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Eutetrarhynchus pacificus n. sp. (Cestoda: Trypanorhyncha) from Raja inornata Jordan & Gilbert (Batoidea: Rajiformes) off the coast of California with comments on congeners

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Abstract

Eutetrarhynchus pacificus n. sp. is described from the spiral valve of Raja inornata Jordan & Gilbert off the coast of California, USA. The new species is distinguished from E. ruficollis (Eysenhardt, 1829) and E. leucomelanus (Shipley & Hornell, 1906) in having acraspedote rather than craspedote segments and a saccate rather than a branched uterus. It is distinguished from E. platycephali Palm, 2004 in lacking an enlarged hook in the eighth row of the basal armature and from E. beveridgei Schaeffner, 2013, which has a basal swelling and a distinctive basal armature. A partial redescription of E. ruficollis, the type-species of the genus, is provided based on available museum specimens, highlighting the need for a comprehensive redescription of this species to better define the characteristics of the genus. The presence of an undescribed species in museum collections is also noted. Based on the 28S ribosomal gene, the new species clustered with Dollfusiella in a molecular phylogenetic tree. The delimitation of Eutetrarhynchus and its relationship with Dollfusiella is discussed.

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Acknowledgements

We wish to thank Eileen Harris (BMNH) for the loan of specimens, Dr Jean Mariaux (MHNG) for his hospitality and access to collections in Geneva and Dr M.-C. Durette-Desset for her hospitality while visiting MNHN. Dr Shana Goffredi, Occidental College, kindly provided the 28S sequence data. Thanks are extended to Mr. Bill Powers with the Los Angeles County Sanitation District and to Mr. Ken Sakamoto and Dr. Danny Tang with Orange County Sanitation District for the collection of skates. We would also like to thank Dr Allison van de Meena from the Biosciences Microscopy unit, Melbourne University for her advice and assistance with the scanning electron microscopy.

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Authors and Affiliations

  1. Department of Veterinary Biosciences, Faculty of Veterinary and Agricultural Science, Veterinary Clinical Centre, University of Melbourne, Werribee, 3030, VIC, Australia

    Ian Beveridge

  2. Department of Veterinary Biosciences, Faculty of Veterinary and Agricultural Science, University of Melbourne, Parkville, 3052, VIC, Australia

    Anson Koehler

  3. Cabrillo Marine Aquarium, 3720 Stephen M. White Drive, San Pedro, CA, 90731, USA

    Ralph G. Appy

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  1. Ian Beveridge
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  2. Anson Koehler
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  3. Ralph G. Appy
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Correspondence to Ian Beveridge.

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All applicable national standards and guidelines for the use of animals were followed in this study. Fish were collected under California Department of Fish and Wildlife Permit No. S-190160006-19016-001.

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The authors declare that they have no conflict of interest.

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Beveridge, I., Koehler, A. & Appy, R.G. Eutetrarhynchus pacificus n. sp. (Cestoda: Trypanorhyncha) from Raja inornata Jordan & Gilbert (Batoidea: Rajiformes) off the coast of California with comments on congeners. Syst Parasitol 98, 291–305 (2021). https://doi.org/10.1007/s11230-021-09978-0

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