Abstract
In the course of phylogenetic investigations across Rotifera, we reinvestigated Proales sigmoidea (Skorikov, 1896) and found significant similarities with respect to its morphology, ecology and behaviour to Pleurotrocha petromyzon (Ehrenberg, 1830). Both species feed on stalked ciliates and show a similar habitus as well as similar virgate trophi. We here present new morphological details for both species based on light and electron micrographs. In light of our results, we suggest the reassignment of Proales sigmoidea to Pleurotrocha Ehrenberg, 1830. To further support our case, we provide additional comparisons with other species of the latter genus, including Pleurotrocha robusta (Glasscott, 1893), for which we present additional information.References
Bilfinger, L. (1894) Zur Rotatorien fauna Württembergs. 2. Beitrag. Jahreshefte des Vereins für vaterländische Naturkunde in Württemberg, 50, 35–65.
Budde, E. (1925) Die parasitischen Rädertiere mit besonderer Berücksichtigung der in der Umgebung von Minden I. W. beobachteten Arten. Zeitschrift für Morphologie und Ökologie der Tiere, 3, 706−784.
De Beauchamp, P. (1905) Remarques sur deux Rotifères parasites. Bulletin de la Société zoologique de France, 30, 117−124.
De Beauchamp, P. (1948) Sur deux espèces de Proales (Rotifères). Bulletin de la Société zoologique de France, 73, 136−140.
De Smet, W.H. (1996) Rotifera. Volume 4. The Proalidae (Monogononta). In: Nogrady, T. & Dumont, H.J. (Eds), Guides to the Identification of the Microinvertebrates of the Continental Waters of the World, 9. SBP Academic Publishing b.v. Amsterdam, New York, 102 pp.
De Smet, W.H. (1998) Preparation of rotifer trophi for light and scanning electron microscopy. Hydrobiologia, 387/388, 117−121.
Ehrenberg, C.G. (1830) Organisation, Systematik und geographisches Verhältnis der Infusionsthierchen. Abhandlungen der königlichen Akademie der Wissenschaften zu Berlin gehalten in den Jahren 1828 u. 1830, 1−108.
Ehrenberg, C.G. (1832) Über die Entwicklung und Lebensdauer der Infusionsthiere, nebst ferneren Beiträgen zu einer Vergleichung ihrer organischen Systeme. Abhandlungen der königlichen Akademie der Wissenschaften zu Berlin, 1−154, pl. 1−4.
Ehrenberg, C.G. (1838) Die Infusionsthierchen als vollkommende Organismen. Ein Blick in das tiefere organische Leben der Natur. Leopold Voss, Leipzig, 548 pp.
Fadeew, N.N. (1927) Matériaux pour la connaissance de la faune des rotifères del´ U.R.S.S. Travaux de la Société des Naturalistes de Charkov, 50, 141−155.
Fischer, C. & Ahlrichs, W.H. (2006) Cephalodella ungulata n. sp. (Monogononta: Notommatidae), a new rotifer species from North-West Germany, with notes on C. tenuiseta (Burn, 1890). Zootaxa 1378, 49−59.
Fontaneto, D. & Melone, G. (2003) Redescription of Pleuretra hystrix, an endemic alpine bdelloid rotifer. Hydrobiologia, 497, 153−160.
Glasscott, L.S. (1893) A list of some of the Rotifera of Ireland. Scientific Proceedings of the Royal Dublin Society new series, 8, 29–86.
Harring, H.K. (1913) Synopsis of the Rotatoria. Bulletin of the United States National Museum, Washington 81, 7−226.
Hudson, C.T. & Gosse, P.H. (1886) The Rotifera or Wheel-Animalcules, both British and foreign. London. Vol. 1, vi, 128 pp., Vol. 2, 144 pp.
Jennings, H.S. (1894) A list of the Rotatoria of the Great Lakes and some of the inland lakes of Michigan. Bulletin of the Michigan Fish Commission, 3, 1–34.
Jennings, H.S. (1896) Report on the Rotatoria with description of a new species. Bulletin of the Michigan Fish Commission, 1896, 1–9.
Kleinow, W., Klusemann, J. & Wratil, H. (1990) A gentle method for the preparation of hard parts (trophi) of the mastax of rotifers and scanning electron microscopy of the trophi of Brachionus plicatilis (Rotifera). Zoomorphology, 109, 329−336.
Koste, W. (1968) Über Proales sigmoidea (Skorikow, 1896) (eine für Mitteleuropa neue Art) und Proales daphnicola (Thompson, 1892). Archiv für Hydrobi ologie, 65, 240−245.
Koste, W. (1976) Über die Rädertierbestände (Rotatoria) der oberen und unteren mittleren Hase in den Jahren 1966−1969. Osnabrücker naturwissenschaftliche Mitteilungen, 4, 191−263.
Koste, W. (1978) Rotatoria. Die Rädertiere Mitteleuropas. Ein Bestimmungswerk, begründet von Max Voigt. Ueberordnung Monogononta, 2nd edn. I. Textband. Gebrüder Borntraeger, Berlin, Stuttgart, 673 pp.
Melone, G. (1998) The rotifer corona by SEM. Hydrobiologia, 387/388, 131−134.
Nogrady, T., Pourriot, R. & Segers, H. (1995) Rotifera 3: Notommatidae and Scaridae. In: T. Nogrady & H.J. Dumont (Eds.), Guides to the Identification of the Microinvertebrates of the Continental Waters of the World, 8. SBP Academic Publishing b.v., Amsterdam, New York, 248 pp.
Reiss, J. & Schmid-Araya, J.M. (2008) Existing in plenty: abundance, biomass and diversity of ciliates and meiofauna in small streams. Freshwater Biology, 53, 652−668.
Ricci, C., Melone, G. & Walsh, E. J. (2001) A carnivorous bdelloid rotifer, Abrochta carnivora n. sp. Invertebrate Biology, 120, 136−141.
Riemann, O. & Ahlrichs, W. H. 2008. Ultrastructure and function of the mastax in Dicranophorus forcipatus (Rotifera: Monogononta). Journal of Morphology 269: 698–712.
Riemann, O., Wilts, E.F., Ahlrichs, W.H. & Kieneke, A. (In press). Body musculature of Beauchampiella eudactylota (Gosse, 1886) (Rotifera: Euchlanidae) with additional new data on its trophi and overall morphology. Acta Zoologica.
Skorikov, A.S. (1896) Rotateurs des environs de Kharkow. Travaux de la Societe de Naturalistes des Charkov, 30, 207−774.
Sørensen, M. V. (2002) On the evolution and morphology of the rotiferan trophi, with a cladistic analysis of Rotifera. Journal of Zoological Systematics and Evolutionary Research, 40, 129–154.
Sørensen, M.V. (2005) Musculature in three species of Proales (Monogononta, Rotifera) stained with phalloidin-labeled fluorescent dye. Zoomorphology, 124, 47−55.
Wallace, R. L. (2002) Rotifers: Exquisite metazoans. The Society for Integrative and Comparative Biology, 42, 660−667.
Wulfert, K. (1935) Beiträge zur Kenntnis der Rädertierfauna Deutschlands. I. Teil. Archiv für Hydrobiologie, 2, 583−602.
Zavadovsky, M.M. (1926) Rotifers of the family Notommatidae from the area of the hydrobiological station Zwenigorodskoj. Trudy Laboratorii éksperimental’noĭ biologii Moskovskogo zooparka, 2, 261–295.