Hydrobiologia

, Volume 546, Issue 1, pp 197–202 | Cite as

Trophi Structure in Bdelloid Rotifers

Article

Abstract

Bdelloids show a rather uniform morphology of jaws (trophi), named ramate. The most recognizable feature is the presence of a series of teeth forming unci plates. The unci are not uniform in size; each plate has 1–10 major median teeth. Using SEM pictures of trophi and data from the literature, we analyzed the number of major unci teeth in relation to trophi size, total number of teeth, and environmental features. Variability in the number of major unci teeth in bdelloids is not related to trophi size or to total number of unci teeth, while total number of unci teeth and trophi size seem to be related to each other: larger trophi in general have more teeth than smaller trophi. Few major teeth are more common in species living in water bodies where they possibly eat unicellular algae, while more major teeth are more common in species living outside water bodies, among mosses and lichens, where they possibly eat bacteria.

Keywords

Rotifera Bdelloidea jaws SEM 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bērziņš, B., Pejler, B. 1987Rotifer occurrence in relation to pHHydrobiologia147107116CrossRefGoogle Scholar
  2. Bērziņš, B., Pejler, B. 1989aRotifer occurrence and trophic degreeHydrobiologia182171180CrossRefGoogle Scholar
  3. Bērziņš, B., Pejler, B. 1989bRotifer occurrence in relation to oxygen contentHydrobiologia183165172CrossRefGoogle Scholar
  4. Donner, J. 1965Ordnung Bdelloidea (Rotifera, Rädertiere)Akademie VerlagBerlin297Google Scholar
  5. Fontaneto, D., Melone, G. 2003Redescription of Pleuretra hystrix, an endemic alpine bdelloid rotiferHydrobiologia497153160Google Scholar
  6. Fontaneto, D., Melone, G., Cardini, A. 2004Shape diversity in the trophi of different species of Rotaria (Rotifera, Bdelloidea): a geometric morphometric studyItalian Journal of Zoology716372Google Scholar
  7. Gosse, P. H. 1856On the structure, functions and homologies of the manducatory organs in the class RotiferaPhilosophical Transactions of the Royal Society of London146419452Google Scholar
  8. Koste, W. 1978Rotatoria. Die Rädertiere MitteleuropasBorntraeger Berlin 673Google Scholar
  9. Markevich, G. I. 1985Ultrathin morphology of mastax of rotifers. I. Bdelloida [in Russian]Bulletin of the Institute for the Biology of Inland Waters683135Google Scholar
  10. Markevich, G. I. 1989Morphology and the principle organization of sclerite system of the mastax in rotifers [in Russian]Proceedings of the Institute for the Biology of Inland Waters562782Google Scholar
  11. Markevich, G. I., Kutikova, L. A. 1989Mastax morphology under SEM and its usefulness in reconstructing rotifer phylogeny and systematicsHydrobiologia186/187285289CrossRefGoogle Scholar
  12. Melone, G., Ricci, C., Segers, H., Wallace, R. L. 1998aPhylogenetic relationships of phylum Rotifera with emphasis on the families of BdelloideaHydrobiologia388101107Google Scholar
  13. Melone, G., Ricci, C., Segers, H. 1998bThe trophi of Bdelloidea (Rotifera): a comparative study across the classCanadian Journal of Zoology7617551765CrossRefGoogle Scholar
  14. Ricci, C., Melone, G., Walsh, E. J. 2001A carnivorous bdelloid rotifer, Abrochtha carnivora n.spInvertebrate Biology120136141CrossRefGoogle Scholar
  15. Ricci, C., Shiel, R. J., Fontaneto, D., Melone, G. 2003Bdelloid rotifers recorded from Australia with description of Philodinavus aussiensis n.spZoologischer Anzeiger242241248Google Scholar
  16. Segers, H. 1993Rotifera of some lakes in the floodplain of the River Niger (Imo State, Nigeria). I. New species and other taxonomic considerationsHydrobiologia2503961Google Scholar
  17. Segers, H. 2002The nomenclature of the Rotifera: annotated checklist of valid family and genus–group namesJournal of Natural History36631640CrossRefGoogle Scholar
  18. Sørensen, M. V. 2002On the evolution and morphology of the rotiferan trophi, with a cladistic analysis of RotiferaJournal of Zoological Systematics and Evolutionary Research40129154CrossRefGoogle Scholar

Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Department of BiologyUniversity of Milan MilanItaly

Personalised recommendations