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Evidence that host ecology drives first intermediate host use in the Didymozoidae (Trematoda: Hemiuroidea): an asexual infection in a vermetid (Gastropoda)

Published online by Cambridge University Press:  09 December 2022

C. Louvard Open the ORCID record for C. Louvard [Opens in a new window] ,
R. D. Corner ,
S. C. Cutmore  and
T. H. Cribb
C. Louvard*
Affiliation:
Marine Parasitology Laboratory, The University of Queensland, School of Biological Sciences, St Lucia, QLD 4072, Australia
R. D. Corner
Affiliation:
Marine Parasitology Laboratory, The University of Queensland, School of Biological Sciences, St Lucia, QLD 4072, Australia
S. C. Cutmore
Affiliation:
Queensland Museum, Biodiversity and Geosciences Program, South Brisbane, Queensland 4101, Australia
T. H. Cribb
Affiliation:
Marine Parasitology Laboratory, The University of Queensland, School of Biological Sciences, St Lucia, QLD 4072, Australia
*
Author for correspondence: C. Louvard, E-mail: [email protected]
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Abstract

The Didymozoidae (Trematoda: Hemiuroidea) is among the most speciose trematode families, known from a wide range of marine teleost fishes. Despite their richness, however, didymozoid life cycles are unusually poorly known; only two first intermediate hosts are known, a marine bivalve (Anadara trapezia) and a pelagic gastropod (Firoloida desmarestia). This study uses multi-locus molecular sequence data to identify a novel first intermediate host for the family, a sessile gastropod of the genus Thylacodes Guettard (Vermetidae). The didymozoid infection is not identified to species but, based on molecular phylogenetic analyses, it is close to Saccularina magnacetabula Louvard et al., 2022, which uses a bivalve as a first intermediate host. The distribution of known first intermediate hosts of didymozoids (a bivalve, a holoplanktonic gastropod and a sessile gastropod that feeds with the use of mucus nets) suggests that first intermediate host use within the Didymozoidae has been opportunistically driven by the trophic ecology of potential mollusc hosts and has involved significant host-switching events.

Keywords

DidymozoidaeHemiuroidealife cycleVermetidaephylogeny
Type
Research Paper
Information
Journal of Helminthology , Volume 96 , 2022 , e88
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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