Systematic Parasitology

, Volume 47, Issue 2, pp 135–143 | Cite as

Two new species of Duplicibothrium Williams & Campbell, 1978 (Tetraphyllidea: Serendipidae) from the Pacific cownose ray Rhinoptera steindachneri

  • T.R. Ruhnke
  • S.S. Curran
  • T. Holbert


Two new tetraphyllidean species, Duplicibothrium cairae n. sp. and D. paulum n. sp., are described from Pacific cownose rays Rhinoptera steindachneri collected from the Gulf of California. D. cairae n. sp. differs from the only other known species in this genus, D. minutum, in its possession of two posteriorly bifurcating longitudinal septa on each bothridium and having a greater number of loculi per bothridium, wider bothridia and a greater number of segments per worm. D. paulum n. sp. differs from the above two species in being shorter, having two continuous longitudinal septa on each bothridium, rather than posteriorly bifurcating or absent longitudinal septa, having a greater number of loculi per bothridium and having fewer segments per worm. The generic diagnosis of Duplicibothrium is amended to reflect the inclusion of the two new species. Species of Duplicibothriumappear to be restricted to host species of the genus Rhinoptera. Systematic information gained from the study of these two new species supports the monophyly of the tetraphyllidean family Serendipidae and suggests that Duplicibothrium shares a phylogenetic heritage with species in the genera Glyphobothrium and Serendip, taxa that are also parasitic in cownose rays. Evidence for a phylogenetic relationship between serendipid species and species of Dioecotaenia is discussed, as are potential molluscan hosts for cestode species in Duplicibothrium and Dioecotaenia.


Phylogenetic Relationship Host Species Systematic Information Generic Diagnosis Cestode Species 
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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • T.R. Ruhnke
    • 1
  • S.S. Curran
    • 2
  • T. Holbert
    • 1
  1. 1.Department of BiologyWest Virginia State College, InstituteWest Virginia USA
  2. 2.Gulf Coast Research LaboratoryOcean SpringsUSA

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