Schizorhynchia Meixner, 1928 (Platyhelminthes, Rhabdocoela) of the Iberian Peninsula, with a description of four new species from Portugal

Stefan Gobert, Marlies Monnens, Lise Eerdekens, Ernest Schockaert, Patrick Reygel, Tom Artois


During several sampling campaigns in the regions of Galicia and Andalusia in Spain and the Algarve region in Portugal, specimens of twelve species of schizorhynch rhabdocoels were collected. Four of these are new to science: three species of Proschizorhynchus (P. algarvensis sp. nov., P. arnautsae sp. nov. and P. troglodytus sp. nov.) and one species of Schizochilus (S. coninxae sp. nov.). The new species of Proschizorhynchus can be distinguished from their congeners by the curvature and length of their stylet, as well as the cirrus sheath and the organisation of the genital system. Schizochilus coninxae sp. nov. has a distinct two-part stylet that is unique within the genus. In addition to these new species, new data are reported for the diascorhynchid Diascorhynchus caligatus and the schizorhynchids Carcharodorhynchus multidentatus, C. tenuis, C. flavidus, Proschizorhynchus pectinatus and P. reniformis. Finally, new records for C. flavidus from the Hawaiian archipelago are presented.


Kalyptorhynchia; microturbellarians; meiobenthos; systematics; taxonomy

Full Text:




Ax P. 1959. Zür Systematik, Ökologie und Tiergeographie der Turbellarienfauna in den ponto-kaspischen Brackwassergebieten. Zoologische Jahrbücher: Abteilung für Systematik, Ökologie und Geographie der Tiere 87: 43–184.

Boaden P.J.S. 1995. Where Turbellaria? Concerning knowledge and ignorance of marine turbellarian ecology. Hydrobiologia 305: 91–99.

Brunet M. 1967. Turbellariés schizorhynques de la région de Marseille. Sur Carcharodorhynchus subterraneus et Carcharodorhynchus flavidus nov. sp. Bulletin de la société zoologique de France 92: 143–152.

Brunet M. 1970. Turbellariés Schizorhynchidae de sables infralittoraux de la côte Marseillaise. Cahiers de Biologie Marine 11: 279–306.

Brunet M. 1979. Turbellaires Calyptorhynques du Golfe de Marseille. Revue de Biologie et Écologie méditerranéenne 6: 101–120.

de Beauchamp P. 1927. Rhabdocoeles des sables à diatomées d’Arcachon I. Coup d’œil sur l’association Schizorhynchidae. Bulletin de la société zoologique de France 52: 351–386.

Farías F., Gamo J. & Noreña-Janssen C. 1995. Nuevas aportaciones al conocimiento de los microturbelarios de la Península Ibérica. Graellsia 51: 93–100.

Gamo J. & Noreña-Janssen C. 1998. Old and new records of turbellarians from the central areas of Spain. Hydrobiologia 383: 299–305.

Gieysztor M. 1931. Contribution à la connaissance des Turbellariés Rhabdocoèles (Turbellaria Rhabdocoela) d’Espagne. Bulletin de l’Académie Polonaise des Sciences et des Lettres, Classe des Sciences Mathematiques et Naturelles B 2: 125–153.

Gobert S., Reygel P. & Artois T. 2017. Schizorhynchia (Platyhelminthes Rhabdocoela) of Lanzarote (Canary Islands), with the description of eight new species. Marine Biodiversity.

l’Hardy J.-P. 1965. Turbellaries Schizorhynchidae des sables de Roscoff II. Le genre Proschizorhynchus. Cahiers de Biologie Marine 6: 135–161.

Martens P.M. & Schockaert E.R. 1986. The importance of turbellarians in the marine meiobenthos: a review. Hydrobiologia 132: 295–303.

Noldt U. 1985. Typhlorhynchus syltensis n. sp. (Schizorhynchia, Plathelminthes) and the Adelphotaxa-relationship of Typhlorhynchus and Proschizorhynchus. Microfauna Marina 2: 347–370.

Noldt U. & Hoxhold S. 1984. Interstitielle Fauna von Galapagos. XXXIV. Schizorhynchia (Plathelminthes, Kalyptorhynchia). Microfauna Marina 1: 199–256.

Noreña C., del Campo A. & del Real M. 1999. Taxonomy and morphology of limnic microturbellarians (Plathelminthes) in Extremadura (Spain). Hydrobiologia 397: 21–28.

Noreña C., Damborenea C., Faubel A. & Brusa F. 2007. Composition of meiobenthonic Platyhelminthes from brackish environments of the Galician and Cantabrian coasts of Spain with the description of a new species of Djeziraia (Polycystididae, Kalyptorhynchia). Journal of Natural History 41: 1989–2005.

Schockaert E.R. 1996. Turbellarians. In: Hall G.S. (ed.) Methods for the Examination of Organismal Diversity in Soils and Sediments: 211–225. CAB International, UK.

Schockaert E.R. 2014. Marine Macrostomorpha (Platyhelminthes, Rhabditophora) from the Algarve (Southern Portugal). Zootaxa 3872: 577–590.

Schockaert E.R., Jouk P.E.H. & Martens P.M. 1989. Free-living Plathelminthes from the Belgian coast and adjacent areas. In: Wouters K. & Baert L. (eds) Proceedings of the Symposium “Invertebrates of Belgium”: 19–25. Institut royal des Sciences naturelles de Belgique, Brussels.

Schockaert E.R., Tessens B., Gobert S., Revis N. & Artois T.J. 2017. On the genus Gallorhynchus Schockaert & Brunet, 1971 (Platyhelminthes, Kalyptorhynchia, Polycystididae) with the description of four new species. Zootaxa 4227: 61–74.

Schockaert E.R., Moons P., Janssen T., Tessens B.S., Reygel P.C., Revis N., Jouk P.E.H., Willems W.R. & Artois T.J. 2019. On the genus Typhlopolycystis Karling, 1956 (Platyhelminthes, Kalyptorhynchia, Polycystididae), with data on the five known species and the description of eleven new species. Zootaxa 4603: 81–104.

Tessens B., Janssen T. & Artois T. 2014. Molecular phylogeny of Kalyptorhynchia (Rhabdocoela, Platyhelminthes) inferred from ribosomal sequence data. Zoologica Scripta 43: 519–530.

Tyler S., Artois T., Schilling S., Hooge M. & Bush L.F. (eds) 2006–2019a. World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Proschizorhynchus Meixner, 1928. Available from [accessed 21 Aug. 2019].

Tyler S., Artois T., Schilling S., Hooge M. & Bush L.F. (eds) 2006–2019b. World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora, Dalytyphloplanida. Available from [accessed 21 Aug. 2019].

Van Steenkiste N., Tessens B., Krznaric K. & Artois T. 2011. Dalytyphloplanida (Platyhelminthes: Rhabdocoela) from Andalusia, Spain, with the description of four new species. Zootaxa 2791: 1–29.

Whitson A., Smith III J.P.S. & Litvaitis M.K. 2011. Lehardyia alleithoros, sp. nov. (Turbellaria, Kalyptorhynchia) from the coast of North Carolina, USA. Southeastern Naturalist 10: 221–232.

Willems W.R., Wallberg A., Jondelius U., Littlewood D.T.J., Backeljau T., Schockaert E.R. & Artois T.J. 2006. Filling a gap in the phylogeny of flatworms: relationships within the Rhabdocoela (Platyhelminthes), inferred from 18S ribosomal DNA sequences. Zoologica Scripta 35: 1–17.


  • There are currently no refbacks.

License URL: