Skip to content
Licensed Unlicensed Requires Authentication Published by De Gruyter December 28, 2016

Prochristianella clarkeae Beveridge, 1990 (Eutetrarhynchidae): a species complex or a species with intraspecific variation in the distribution of its tegumental microtriches?

  • Safoora Salmani and Mohammad Haseli EMAIL logo
From the journal Acta Parasitologica


The microthrix pattern of common forms of the trypanorhynch cestode Prochristianella clarkeaeBeveridge, 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.


We are grateful to Professor Ian Beveridge from the University of Melbourne for kindly giving the unpublished information related to the original description of Prochristianella clarkeae. We also thank Mrs. Eileen Harris and Dr. Peter D. Olson from the Natural History Museum in London for kindly giving the related information of the only specimen of P. clarkeae from which the molecular data was available. Professor Janine N. Caira from the University of Connecticut is gratefully thanked since she kindly examined, using light microscopy, the only specimen of P. clarkeae for which the molecular data had been earlier registered in NCBI.


Beveridge I. 1990. Taxonomic revision of Australian Eutetrarhynchidae Guiart (Cestoda: Trypanorhyncha). Invertebrate Taxonomy, 4, 785–84510.1071/IT9900785Search in Google Scholar

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. 293Search in Google Scholar

Chervy L. 2009. Unified terminology for cestodes microtriches: A proposal from the participants of the International Workshops on Cestode Systematics in 2002–2008. Folia Parasitologica, 56,199–23010.14411/fp.2009.025Search in Google Scholar

Chilton N.B., Gasser R.B., Beveridge I. 1995. Differences in a ribosomal DNA sequence of morphologically indistinguishable species within the Hypodontus macropi complex (Nematoda: Strongyloidea). International Journal for Parasitology, 25, 647–65110.1016/0020-7519(94)00171-JSearch in Google Scholar

Friggens M.M., Duszynski D.W. 2005. Four new cestode species from the spiral intestine of the round stingray, Urobatis halleri, in the northern Gulf of California, Mexico. Comparative Parasitology, 72, 136–14910.1654/4121Search in Google Scholar

Haseli M. 2013. Trypanorhynch cestodes from elasmobranchs from the Gulf of Oman, with the description of Prochristianella garshaspi n. sp.(Eutetrarhynchidae). Systematic Parasitology, 85, 271–27910.1007/s11230-013-9425-8Search in Google Scholar

Haseli M., Malek M., Palm H.W. 2010. Trypanorhynch cestodes of elasmobranchs from the Persian Gulf. Zootaxa, 2492, 28–4810.11646/zootaxa.2492.1.2Search in Google Scholar

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, 155–17110.1046/j.1095-8312.2003.00141.xSearch in Google Scholar

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, 223–24210.1016/j.ijpara.2009.07.012Search in Google Scholar

Olson P.D., Tkach V.V. 2005. Advances and trends in the molecular systematics of the parasitic Platyhelminthes. Advances in Parasitology, 60, 165–24310.1016/S0065-308X(05)60003-6Search in Google Scholar

Palm H.W. (Ed.) 2004. The Trypanorhyncha Diesing, 1863. PKSPLIPB Press, Bogor. pp. 710Search in Google Scholar

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, 1–2510.11646/zootaxa.3505.1.1Search in Google Scholar

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, 257–26310.14411/fp.2013.029Search in Google Scholar PubMed

Schaeffner B.C., Beveridge I. 2014. The trypanorhynch cestode fauna of Borneo. Zootaxa, 3900, 21–4910.11646/zootaxa.3900.1.2Search in Google Scholar PubMed

Received: 2016-6-16
Revised: 2016-8-8
Accepted: 2016-9-29
Published Online: 2016-12-28
Published in Print: 2017-3-1

© 2017 W. Stefański Institute of Parasitology, PAS

Downloaded on 4.12.2023 from
Scroll to top button