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. 2011 Feb;18(1):21-34.
doi: 10.1051/parasite/2011181021.

First report of Neoechinorhynchus (Acanthocephala: Neoechinorhynchidae) from marine fish of the eastern seaboard of Vietnam, with the description of six new species

O M Amin  1 , N V Ha, D N Ha
Affiliations

First report of Neoechinorhynchus (Acanthocephala: Neoechinorhynchidae) from marine fish of the eastern seaboard of Vietnam, with the description of six new species

O M Amin et al. Parasite. 2011 Feb.

Abstract
in English, French

The occurrence of acanthocephalans of the genus Neoechinorhynchus Stiles and Hassall, 1905 in Vietnamese waters is reported for the first time. Six new species are described from seven species of marine fish of the families Belonidae, Clupeidae, Megalopidae, Mugilidae, and Sciaenidae, collected in Halong Bay of the eastern seaboard of Vietnam in 2008 and 2009. These are Neoechinorhynchus (Neoechinorhynchus) plaquensis n. sp. characterized by dermal plaques covering the entire trunk; Neoechinorhynchus manubriensis n. sp. with very long anterior proboscis hooks having roots with prominent anterior manubria and very small and equal middle and posterior hooks, two pseudo-retractors in the receptacle, simple vagina, and terminal gonopore; Neoechinorhynchus pennahia n. sp. with equal anterior and middle proboscis and somewhat smaller posterior hooks, and terminal female gonopore; Neoechinorhynchus ampullata with many giant nuclei in the body wall and lemnisci and a parareceptacle structure complex which includes pumping ampullas reported for the first time; Neoechinorhynchus (Neoechinorhynchus) longinucleatus n. sp. with very long giant nuclei in the Lemnisci, anteriorly twisted vagina, and subterminal female gonopore. Neoechinorhynchus (Neoechinorhynchus) ascus n. sp. is the second species of Neoechinorhynchus found with the parareceptacle structure/ampulla complex. Neoechinorhynchus (Neoechinorhynchus) johnii Yamaguti, 1929 of Bilqees, 1972 is not N. johnii because of proboscis armature and other discrepancies with the Yamaguti material. Notes on host distribution and feeding habits are also included.

La présence d’acanthocéphales du genre Neoechinorhynchus Stiles et Hassal, 1905 est signalée pour la première fois dans les eaux vietnamiennes. Six nouvelles espèces sont décrites chez sept poissons marins récoltés dans la Baie d’Halong sur la côte orientale du Vietnam en 2008 et 2009. Il s’agit de Neoechinorhynchus (Neoechinorhynchus) plaquensis n. sp., caractérisé par des plaques dermiques couvrant la totalité du tronc ; Neoechinorhynchus manubriensis n. sp., dont les crochets de la rangée antérieure sont très longs et présentent une racine pourvue d’un manubrium antérieur proéminant tandis que les crochets de la deuxième et de la troisième rangées sont petits et de taille équivalente, deux pseudo rétracteurs dans le réceptacle, un vagin simple et un gonopore terminal ; Neoechinorhynchus pennahia n. sp., avec les crochets des deux premières rangées de taille équivalente, une troisième rangée de petites épines et un gonopore femelle terminal ; Neoechinorhynchus ampullata avec de nombreux noyaux géants dans la paroi du corps et les lemnisques et un pararéceptacle, structure complexe, comprenant des ampoules signalées pour la première fois ; Neoechinorhynchus (Neoechinorhynchus) longinucleatus n. sp., avec de très longs noyaux géants dans les lemnisques, un vagin enroulé dans sa partie antérieure et un gonopore femelle subterminal. Neoechinorhynchus (Neoechinorhynchus) ascus n. sp. est la seconde espèce trouvée, du genre Neoechinorhynchus, présentant un complexe pararéceptacle/ampoules. Neoechinorhynchus (Neoechinorhynchus) johnii Yamaguti, 1929 de Bilqees, 1972 n’est pas N. johnii en raison de l’armature du proboscis ainsi que d’autres différences avec le matériel de Yamaguti. Des indications sur le spectre d’hôtes et la localisation dans le tube digestif de l’hôte sont également signalées.

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Figures

Figs 1-7.
Figs 1-7.
Neoechinorhynchus (Neoechinorhynchus) plaquensis n. sp. 1. Holotype male. 2. Dermal plaques from the trunk of the holotype male. 3. Allotype female. 4. Egg. 5. Proboscis hooks. 6. Proboscis and receptacle of allotype female showing cell pouch (arrow) at its posterior end. 7. Female reproductive system. Measurement bars: 1, 3: 3 mm; 2: 10 μm; 4: 20 μm; 5: 50 μm; 6: 125 μm; 7: 500 μm.
Figs 8-14.
Figs 8-14.
Neoechinorhynchus manubriensis n. sp. 8. Holotype male. 9. Detail of the posterior end of the holotype male. 10. Reproductive system of allotype female in Fig. 13. 11. Proboscis and receptacle of holotype male. Note the pseudo-retractors and their posterior filaments (arrows). 12. Proboscis hooks of allotype female. 13. Allotype female. 14. Reproductive system of a juvenile female. Measurement bars: 8: 4 mm; 9: 1 mm; 10, 11: 200 μm; 12: 30 μm; 13: 2 mm; 14: 70 μm.
Figs 15-18.
Figs 15-18.
Neoechinorhynchus pennahia n. sp. 15. Holotype female. 16. Anterior end of the holotype showing the relationship between the proboscis, receptacle, and lemnisci. 17. Proboscis hooks. 18. Reproductive system of holotype indicating the reconstructed posterior tip. Measurement bars: 15: 2 mm; 16: 500 μm; 17: 55 μm; 18: 250 μm.
Figs 19-23.
Figs 19-23.
Neoechinorhynchus ampullata n. sp. 19. Holotype male. 20. Allotype female. 21. Reproductive system of allotype female. 22. Proboscis and receptacle of allotype female showing parareceptacle structures (solid arrows) and ampullas (granular arrows) of the parareceptacle complex. 23. Proboscis hooks of allotype female. Measurement bars: 19, 20: 3 mm; 21: 700 μm; 22: 250 μm; 23: 50 μm.
Figs 24-31.
Figs 24-31.
Neoechinorhynchus (Neoechinorhynchus) longnucleatus n. sp. 24. Holotype male; anterior testis often much closer to lemnisci. 25. Bursa of holotype male. 26. Allotype female. 27. Egg. 28 Anterior end of paratype male. 29. Proboscis and receptacle of the same paratype male in Fig. 28 showing the apical structure, anterior trunk collar, dermal plaques (arrow), and the two types of nuclei of the cephalic ganglion. 30. Proboscis hooks of a paratype male. 31. The reproductive system of the allotype female showing the multiple uterine bell cells and the twisted anterior part of the vagina (arrow). Measurement bars: 24: 5 mm; 25, 31: 500 μm; 26: 4 mm; 27: 30 μm; 28: 1 mm; 29: 250 μm; 30: 50 μm.
Figs 32-38.
Figs 32-38.
Neoechinorhynchus (Neoechinorhynchus) ascus n. sp. 32. Young paratype male; cement gland with 12 giant nuclei, reproductive system with only Saefftigen’s pouch well developed and mid-trunk not as wide as in mature adults. 33. Gravid paratype female. 34. Reproductive system of mature adult holotype male. Note sensory cells on bursa (arrow). 35. Proboscis hooks of a paratype male. 36. Egg. 37. The proboscis and receptacle of allotype female showing the parareceptacle structures (solid arrows) and ampullas (granular arrows) of the parareceptacle complex. 38. Reproductive system of a paratype female. Measurement bars: 32, 33: 2 mm; 34: 1 mm; 35: 75 μm; 36: 35 μm; 37: 300 μm; 38: 400 μm.
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References

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