Systematic Parasitology

, Volume 96, Issue 1, pp 95–110 | Cite as

Morphological and molecular evidence for synonymy of Corynosoma obtuscens Lincicome, 1943 with Corynosoma australe Johnston, 1937 (Acanthocephala: Polymorphidae)

  • Olga I. Lisitsyna
  • Olena KudlaiEmail author
  • Terry R. Spraker
  • Vasyl V. Tkach
  • Lesley R. Smales
  • Tetiana A. Kuzmina
Part of the following topical collections:
  1. Acanthocephala


Corynosoma obtuscens Lincicome, 1943 (Acanthocephala: Polymorphidae) is synonymised with Corynosoma australe Johnston, 1937 based on combined morphological and molecular evidence. Morphological comparison of C. obtuscens (24 males and 27 females) collected from a California sea lion Zalophus californianus (Lesson) in California, USA, with the type-specimens of C. obtuscens and C. australe, and with published data on C. australe collected from different hosts and regions showed no significant differences. The levels of genetic divergence in the cox1 sequences obtained from C. obtuscens from a California sea lion in the present study and C. australe from otariid seals from Argentina and penguins from Brazil ranged between 1.4–1.6% and was considered to represent intraspecific variability. Additionally, cox1 sequences were generated for Andracantha phalacrocoracis (Yamaguti, 1939), Corynosoma semerme (Forssell, 1904), C. strumosum (Rudolphi, 1802), C. validum Van Cleave, 1953 and C. villosum Van Cleave, 1953. Our results revealed inconsistency in the identification of material used as a source of the previously published sequence data for C. obtuscens and C. magdaleni Montreuil, 1958.



The authors thank Dr Frances Gulland, Christine Fontaine, Barbie Halaska, and other colleagues from the Marine Mammal Center (TMMC), Sausalito, California, for their help in parasitological examination of dead California sea lions. The authors thank Dr Yuriy Kuzmin from the Institute of Zoology NAS of Ukraine for his useful comments and assistance with preparation of the manuscript. The images of helminths were made at the Center of collective use of scientific equipment “Animalia” (I. I. Schmalhausen Institute of Zoology NAS of Ukraine).


This study was partially supported by the North-West University, South Africa to OK.

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.

Supplementary material

11230_2018_9830_MOESM1_ESM.pdf (716 kb)
Supplementary material 1 (PDF 716 kb)


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© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.I. I. Schmalhausen Institute of Zoology NAS of UkraineKyivUkraine
  2. 2.Institute of Ecology, Nature Research CentreVilniusLithuania
  3. 3.Water Research Group, Unit for Environmental Sciences and ManagementNorth-West UniversityPotchefstroomSouth Africa
  4. 4.Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical SciencesColorado State UniversityFort CollinsUSA
  5. 5.Department of BiologyUniversity of North DakotaGrand ForksUSA
  6. 6.Parasitology SectionSouth Australian MuseumAdelaideAustralia

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