Parasitology Research

, Volume 116, Issue 7, pp 1989–1999 | Cite as

Morphological and molecular evidence for a new species of Pseudanisakis Layman & Borovkova, 1926 (Nematoda: Ascaridida), parasitizing Rajiformes in southern Southwest Atlantic waters

  • Manuel M. IrigoitiaEmail author
  • Paola E. Braicovich
  • Marisa D. Farber
  • Juan T. Timi
Original Paper


Pseudanisakis argentinensis n. sp. is proposed to accommodate parasitic nematodes found in six skate species (Rajidae and Arhynchobatidae) examined from southern Southwest Atlantic waters. The new species differs from its congeners by the following combination of characters: a cupola on each lip, males with 8–12 pairs of precloacal genital papillae, a larger size for both males and females, a greater length-to-breadth ratio of the ventriculus and the presence of a small knob on the tip of the tail. Allometric growth was observed for several morphometric features; however, the slopes of the allometric relationships across host species exhibited non-significant differences and were considered as a strong evidence for conspecificity. Congruent results were obtained after the genetic characterization of the mitochondrial cytochrome c oxidase subunit 1 gene of worms obtained from different skate species, whose values of genetic divergence (1.3) lay within the range of intraspecific variation. Previous records of specimens referred to as Pseudanisakis tricupola in skates from South American waters are regarded as conspecific with P. argentinensis n. sp.


Pseudanisakis Nematoda Systematics Allometric growth Psammobatis Sympterygia Bathyraja Atlantoraja Amblyraja Argentine Sea 



Thanks are extended to the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) and the Industrias El Corsario A.A., Mar del Plata, for providing fish samples, and to Dr. Santiago Barbini (IIMyC), Dr. Lorena Scenna (IIMyC) and Dr. Daniel Figueroa (UNMdP) for helping in the identification of skates and providing literature on chondrichthyans. Special thanks are due to the two anonymous reviewers for their valuable comments that helped to improve this article. Financial support was provided by grants from Consejo Nacional de Investigaciones Científicas y Técnicas (PIP No. 112-201501-00973), the Fondo para la Investigación Científica y Tecnológica (PICT 2015 No. 2013) and the Universidad Nacional de Mar del Plata (EXA 869/16). This work is part of the Doctoral Thesis of M.M.I., carried out in the Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Manuel M. Irigoitia
    • 1
    Email author
  • Paola E. Braicovich
    • 1
  • Marisa D. Farber
    • 2
  • Juan T. Timi
    • 1
  1. 1.Laboratorio de Ictioparasitología, Facultad de Ciencias Exactas y NaturalesUniversidad Nacional de Mar del Plata (UNMdP), Instituto de Investigaciones Marinas y Costeras (IIMyC)Mar del PlataArgentina
  2. 2.Instituto de BiotecnologíaInstituto Nacional de Tecnología Agropecuaria (INTA)HurlinghamArgentina

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