Folia Parasitologica, vol. 58 (2011), issue 3

Folia Parasitologica 58[3] 178-186 (2011) | 10.14411/fp.2011.018

Descriptions of two new freshwater Neotropical species of Rhinebothrium (Cestoda: Rhinebothriidea) from Potamotrygon motoro (Chondrichthyes: Potamotrygonidae)

Adriana Menoret1,2, Verónica A. Ivanov1,2
1 Laboratorio de Helmintología, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 4, C1428EHA, Buenos Aires, Argentina
2 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina

Two new species of Rhinebothrium (Cestoda, Rhinebothriidea) from potamotrygonid stingrays in the Neotropical region are herein described, which raises the total number of Rhinebothrium species known from Neotropical freshwaters to five. Rhinebothrium corbatai sp. n., and Rhinebothrium mistyae sp. n. were both collected from Potamotrygon motoro (Müller et Henle), captured in four tributaries of the Paraná River in Santa Fé Province, Argentina. The new species can be distinguished from their congeners, and from each other, by a combination of various features, including worm size (length and number of proglottids), number of loculi per bothridium, microthrix pattern, size of the cirrus sac, and the extent of the vas deferens. The discovery of these new species from P. motoro supports the pattern of high host specificity in this cestode genus, and reinforces the notion that some of the previous records of the enigmatic R. paratrygoni may correspond to new species of Rhinebothrium yet to be described.

Keywords: Rhinebothrium corbatai, Rhinebothrium mistyae, Santa Fé, Paraná River basin, Argentina

Received: October 22, 2010; Accepted: March 1, 2011; Published: September 21, 2011


References

  1. Brooks D.R., Amato J.F.R. 1992: Cestode parasites in Potamotrygon motoro (Natterer) (Chondrichthyes: Potamotrygonidae) from Southwestern Brazil, including Rhinebothroides mclennanae n. sp. (Tetraphyllidea: Phyllobothriidae), and the revised host-parasite checklist for helminths inhabiting Neotropical freshwater stingrays. J. Parasitol. 48: 43-64 Go to original source... Go to PubMed...
  2. Brooks D.R., Thorson T.B., Mayes M.A. 1981: Freshwater stingrays (Potamotrygonidae) and their helminth parasites: testing hypotheses of evolution and coevolution. In: V.A. Funk and D.R. Brooks (Eds.), Advances in Cladistics: Proceedings of the Willi Henning Society. New York, USA, pp. 147-175
  3. Carvalho M.R., Lovejoy N.R., Sosa R.S. 2003: Family Potamotrygonidae (River stingrays). In: R.E. Reis, O. Kullander and C.J. Ferraris (Eds.), Check List of the Freshwater Fishes of South and Central America. Porto Alegre, Brazil, pp. 22-28
  4. Chervy L. 2009: Unified terminology for cestode microtriches: a proposal from the International Workshops on Cestode Systematics in 2002-2008. Folia Parasitol. 56: 199-230 Go to original source... Go to PubMed...
  5. Froese R., Pauly D. ( Eds.) 2011: FishBase. World Wide Web electronic publication. www.fishbase.org, version (2/2011)
  6. Healy C.J. 2006: Three new species of Rhinebothrium (Cestoda: Tetraphyllidea) from the freshwater whipray, Himantura chaophraya, in Malaysian Borneo. J. Parasitol. 92: 364-374 Go to original source... Go to PubMed...
  7. Healy C.J., Caira J.N., Jensen K., Webster L., Littlewood D.T.J. 2009: Proposal for a new tapeworm order, Rhinebothriidea. Int. J. Parasitol. 39: 497-511 Go to original source... Go to PubMed...
  8. Marques F.P.L. 2000: Evolution of Neotropical freshwater stingrays and their parasites: taking into account space and time. PhD thesis. University of Toronto, Canada, 325 pp
  9. Menoret A., Ivanov V.A. 2009: A new species of tetraphyllidean (Cestoda) from the largespot river stingray, Potamotrygon falkneri (Potamotrygonidae: Chondrichthyes), from the Parana Basin. J. Parasitol. 95: 994-999 Go to original source... Go to PubMed...
  10. Rego A.A., Dias A.P.L. 1976: Estudos de cestoides de peixes do Brasil. 3ª nota: Cestoides de raias fluviais Paratrygonidae. R. Bras. Biol. 36: 941- 956
  11. Reyda F.B. 2008: Intestinal helminths of freshwater stingrays in southeastern Peru, and a new genus and two new species of cestode. J. Parasitol. 94: 684-699 Go to original source... Go to PubMed...
  12. Rosa R.S., Carvalho M.R., Wanderley C.A. 2008: Potamotrygon boesemani (Chondrichthyes: Myliobatiformes: Potamotrygonidae), a new species of Neotropical freshwater stingray from Surinam. Neotrop. Ichthyol. 6: 1-8