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Abstract
Two new species of Sphaerodoropsis Hartman & Fauchald, 1971 (Polychaeta: Sphaerodoridae), collected during the BIOICE programme on sedimentary bottoms off Iceland, are described. Sphaerodoropsis gudmunduri sp. nov. is a shelf species (<400 m) chiefly characterized by having one transverse row of up to 10–12 dorsal macrotubercles per chaetiger (‘Sphaerodoropsis group 2’) and body papillae present only on the prostomium, peristomium, parapodia and ventral surface. It also has up to 7–9 ventral papillae per chaetiger arranged following a non-random pattern and parapodia which bear one digitiform prechaetal lobe, 1–4 papillae and compound unidentate chaetae with blades with thin spinulation along their cutting edge. Sphaerodoropsis halldori sp. nov. has been found in deeper waters (>1000 m) and may be distinguished mostly by having up to 13 dorsal macrotubercles arranged in two transverse rows (6–7 macrotubercles, respectively) defining a zig-zag pattern (‘group 3’) and 7 dorsal papillae per chaetiger, up to 8–10 ventral papillae per chaetiger arranged in a non-random pattern and parapodia which bear one digitiform prechaetal lobe, one antero-lateral papilla and compound unidentate chaetae with blades with thin spinulation along their cutting edge. Both species show sexual dimorphism characterized by different arrangements of modified ventral cirri and/or special ventral structures in some mid-body chaetigers; a brief discussion about the presence of these structures on sphaerodorids and their possible importance on the systematics of the family is provided.
Published in collaboration with the University of Bergen and the Institute of Marine Research, Norway, and the Marine Biological Laboratory, University of Copenhagen, Denmark
Published in collaboration with the University of Bergen and the Institute of Marine Research, Norway, and the Marine Biological Laboratory, University of Copenhagen, Denmark
Acknowledgements
The authors are grateful to Solrun Bragadóttir and all the women of the SMC involved in sorting of specimens from the BIOICE samples, Gudmundur V. Helgason and Halldór P. Halldórsson for their assistance during our stays at the SMC, Gudmundur Gudmundsson (Icelandic Institute of Natural History) for making available to us the material described in this paper, Ada Castro and Catalina Sueiro (SAIN, UDC) for assisting in the preparation of specimens and use of the SEM, Noela Sánchez (UDC) for preparing the maps, Yolanda Lucas (EBMG-USC) for assistance with the line drawings, and Julia García-Carracedo for translating some bibliographic references and correcting the English version of the manuscript. Two anonymous reviewers and Danny Eibye-Jacobsen provided constructive comments which contributed to improving the final version of the manuscript.
Notes
Published in collaboration with the University of Bergen and the Institute of Marine Research, Norway, and the Marine Biological Laboratory, University of Copenhagen, Denmark