University Of Tasmania

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Molecular Characterization of “Candidatus Similichlamydia latridicola” gen. nov., sp. nov. (Chlamydiales: “Candidatus Parilichlamydiaceae”), a Novel Chlamydia-Like Epitheliocystis Agent in the Striped Trumpeter, Latris lineata (Forster)

journal contribution
posted on 2023-05-17, 19:27 authored by Megan DeanMegan Dean, Polkinghome, A, Miller, TL, Barbara NowakBarbara Nowak
Histological analysis of gill samples taken from individuals of Latris lineata reared in aquaculture in Tasmania, Australia, and those sampled from the wild revealed the presence of epitheliocystis-like basophilic inclusions. Subsequent morphological, in situ hybridization, and molecular analyses were performed to confirm the presence of this disease and discovered a Chlamydialike organism associated with this condition, and the criteria set by Fredericks and Relman’s postulates were used to establish disease causation. Three distinct 16S rRNA genotypes were sequenced from 16 fish, and phylogenetic analyses of the nearly fulllength 16S rRNA sequences generated for this bacterial agent indicated that they were nearly identical novel members of the order Chlamydiales. This new taxon formed a well-supported clade with “Candidatus Parilichlamydia carangidicola” from the yellowtail kingfish (Seriola lalandi). On the basis of sequence divergence over the 16S rRNA region relative to all other members of the order Chlamydiales, a new genus and species are proposed here for the Chlamydia-like bacterium from L. lineata, i.e., “Candidatus Similichlamydia latridicola” gen. nov., sp. nov.


Publication title

Applied and Environmental Microbiology










Institute for Marine and Antarctic Studies


Amer Soc Microbiology

Place of publication

1752 N St Nw, Washington, USA, Dc, 20036-2904

Rights statement

Copyright 2013 American Society for Microbiology

Repository Status

  • Restricted

Socio-economic Objectives

Aquaculture fin fish (excl. tuna)

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