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Rhadinorhynchus laterospinosus  Amin, Heckmann & Ha, 2011 (Rhadinorhynchidae) was described from a single female collected from a trigger fish,  Balistes  sp. (Balistidae) from the northern Pacific coast of Vietnam in Halong Bay, Gulf of Tonkin. More recent collections of fishes in 2016 and 2017 revealed wider host and geographical distributions. We report this Acanthocephala from nine species of fish representing six families (including the original record from  Balistes  sp.) along the whole Pacific coast of Vietnam. The fish species are  Alectis ciliaris  (Carangidae),  Auxis rochei  (Scombridae),  Auxis thazard  (Scombridae),  Leiognathus equulus  (Leiognathidae),  Lutjanus bitaeniatus  (Lutjanidae),  Megalaspis cordyla  (Carangidae),  Nuchequula flavaxilla  (Leiognathidae), and  Tylosurus  sp. (Belonidae). We provide a complete description of males and females of  R. laterospinosus , discuss its hook metal microanalysis using EDAX, and its micropores. Specimens of this species characteristically have lateral trunk spines bridging the anterior ring of spines with posterior field of ventral spines and a proboscis with 15–19 longitudinal alternating rows of 21–26 hooks each varying with host species. We demonstrate the effect of host species on the distribution and size of the trunk, proboscis, proboscis hooks, trunk spines, and reproductive structures. The molecular profile of this acanthocephalan, based on 18S rDNA and  cox 1 genes, groups with other  Rhadinorhynchus  species and further seems to confirm the paraphyly of the genus, which is discussed.

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Morphological and molecular description of <i>Rhadinorhynchus laterospinosus</i> Amin, Heckmann &amp; Ha, 2011 (Acanthocephala, Rhadinorhynchidae) from marine fish off the Pacific coast of Vietnam

Morphological and molecular description of Rhadinorhynchus laterospinosus Amin, Heckmann & Ha, 2011 (Acanthocephala, Rhadinorhynchidae) from marine fish off the Pacific coast of Vietnam