Systematic Parasitology

, Volume 95, Issue 5, pp 403–414 | Cite as

Pseudodelphis eleginopsis n. sp. (Nematoda: Guyanemidae), a new tissue-dwelling parasite of the Patagonian blennie Eleginops maclovinus (Cuvier) (Perciformes: Eleginopsidae) in Argentina, with notes on related forms

  • František MoravecEmail author
  • Gabriela N. Novacovsky
  • Jesús S. Hernández-Orts
Part of the following topical collections:
  1. Nematoda


Based on light and scanning electron microscopical studies, a new nematode parasite, Pseudodelphis eleginopsis n. sp. (Dracunculoidea: Guyanemidae), is described from tissues behind the gills of the Patagonian blennie Eleginops maclovinus (Cuvier) (Perciformes: Eleginopsidae) off the Atlantic coast (San Matías and San José Gulfs) of Patagonia, Argentina. The new species is mainly characterised by the length of the body (males 10–13 mm, larvigerous females 31–59 mm), the number (14) and arrangement of cephalic papillae, the absence of a buccal capsule, the muscular to glandular oesophagus length ratio (1:3–4) of larvigerous females, the length of the spicules (48–63 µm) and the number (7 pairs) and arrangement of the caudal papillae in the male. Pseudodelphis eleginopsis n. sp. is the first species of this genus described from a marine fish in the Atlantic Ocean and the first known dracunculoid parasitising the fish host belonging to the family Eleginopsidae. As revealed by the examination of very young females of the new species, the female genital tract of Pseudodelphis spp. is monodelphic. The genus Syngnathinema Moravec, Spangenberg & Frasca, 2001 is considered a junior synonym of Pseudodelphis Adamson & Roth, 1990 and, consequently, S. californiense and S. chitwoodi are transferred to Pseudodelphis as P. californiensis (Moravec, Spangenberg & Frasca, 2001) n. comb. and P. chitwoodi (Moravec & Kuchta, 2013) n. comb., respectively. Two dracunculoid species, Pseudodelphis limnicola Brugni & Viozzi, 2006 and the previously established Philonema percichthydis Moravec, Urawa & Coria, 1997, both described from the same freshwater host species, Percichthys trucha (Valenciennes), in the same region (Patagonia), are considered to be identical; therefore, the valid name of this species is Pseudodelphis percichthydis n. comb. and P. limnicola becomes its junior synonym. A key to the species of Pseudodelphis is provided.



Special thanks are due to Enrique A. Crespo and Francisco J. Aznar for their assistance during this research. We are indebted to Raúl A. González, Maite A. Narvarte, Dennis N. Landete, M. González, Ana Cinti, Lucas Del Río, Pablo España, Federico Dal Zio and Felipe Carou for their assistance in the collection of Patagonian blennies. 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 supported by the following projects: Agencia Nacional de Promoción Científica y Tecnológica (MINCYT, Argentina) no. PICT-2015-2063 and the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) no. PIP 1122015-0100085CO from Argentina. The study was also partly supported by the Fondo Solidario Comunes del Sur, Global Greengrants Fund. (Grant No. 60-298) and by the Czech Science Foundation (Grant No. P505/12/G112) and by institutional support (RVO: 60077344, Institute of Parasitology, BC, CAS). GNN was supported by a PhD grant from the CONICET, Argentina.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All applicable institutional, national and international guidelines for the care and use of animals were followed.


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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • František Moravec
    • 1
    Email author
  • Gabriela N. Novacovsky
    • 2
  • Jesús S. Hernández-Orts
    • 3
  1. 1.Institute of ParasitologyBiology Centre of the Czech Academy of SciencesČeské BudějoviceCzech Republic
  2. 2.Centro para el Estudio de Sistemas Marinos (CESIMAR), CCT CENPAT, CONICETPuerto MadrynArgentina
  3. 3.Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos Almirante Storni (CIMAS - CCT CENPAT - CONICET)San Antonio OesteArgentina

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