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Paracapillaria (Paracapillaria) gastrica n. sp. (Nematoda: Capillariidae) from the marine fish Synodus variegatus Lacépède (Synodontidae, Aulopiformes) off New Caledonia

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Based on light and scanning electron microscopical studies, a new nematode parasite, Paracapillaria (Paracapillaria) gastrica n. sp. (Capillariidae), is described from the stomach of the marine fish (variegated lizardfish) Synodus variegatus (Lacépède) (Aulopiformes: Synodontidae) from off New Caledonia. This species is mainly characterised by the length of the spicule (267 µm), the proximal spicule end expanded to form a conspicuous folded, lobular rim, the presence of a well-developed caudal bursa supported by two lateral projections (rays) not adhering to the posterior border of body and by the size of eggs (54–60 × 24–27 µm) with non-protruding polar plugs. Paracapillaria gastrica n. sp. is the first known capillariid species parasitic in a host belonging to the fish order Aulopiformes and the first species of this genus reported from fishes in New Caledonian waters and the South Pacific Ocean.

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We wish to thank Eva Řehulková and Naďa Musilová who helped for the parasitological suvey of infected fish; other students and colleagues involved in the parasitological survey were listed in Justine et al. (2010, 2012b). The infected fish was identified by Barry Russel, Charles Darwin University, Australia. Thanks are also due to the Laboratory of Electron Microscopy, Institute of Parasitology, Biology Centre CAS, institution supported by the MEYS CR (LM2015062 Czech-BioImaging) for their support with obtaining scientific data presented in this paper, and to Blanka Škoríková of the same Institute for help with the illustrations.


This study was partly supported by the institutional support of the Institute of Parasitology, BC AS CR (585110/9500).

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Correspondence to František Moravec.

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Moravec, F., Justine, JL. Paracapillaria (Paracapillaria) gastrica n. sp. (Nematoda: Capillariidae) from the marine fish Synodus variegatus Lacépède (Synodontidae, Aulopiformes) off New Caledonia. Syst Parasitol 97, 157–163 (2020).

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