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The phylogenetic relationships and taxonomic status of the Gelidialean genera  Onikusa  Akatsuka and  Suhria  J. Agardh  ex  Endlicher were examined based on analyses of molecular and morphological characters. The DNA sequences of  rbcL  from multiple specimens of all  Onikusa  and  Suhria  species were included in analyses of 38 Gelidialean taxa having the  Gelidium -type female reproductive and cystocarp systems. Six well-supported species clades were resolved in these analyses. Two species of  Onikusa  and  Suhria vittata  (Linnaeus) Endlicher were resolved within the ‘ Suhria  clade’, and  Onikusa japonica  (Harvey) Akatsuka was resolved within the ‘ Gelidium chilense  clade.’  Gelidium  Lamouroux was paraphyletic with respect to  Onikusa  and  Suhria . Evidence for a turf-form ecotype of  Onikusa pristoides  was found. Examination of species resolved within the ‘ Suhria ,’ ‘ Gelidium chilense ’ and ‘ G. coulteri clades’ revealed that the medullary structure type was not a synapomorphy for these clades. Based on these new and previous findings, the reversion of  Suhria vittata, Onikusa pristoides  (Turner) Akatsuka, and  Onikusa japonica  to  Gelidium , and the new combinations  Gelidium vittatum  (Linnaeus) Kützing forma  laceratum  (Grunow) D.W. Freshwater and  Gelidium foliaceum  (Okamura) E.M. Tronchin are proposed.

botanica marina

A Reassessment and Reclassification of Species in the Genera Onikusa Akatsuka and Suhria J. Agardh ex Endlicher (Gelidiales, Rhodophyta) Based on Molecular and Morphological Data