Rousseau F. auteur aut IRD Gey D. auteur aut IRD Kurihara A. auteur aut IRD Maggs C. A. auteur aut IRD Martin-Lescanne J. auteur aut IRD Payri Claude auteur aut IRD de Reviers B. auteur aut IRD Sherwood A. R. auteur aut IRD Le Gall L. auteur aut IRD text journalArticle eng text/pdf reformatted digital access The systematics of the Laurencia complex was investigated using a taxon-rich data set including the chloroplast ribulose-1,5-bisphosphate carboxylase/oxygenase large subunit (rbcL) gene only and a character-rich data set combining mitochondrial cytochrome oxidase 1 (COI-5P), the rbcL marker, and the nuclear large subunit of the ribosomal operon (LSU). Bayesian and ML analyses of these data sets showed that three species hitherto placed in the genus Laurencia J.V. Lamour. were not closely related to Laurencia s. str. Laurencia caspica Zinova & Zaberzhinskaya was the sister group of the remaining Osmundea Stackh. species, L. crustiformans McDermid joined Palisada and L. flexilis Setch. consisted of an independent lineage. In light of these results a new genus, Ohelopapa F. Rousseau, Martin-Lescanne, Payri & L. Le Gall gen. nov., is proposed to accommodate L. flexilis. This new genus is morphologically characterized by four pericentral cells in each vegetative axial segment; however, it lacks 'corps en cerise' in cortical cells and secondary pit connections between cortical cells, which are characteristic of Laurencia. Three novel combinations are proposed to render the classification closer to a natural system: Ohelopapa flexilis (Setch.) F. Rousseau, Martin-Lescanne, Payri & L. Le Gall comb. nov., Osmundea caspica (Zinova & Zaberzhinskaya) Maggs & L. M. McIvor comb. nov. and Palisada crustiformans (McDermid) A.R. Sherwood, A. Kurihara & K.W. Nam comb. nov. specialized Laurencia caspica Laurencia crustiformans Laurencia flexilis Ohelopapa Osmundea 034 269 1-19 2017 2118-9773 https://www.documentation.ird.fr/hor/fdi:010069359 10.5852/ejt.2017.269 2118-9773 [F B010069359] https://www.documentation.ird.fr/hor/fdi:010069359 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers17-04/010069359.pdf IRD - Base Horizon / Pleins textes 2017-05-09 2023-07-11 fdi:010069359 fre