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Parasitology Research

, Volume 104, Issue 1, pp 27–33 | Cite as

Macroderoides texanus n. sp. (Digenea: Macroderoididae) from alligator gar, Atractosteus spatula in Texas

  • Vasyl V. TkachEmail author
  • Eric J. Strand
  • LeAnne Froese
Original Paper

Abstract

Macroderoides texanus n. sp. is described based on 16 specimens collected from the intestine of the North American alligator gar, Atractosteus spatula. Of the five established species of Macroderoides, the new species is morphologically most similar to Macroderoides spiniferus and Macroderoides trilobatus. M. texanus n. sp. differs from M. spiniferus by having the ovary situated immediately posterior to the cirrus sac rather than at mid-way between the cirrus sac and anterior testis, the ventral sucker situated further posteriorly, and the vitelline fields extending somewhat posterior to posterior testis rather than to the middle of posterior testis. M. texanus n. sp. differs from M. trilobatus by having the ovary positioned immediately adjacent to, or overlapping the cirrus sac rather than at some distance posterior to it, and by having significantly larger eggs. Additionally, the new species has two distinctive rows of spines on the postero-ventral surface of the oral sucker that are lacking in M. spiniferus and M. trilobatus. Comparison of approximately 2,700-base-pair sequences of nuclear rDNA (partial 18S, complete ITS region and partial 28S) from M. texanus n. sp., M. spiniferus and M. trilobatus, strongly supports the status of M. texanus n. sp. as a new species.

Keywords

Ventral Sucker Oral Sucker ITS1 Region Genital Atrium Anterior Testis 
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.

Notes

Acknowledgments

The authors sincerely thank Andres Soto (Texas A&M University, Kingsville), Stephen Curran (Gulf Coast Research Laboratory, University of Southern Mississippi) and Scott Snyder (University of Nebraska at Omaha) for their help in the field. Eric Hoberg and Patricia Pillitt arranged a loan of type and voucher specimens from the U.S. National Parasite collection. This work was supported by The Systematic Research Fund of The Linnean Society of London and the Systematics Association (UK) for Vasyl Tkach and LeAnne Froese, and ND EPSCoR AURA (Advanced Undergraduate Research Assistanships) for Eric Strand. All experiments and procedures described in this publication were in compliance with current laws of the states in which they were performed.

References

  1. Arratia G (2000) Phylogenetic relationships of Teleostei. Past and present. Estudios Oceanológicos 19:19–51Google Scholar
  2. Hall TA (1999) BioEdit: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/NT. Nucleic Acids Sym Ser 41:95–98Google Scholar
  3. Hunter GW (1932) A new trematode (Plesiocreadium parvum, sp. nov.) from fresh water fish. Trans Am Microsc Soc 51:16–21CrossRefGoogle Scholar
  4. Hurley IA, Mueller RL, Dunn KA, Schmidt EJ, Friedman M, Ho RK, Prince VE, Yang Z, Thomas MG, Coates MI (2007) A new time-scale for ray-finned fish evolution. Proc Biol Sci B 274:489–498CrossRefGoogle Scholar
  5. Nolan MJ, Cribb TH (2005) The use and implications of ribosomal DNA sequencing for the discrimination of digenean species. Adv Parasitol 60:101–163PubMedCrossRefGoogle Scholar
  6. Olson PD, Tkach VV (2005) Advances and trends in the molecular systematics of the parasitic platyhelminthes. Adv Parasitol 60:165–243PubMedCrossRefGoogle Scholar
  7. Pearse A (1924) Observations on parasitic worms from Wisconsin fishes. Trans Wis Acad Sci Arts Lett 21:148–149Google Scholar
  8. Platt TR, Tkach VV (2003) Two new species of Choanocotyle Jue Sue and Platt, 1998 (Digenea: Choanocotylidae) from an Australian freshwater turtle (Testudines: Pleurodira: Chelidae). J Parasitol 89:145–150PubMedCrossRefGoogle Scholar
  9. Salgado-Maldonado G, Moravec F, Cabañas-Carranza G, Aguilar-Aguilar R, Sánchez-Nava P, Báez-Valé R, Scholz T (2004) Helminths parasites of the Tropical Gar, Atractosteus tropicus, from Tabasco, Mexico. J Parasitol 90:260–265PubMedCrossRefGoogle Scholar
  10. Snyder SD, Tkach VV (2001) Phylogenetic and biogeographical relationships among some holarctic frog lung flukes (Digenea: Haematoloechidae). J Parasitol 87:1433–1440PubMedGoogle Scholar
  11. Steel RGD, Torrie JH (1980) Principles and procedures of statistics. McGraw-Hill, New York, p 633Google Scholar
  12. Taylor P (1978) Macroderoides trilobatus sp. n. (Digenea: Macroderoides) from the bowfin, Amia calva, and emendation of the genus. J Parasitol 64:393–394CrossRefGoogle Scholar
  13. Tkach VV, Pawlowski J (1999) A new method of DNA extraction from the ethanol-fixed parasitic worms. Acta Parasitol 44:147–148Google Scholar
  14. Tkach VV, Snyder SD (2007a) Aptorchis megacetabulus n. sp. (Digenea: Plagiorchioidea) from the Northern Long-Necked Turtle, Chelodina rugosa, (Pleurodira: Chelidae) in Australia. J Parasitol 93:404–408PubMedCrossRefGoogle Scholar
  15. Tkach VV, Snyder SD (2007b) Choanocotyle platti n. sp. from the northern long-necked turtle, Chelodina rugosa (Pleurodira: Chelidae) in Australia. Acta Parasitol 52:318–324CrossRefGoogle Scholar
  16. Tkach VV, Snyder SD (2008) Aptorchis glandularis n. sp. (Digenea: Plagiorchioidea) from the northwestern red-faced turtle, Emydura australis (Pleurodira: Chelidae) in the Kimberley, Western Australia. J Parasitol 94:918–924PubMedCrossRefGoogle Scholar
  17. Tkach VV, Pawlowski J, Sharpilo VP (2000) Molecular and morphological differentiation between species of the Plagiorchis vespertilionis group (Digenea, Plagiorchiidae) occurring in European bats, with a re-description of P. vespertilionis (Muller, 1780). Syst Parasitol 47:9–22PubMedCrossRefGoogle Scholar
  18. Tkach VV, Littlewood DTJ, Olson PD, Kinsella JM, Swiderski Z (2003) Molecular phylogenetic analysis of the Microphalloidea Ward, 1901 (Trematoda: Digenea). Syst Parasitol 56:1–15PubMedCrossRefGoogle Scholar
  19. Van Cleave HJ, Mueller JF (1932) Parasites of Oneida Lake fishes. Part I. Descriptions of new genera and new species. Roosevelt Wild Life Ann 3:1–72Google Scholar
  20. Winfield GF (1929) Plesiocreadium typicum, a new trematode from Amia calva. J Parasitol 16:81–87CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Vasyl V. Tkach
    • 1
    Email author
  • Eric J. Strand
    • 1
  • LeAnne Froese
    • 1
  1. 1.Department of BiologyUniversity of North DakotaGrand ForksUSA

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