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THE RECLASSIFICATION OF LESSONIA LAMINARIOIDES (LAMINARIALES, PHAEOPHYCEAE): PSEUDOLESSONIA GEN. NOV. 1
Author(s) -
Cho Ga Youn,
Klochkova Nina G.,
Krupnova Tatya.,
Boo Sung Min
Publication year - 2006
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2006.00280.x
Subject(s) - kelp , biology , clade , macrocystis pyrifera , pacific ocean , taxon , botany , oceanography , gene , phylogenetics , geology , genetics
A new genus, Pseudolessonia , is proposed for the kelp Lessonia laminarioides Postels et Ruprecht (Laminariales, Phaeophyceae), which occurs on the northwest side of the Sea of Okhotsk, in the northwest Pacific Ocean. Pseudolessonia is monotypic and differs from Lessonia in its short primary stipes and its corrugated, unilaterally arranged blades with entire margins. This species is transferred on the basis of morphology and plastid gene sequence comparisons. We determined psa A and rbc L gene sequences from 17 taxa of Pseudolessonia , Lessonia , and putative relatives. Analyses of individual and combined data sets resulted in congruent trees showing a clear separation of Pseudolessonia laminarioides from Lessonia , but suggesting its sister relationships with the clade of Nereocystis , Macrocystis , Pelagophycus , and Postelsia in the North Pacific Ocean. On the other hand, Lessonia species from the South Pacific Ocean formed a strongly supported clade. The results indicate that the basal splitting of the blade, which has been considered a diagnostic character for the family Lessoniaceae, is a result of convergent evolution.