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Abstract
A new heteronemertean, Baseodiscus jonasii sp. nov., is described from Guadalcanal, Solomon Islands. It resembles B. delineatus in inner morphology but can be distinguished from this species by its different colour pattern and differences in the nucleotide sequence of the mitochondrial 16S rRNA gene. The monophyletic status of the genus is investigated by reconstructing the phylogeny of six specimens from four species assigned to this genus, together with 22 specimens from nine other heteronemertean genera, using parsimony and Bayesian analysis. The results imply that Baseodiscus is a monophyletic group while several other heteronemertean genera are non‐monophyletic.
Acknowledgements
Funding for this research was provided by Helge Ax:son Johnsons stiftelse (MS & AH). It was also financially supported by the Swedish Research Council and the Erna and Victor Hasselblad Foundation (P.S.). We are grateful to Len Rodwell and Andrew Richards for their support during P.S. 's stay in Honiara, and to Jonas Sundberg for assistance in the field. We also thank Professor Ray Gibson for helpful comments on the manuscript.