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A new gonad-infecting species of Philometra (Nematoda: Philometridae) from the red cusk-eel Genypterus chilensis (Osteichthyes: Ophidiidae) off Chile

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Abstract

A new nematode species, Philometra genypteri sp. n. (Philometridae), is described from male and female specimens found in the ovary of red cusk-eel, Genypterus chilensis (Guichenot) (Ophidiidae, Ophidiiformes), from the eastern South Pacific Ocean off the coast of northern Chile. Based on light and scanning electron microscopy examination, the new species differs from most other gonad-infecting Philometra spp. in the length of spicules (126–135 μm), a gubernaculum with dorsal lamella-like structures on its distal end, and the number and arrangement of genital papillae in the male. From a few congeneric, gonad-infecting species with unknown males, it can be distinguished by some morphological and biometrical features found in gravid female (absence of caudal projections, length of first-stage larvae or oesophagus, moderately developed anterior oesophageal inflation) and by the host type (fish family) and geographical distribution. P. genypteri is the first philometrid species reported from a fish belonging to the order Ophidiiformes and the second nominal species of Philometra recorded from marine fishes of the eastern South Pacific.

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Acknowledgements

Partial results of the grant FONDECYT (National Fund for Science and Technology, Chile) 1050528.Thanks are also due to the staff of the Laboratory of Electron Microscopy, Institute of Parasitology, BC ASCR, in České Budějovice for their technical assistance, and to Blanka Škoríková of the same Institute for the help with illustrations. This study was partly supported by the research projects of the Institute of Parasitology, ASCR (Z60220518 and LC522).

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Authors and Affiliations

  1. Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic

    František Moravec

  2. Instituto Investigaciones Oceanológicas, Facultad de Recursos del Mar, Universidad de Antofagasta, P.O. Box 170, Antofagasta, Chile

    Rosa A. Chávez & Marcelo E. Oliva

Authors
  1. František Moravec
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  2. Rosa A. Chávez
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  3. Marcelo E. Oliva
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Correspondence to František Moravec.

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Moravec, F., Chávez, R.A. & Oliva, M.E. A new gonad-infecting species of Philometra (Nematoda: Philometridae) from the red cusk-eel Genypterus chilensis (Osteichthyes: Ophidiidae) off Chile. Parasitol Res 108, 227–232 (2011). https://doi.org/10.1007/s00436-010-2054-0

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