Specimens of Syndesmis aethopharynx Westervelt & Kozloff, 1990 (Umagillidae, Rhabdocoela, Platyhelminthes) were collected from the intestine of several specimens of the sea urchin Paracentrotus lividus (Lamarck, 1816) [2], Hansson, 2001 at the Greek coast. This represents the first report of a species of Syndesmis from Greece. Our study has revealed several previously-unreported morphological details and intraspecific variation, which are added to the species description. The position of S. aethopharynx within Umagillidae is confirmed for the first time through molecular data (based on nuclear 18S rDNA), using both Bayesian and maximum likelihood analyses.

Hasselt University Centre for Environmental Sciences Research Group Zoology Biodiversity and Toxicology Agoralaan Gebouw D B 3590 Diepenbeek Belgium

Hasselt University Centre for Environmental Sciences Research Group Zoology Biodiversity and Toxicology Agoralaan Gebouw D B 3590 Diepenbeek Belgium; Hellenic Centre for Marine Research Institute of Marine Biological Resources and Inland Waters 46 7 km Athinon Souniou Av P O Box 712 Anavyssos 190 13 Greece; Royal Belgian Institute of Natural Sciences Operational Directorate Natural Environment Capacities for Biodiversity and Sustainable Development Vautierstraat 29 B 1000 Brussels Belgium; University of Leuven Department of Biology Laboratory of Biodiversity and Evolutionary Genomics Charles Deberiotstraat 32 B 3000 Leuven Belgium; Masaryk University Faculty of Science Department of Botany and Zoology Kotlářská 2 611 37 Brno Czech Republic

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Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand