Systematic Parasitology

, Volume 19, Issue 1, pp 25–32 | Cite as

Morphological investigations into Floriceps minacanthus (Trypanorhyncha: Lacistorhynchidae) with analysis of the systematic utility of scolex microtriches

  • Cynthia Richmond
  • J. N. Caira


Specimens of Floriceps minacanthus Campbell & Beveridge, 1987 are reported from Carcharhinus melanopterus (Quoy & Gaimard, 1824) taken in the waters surrounding the island of Kirimati in the Republic of Kiribati in the Central Pacific Ocean. This represents a new host and a new locality record. The description of this species is expanded to include the presence of an ovary which is bilobed in cross section and a hermaphroditic duct. The surface features were examined by scanning electron microscopy. With the exception of the lateral margins of the bothridia and the apical region of the scolex, the scolex was found to be covered with palmate microtriches interspersed with filiform microtriches. The palmate microtriches varied in number of digitiform extensions depending on location. Elongate, bifid microtriches were present in the transition zone between the proximal and distal surfaces along the lateral margins of the bothridia. The apical region of the scolex was covered with filiform microtriches. The surface of the anterior margin of the strobila was covered with broad, flattened scale-like structures. The pattern of microthrix distribution was repeated for each of the bothridia of an individual, and this pattern was intraspecifically invariable. Comparison of our results with those from the seven other trypanorhynch species examined by previous authors with SEM indicates that there is much interspecific variability in both the morphology of microtriches present as well as their location on the scolex. This, coupled with the lack of intraspecific variability, confirms that these structures are systematically informative.


Apical Region Distal Surface Locality Record Vitelline Follicle Proximal Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Andersen, K. (1987) S.E.M. observations on plerocercus larvae of Floriceps saccatus Cuvier, 1817 and Molicola horridus (Goodsir, 1841) (Cestoda; Trypanorhyncha) from sunfish (Mola mola). Fauna Norvegica, 8, 25–28.Google Scholar
  2. Beveridge, I. & Campbell, R.A. (1989) Chimaerarhynchus n. g. and Patellobothrium n. g., two new genera of trypanorhynch cestodes with unique poeciloacanthous armatures, and a reorganisation of the poeciloacanthous trypanorhynch families. Systematic Parasitology, 14, 209–225.CrossRefGoogle Scholar
  3. Campbell, R.A. & Beveridge, I. (1987) Floriceps minacanthus sp. nov. (Cestoda; Trypanorhyncha) from Australian fishes. Transactions of the Royal Society of South Australia, 3, 189–194.Google Scholar
  4. Carvajal, J., Barros, C. & Whittaker, F.H. (1987) Scanning electron microscopy of the scolex of the plerocercous Callitetrarhynchus gracilis (Rudolphi, 1819) (Cestoda: Trypanorhyncha). Journal of Parasitology, 73, 1265–1267.CrossRefGoogle Scholar
  5. Halton, D.W. & McKerr, G. (1979) SEM observations on the spiral valve of rays and their cestode parasites. Parasitology, 79, xlvii.Google Scholar
  6. Linton, E. (1921) Rhynchobothrium ingens spec. nov. a parasite of the dusky shark (Carcharhinus obscurus). Journal of Parasitology, 8, 22–32.CrossRefGoogle Scholar
  7. McCullough, J.S. & Fairweather, I. (1983) A SEM study of the cestodes Trilocularia acanthiaevulgaris, Phyllobothrium squali and Gilquinia squali from the spiny dogfish. Zeitschrift für Parasitenkunde, 69, 655–665.CrossRefGoogle Scholar
  8. Shields, J.D. (1985) Surface morphology and description of Otobothrium kurisi new species (Cestoda: Trypanorhyncha) from a hammerhead shark Sphyrna lewini. International Journal for Parasitology, 15, 635–643.PubMedCrossRefGoogle Scholar
  9. Whittaker, F.H., Carvajal, J. & Apkarian, R.A. (1982) Scanning electron microscopy of the scolex of Grillotia dollfusi Carvajal 1971 (Cestoda; Trypanorhyncha). Journal of Parasitology, 68, 1173–1175.CrossRefGoogle Scholar
  10. Whittaker, F.H., Apkarian, R.P., Curless, B. & Carvajal, J. (1985) Scanning electron microscopy of the scolices of cestodes Parachristianella monomegacantha Kruse, 1959 (Trypanorhyncha) and Phyllobothrium sp. Beneden 1849 (Tetraphyllidea). Journal of Parasitology, 71, 376–381.CrossRefGoogle Scholar
  11. Wisner, M. (1987) Collecting and transporting black tip reef sharks. Freshwater and Marine Aquarium Magazine, 10, 16–17.Google Scholar
  12. Yamaguti, S. (1934) Studies on the helminth fauna of Japan. Part 4. Cestodes of fishes. Japanese Journal of Zoology, 6, 1–112.Google Scholar

Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Cynthia Richmond
    • 1
  • J. N. Caira
    • 1
  1. 1.Ecology and Evolutionary BiologyUniversity of ConnecticutStorrsUSA

Personalised recommendations