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Males of  Cathayacanthus spinitruncatus  Amin, Heckmann &amp; Ha, 2014 (Rhadinorhynchinae Lühe, 1912) are described for the first time from  Leiognathus equulus  in Hai Phong and Nha Trang and from pony fish  Nuchequula flavaxilla  in Quang Ninh in the Pacific waters of Vietnam. The male allotype status is designated. Males of  C. spinitruncatus  are smaller and have fewer and smaller proboscis hooks and trunk spines than females. The male reproductive structures are in the posterior fifth of the trunk and with 6 club-shaped cement glands gradually merging into 6 independent cement gland ducts. The proboscis receptacle is more than half as long as the trunk and with a cephalic ganglion at its anterior end. In females, the receptacle is only about one fifth the length of the trunk. Specimens described as  Cathayacanthus bagarii  Moravec &amp; Sey, 1989 were shown to have been wrongly assigned to  Cathayacanthus .  Pararhadinorhynchus magnus  n. sp. (Diplosentidae) is described from  Scatophagus argus  off Hai Phong in the Gulf of Tonkin. It is the third species of the genus and is readily distinguished from the Australian species by having a considerably larger trunk and male reproductive structures, and more proboscis hooks. X-ray microanalysis (EDAX) of intact and gallium-cut hooks of  P .  magnus  showed high calcium and phosphate mainly in the central core. Specimens of  Heterosentis holospinus  Amin, Heckmann &amp; Ha, 2011 (Arhythmacanthidae) are also reported from  L. equulus  off Quang Binh, new host and locality records.

parasite

Descriptions of acanthocephalans, Cathayacanthus spinitruncatus (Rhadinorhynchidae) male and Pararhadinorhynchus magnus n. sp. (Diplosentidae), from marine fish of Vietnam, with notes on Heterosentis holospinus (Arhythmacanthidae)