Taxonomic study of two Sargassum species (Fucales, Phaeophyceae) from the Ryukyu Islands, southern Japan: Sargassum ryukyuense sp. nov. and Sargassum pinnatifidum Harvey
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概要
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Species of the genus Sargassum (Fucales, Phaeophyceae)belonging to the Schizophycus group (in subgenusSargassum sensu lato) from the Ryukyu Islands, southernJapan, were morphologically reinvestigated, and twoentities were recognized: Sargassum ryukyuense sp. nov.and Sargassum pinnatifidum. The new species is characterizedby: 1) compressed primary branches; 2) simplelanceolate primary and lateral leaves with an undulateand dentate margin in all stages; 3) lateral branches issuingalternate-distichously on the main branches in one plane; 4) long and flattened receptacles arranged alternate-distichously on terminal branches; 5) main and lateralbranches on the stem issuing as foliar expansions inthe early stage of development; and 6) vesicles with asimple coronal leaf. This new species resembles S. pinnatifidumin features 1), 3) and 5). However, it differs fromS. pinnatifidum in features 2), 4) and 6). Furthermore, thisnew species can be distinguished from all previouslydescribed species based on the complete set of diagnosticfeatures above and by the presence of long lingulatereceptacles with short stalks. The new species is known to be endemic in the Ryukyu Islands and adjacentwaters of southern Japan.
- Walter de Gruyterの論文
- 2008-02-05
Walter de Gruyter | 論文
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