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Acta Parasitologica

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Volume 63, Issue 3


Morphological and molecular study of Neorhadinorhynchus nudus (Harada, 1938) (Acanthocephala: Cavisomidae) from Auxis thazard Lacepede (Perciformes: Scombridae) in the South China Sea

Liang Li
  • Corresponding author
  • Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, 050024 Shijiazhuang, Hebei Province, People’s Republic of China
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Hui-Xia Chen
  • Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, 050024 Shijiazhuang, Hebei Province, People’s Republic of China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Yue Yang
  • Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, 050024 Shijiazhuang, Hebei Province, People’s Republic of China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2018-07-04 | DOI: https://doi.org/10.1515/ap-2018-0057


In the present study, Neorhadinorhynchus nudus (Harada, 1938) is reported from the frigate tuna Auxis thazard (Lacepéde) (Perciformes: Scombridae), in the South China Sea for the first time. The detailed morphology of N. nudus was studied using light and scanning electron microscopy based on the newly collected material. The results showed some morphometric variability between our specimens and previous studies, including the number of hooks per longitudinal row and the size of copulatory bursa and eggs. Our SEM observations also revealed all proboscis hooks emerged from elevated round rims on proboscis surface. In addition, N. nudus was firstly characterised using molecular methods by sequencing and analysing the ribosomal ITS and mitochondrial cox1 regions. There is no nucleotide divergence found in the ITS sequences, but a low level of nucleotide variability detected in the cox1 regions (the level of intraspecific nucleotide variability being 0.75% to 2.54%). The DNA sequence data obtained herein will indeed be a useful reference for rapid and accurate species identification of Neorhadinorhynchus.

Keywords: Palaeacanthocephala; Echinorhynchida; taxonomy; Auxis thazard; internal transcribed spacer (ITS); cytochrome c oxidase subunit 1 (cox1)


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About the article

Received: 2017-12-17

Revised: 2018-03-01

Accepted: 2018-04-04

Published Online: 2018-07-04

Published in Print: 2018-09-25

Citation Information: Acta Parasitologica, Volume 63, Issue 3, Pages 479–485, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2018-0057.

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