Descriptions of two new acanthocephalans (Rhadinorhynchidae) from marine fish off the Pacific coast of Vietnam

Abstract Three species of acanthocephalans are described from fishes caught in the Pacific coast off eastern Vietnam and from amphibians in the midlands in 2016: (1) Acanthocephalus parallelcementglandatus Amin, Heckmann, Ha, 2014 (Echinorhynchidae), described from 1 male specimen is now fully described from males and females collected from 2 species of amphibians, the similar frog Hylarana attigua Inger, Orlov, Darevsky and the odorous frog Odorrana sp. Fei, Ye, Huang (Ranidae) in Huong Thuy, Hue City and Chu Yang Sin Park, central Vietnam, respectively, as well as from the needlefish Tylosurus sp. Cocco (Belonidae) in Binh Thuân in the Pacific South. The allotype female is designated. Neoechinorhynchus (N.) pennahia Amin, Ha, Ha, 2011 described from 1 female specimen is now fully described from males and females collected from the Toli shad (Chinese herring), Tenualosa toli (Valenciennes) (Clupeidae) in the Pacific north coast off Haiphong. The allotype male is designated. One specimen of Neoechinorhynchus (Neoechinorhynchus) longnucleatus Amin, Ha, Ha, 2011 is also reported from the common ponyfish, Leiognathus equulus (Forssskål) (Leiognathidae) in the Pacific south coast of Nha Trang and its ecology briefly discussed.

Download Full-text

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

Parasite ◽

10.1051/parasite/2019015 ◽

2019 ◽

Vol 26 ◽

pp. 14 ◽

Cited By ~ 11

Author(s):

Omar Mohamed Amin ◽

Richard Anderson Heckmann ◽

Sara Dallarés ◽

María Constenla ◽

Nguyen Van Ha

Keyword(s):

Host Species ◽

Pacific Coast ◽

Molecular Profile ◽

The Pacific ◽

Gulf Of Tonkin ◽

Original Record ◽

Coast Of Vietnam ◽

Halong Bay ◽

Anterior Ring ◽

Posterior Field

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 cox1 genes, groups with other Rhadinorhynchus species and further seems to confirm the paraphyly of the genus, which is discussed.

Download Full-text

A new digenean, Didymocystis margolisi n.sp. (Didymozoidae: Didymozoinae), from the skipjack tuna, Katsuwonus pelamis, of Japan

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f95-514 ◽

1995 ◽

Vol 52 (S1) ◽

pp. 95-97 ◽

Cited By ~ 2

Author(s):

Shunya Kamegai ◽

Jun Araki

Keyword(s):

New Species ◽

Marine Fish ◽

Pacific Coast ◽

Subcutaneous Tissue ◽

Skipjack Tuna ◽

Central Japan ◽

Katsuwonus Pelamis ◽

The Pacific ◽

Host Blood

Didymocystis margolisi n.sp. (Digenea: Didymozoidae: Didymozoinae) is described from a marine fish, Katsuwonus pelamis, caught off the Pacific coast of central Japan. Worms were found in pairs in a round somewhat flattened cyst in the dorsolateral subcutaneous tissue of the host. The new species is characterized by the intestine being distended with dark ingesta from the host blood, the forebody attached near to central part of hindbody, elongated testes, and a highly branched ovary. Taxonomic problems of the genus Didymocystis and its allied genera are discussed. Didymocystis komoroensis (Nikolaeva and Dubina, 1978) n.comb. (Syn. Didymocystoides komoroensis) is proposed and the genera Coeliodidymocystoides Yamaguti, 1970 and Univitellodidymocystis Yamaguti, 1970 are considered valid.

Download Full-text

Molecular Identification of Adenocephalus pacificus (Cestoda) from Three Human Cases in Lima Province, Peru

The Korean Journal of Parasitology ◽

10.3347/kjp.2020.58.4.457 ◽

2020 ◽

Vol 58 (4) ◽

pp. 457-460

Author(s):

Aarón Mondragón-Martínez ◽

Rosa Martínez-Rojas ◽

Enrique Garcia-Candela ◽

Abraham Delgado-Escalante ◽

Manuel Tantaleán-Vidaurre ◽

...

Keyword(s):

Cytochrome C ◽

South America ◽

Cytochrome C Oxidase ◽

Marine Fish ◽

Molecular Identification ◽

Causative Agent ◽

Pacific Coast ◽

The Other ◽

Partial Sequence ◽

The Pacific

The Pacific tapeworm Adenocephalus pacifcus (syn. Diphyllobothrium pacificum) is a causative agent of diphyllobothriosis occurred in Pacific coast of South America, mainly in Peru. Source of infections are traditional meal from raw or undercooked marine fish such as “cebiche”. We confirmed 3 new cases, one including scolex and the other two headless. A strobila 46 cm long without scolex was discharged from an 8-year-old boy before treatment. Specimens were confirmed morphologically by presence of tegumental protuberances on proglottids and small sized eggs. Partial sequence of cytochrome c oxidase subunit 1 gene was congruent with A. pacificus sequences.

Download Full-text