novo for 14 specimens of 7 rhinebothriidean species and combined with comparable published data to represent all 6 families in the Rhinebothriidea in the analysis. The phylogenetic tree resulting from maximum likelihood analysis strongly supports the inclusion of the genus Semiorbiseptum in the family Escherbothriidae. Our work also suggests that the skate-hosted species previously assigned to Scalithrium and Rhinebothrium are also members of Semiorbiseptum and that Ivanovcestus is a junior synonym of Semiorbiseptum. Six species are transferred to Semiorbiseptum, bringing the total number of species in the genus to ten. The diagnosis of Semiorbiseptum is amended to accommodate the additional species. A second species in the previously monotypic type genus of the family, Escherbothrium, is described. The diagnosis of the Escherbothriidae is amended to include the new and transferred species. This study underscores the importance of integrating morphological and molecular data in bringing resolution to cestode systematics. We believe our findings provide a robust foundation for future research into the evolutionary history and host associations of cestodes within the order Rhinebothriidea and beyond. These also highlight the importance of expanding our understanding of skate-hosted cestodes.

ZooBank: urn:lsid:zoobank.org:pub:8052AFCA-5FBD-4430-95F4-0E5E368DEA3D

Keywords: biodiversity, host relationships, molecular phylogenetics, molecular systematics, molecular taxonomy, morphology, nuclear DNA, Platyhelminthes.

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