Abstract
The microthrix pattern of common forms of the trypanorhynch cestode Prochristianella clarkeae Beveridge, 1990 on which the microscopically visible microtriches almost extended to the posterior end of the scolex was described using SEM and compared to other forms for which this pattern was different. The proximal bothrial surface and the scolex peduncle of all the examined specimens were covered with palmate spinitriches and papilliform filitriches. Unlike the common specimens of P. clarkeae, on the surface of those specimens with unusual distributions of microtriches as well as those on which the microscopically visible microtriches were not observable, palmate spinitriches extended to the mid-pars vaginalis and not to the posterior end of the scolex. Statistical tests did not detect any significant difference in the measurements of the specimens possessing different microthrix patterns. Furthermore, the partial 28S rDNA confirmed that the different forms were conspecific and that P. clarkeae possesses an intraspecific variation in the distribution of palmate spinitriches. Pastinachus sephen as a new host record was also established for Prochristianella clarkeae reported for the first time from the Persian Gulf.
Similar content being viewed by others
References
Beveridge, I. 1990. Taxonomic revision of Australian Eutetra-rhynchidae Guiart (Cestoda: Trypanorhyncha). Invertebrate Taxonomy, 4, 785–845
Carpenter, K.E., Krupp, F., Jones, D.A., Zajonz, U. (Eds) 1997. FAO Species Identification Field Guide for Fishery Purposes. Living Marine Resources of Kuwait, Eastern Saudi Arabia, Bahrain, Qatar, and the United Arab Emirates. FAO, Rome, pp. 293
Chervy, L. 2009. Unified terminology for cestodes microtriches: A proposal from the participants of the International Workshops on Cestode Systematics i. 2002–2008. Folia Parasito-logica, 56, 199–230
Chilton, N.B., Gasser, R.B., Beveridge, I. 1995. Differences in a ribo-somal DNA sequence of morphologically indistinguishable species within the Hypodontus macropi complex (Nematoda: Strongyloidea). International Journal for Parasitology, 25, 647–651
Friggens, M.M., Duszynski, D.W. 2005. Four new cestode species from the spiral intestine of the round stingray. Urobatis hal-leri, in the northern Gulf of California, Mexico. Comparative Parasitology, 72, 136–149
Haseli, M. 2013. Trypanorhynch cestodes from elasmobranchs from the Gulf of Oman, with the description on Prochristianella garshaspi n. sp.(Eutetrarhynchidae). Systematic Parasitol-ogy, 85, 271–279
Haseli, M., Malek, M., Palm, H.W. 2010. Trypanorhynch cestodes of elasmobranchs from the Persian Gulf. Zootaxa, 2492, 28–48
Lockyer, A.E., Olson, P.D., Littlewood, D.T.J. 2003. Utility of complete large and small subunit rRNA genes in resolving the phylogeny of the Neodermata (Platyhelminthes): implications and a review of the cercomer theory. Biological Journal of the Linnean Society, 78, 155–171
Olson, P.D., Caira, J.N., Jensen, K., Overstreet, R.M., Palm, H.W., Beveridge, I. 2010. Evolution of the trypanorhynch tapeworms: parasite phylogeny supports independent lineages of sharks and rays. International Journal for Parasitology, 40, 223–242
Olson, P.D., Tkach, V.V. 2005. Advances and trends in the molecular systematics of the parasitic Platyhelminthes. Advances in Par-asitology, 60, 165–243
Palm, H.W. (Ed) 2004. The Trypanorhyncha Diesing, 1863. PKSPL-IPB Press, Bogor. pp. 710
Schaeffner, B.C., Beveridge, I. 2012. Prochristianella Dollfus, 1946 (Trypanorhyncha: Eutetrarhynchidae) from elasmobranchs off Borneo and Australia, including new records and the description of four new species. Zootaxa, 3505, 1–25
Schaeffner, B.C., Beveridge, I. 2013. Prochristianella mattisi sp. n. (Trypanorhyncha: Eutetrarhynchidae) from the wedgenose skate. Dipturus whitleyi (Rajiformes: Rajidae), from Tasmania (Australia). Folia Parasitologica, 60, 257–263
Schaeffner, B.C., Beveridge, I. 2014. The trypanorhynch cestode fauna of Borneo. Zootaxa, 3900, 21–49
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Salmani, S., Haseli, M. Prochristianella clarkeae Beveridge, 1990 (Eutetrarhynchidae): a species complex or a species with intraspecific variation in the distribution of its tegumental microtriches?. Acta Parasit. 62, 69–75 (2017). https://doi.org/10.1515/ap-2017-0008
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1515/ap-2017-0008