GAYLIELLA GEN. NOV. IN THE TRIBE CERAMIEAE (CERAMIACEAE, RHODOPHYTA) BASED ON MOLECULAR AND MORPHOLOGICAL EVIDENCE1

On the basis of comparative morphology and phylogenetic analyses of rbcL and LSU rDNA sequence data, a new genus, Gayliella gen. nov., is proposed to accommodate the Ceramium flaccidum complex (C. flaccidum, C. byssoideum, C. gracillimum var. byssoideum, and C. taylorii), C. fimbriatum, and a previo...

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Bibliographic Details
Published in:Journal of phycology 2008-06, Vol.44 (3), p.721-738
Main Authors: Cho, Tae Oh, Boo, Sung Min, Hommersand, Max H., Maggs, Christine A., McIvor, Lynne, Fredericq, Suzanne
Format: Article
Language:English
Subjects:
Ceramiaceae
Ceramiales
Ceramieae
Ceramium
Gayliella gen. nov
LSU rDNA
morphology
phylogeny
rbcL
Rhodophyta
systematics
taxonomy
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Summary:On the basis of comparative morphology and phylogenetic analyses of rbcL and LSU rDNA sequence data, a new genus, Gayliella gen. nov., is proposed to accommodate the Ceramium flaccidum complex (C. flaccidum, C. byssoideum, C. gracillimum var. byssoideum, and C. taylorii), C. fimbriatum, and a previously undescribed species from Australia. C. transversale is reinstated and recognized as a distinct species. Through this study, G. flaccida (Kützing) comb. nov., G. transversalis (Collins et Hervey) comb. nov., G. fimbriata (Setchell et N. L. Gardner) comb. nov., G. taylorii comb. nov., G. mazoyerae sp. nov., and G. womersleyi sp. nov. are based on detailed comparative morphology. The species referred to as C. flaccidum and C. dawsonii from Brazil also belong to the new genus. Comparison of Gayliella with Ceramium shows that it differs from the latter by having an alternate branching pattern; three cortical initials per periaxial cell, of which the third is directed basipetally and divides horizontally; and unicellular rhizoids produced from periaxial cells. Our phylogenetic analyses of rbcL and LSU rDNA gene sequence data confirm that Gayliella gen. nov. represents a monophyletic clade distinct from most Ceramium species including the type species, C. virgatum. We also transfer C. recticorticum to the new genus Gayliella.
ISSN:0022-3646
1529-8817
DOI:10.1111/j.1529-8817.2008.00505.x