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J Phycol. 2008 Jun;44(3):721-38. doi: 10.1111/j.1529-8817.2008.00505.x.

GAYLIELLA GEN. NOV. IN THE TRIBE CERAMIEAE (CERAMIACEAE, RHODOPHYTA) BASED ON MOLECULAR AND MORPHOLOGICAL EVIDENCE(1).

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1
Department of Marine Life Science, Chosun University, Gwangju 501-759, KoreaDepartment of Biology, Chungnam National University, Daejon 305-764, KoreaDepartment of Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3280, USASchool of Biological Sciences, Queen's University, Belfast BT9-7BL 1NN, UKNational Herbarium, Einsteinweg 2, PO Box 7514, 2300 RA, Leiden, the NetherlandsDepartment of Biology, University of Louisiana at Lafayette, Lafayette, Louisiana 70504-2451, USA.

Abstract

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.

KEYWORDS:

Ceramiaceae; Ceramiales; Ceramieae; Ceramium; Gayliella gen. nov.; LSU rDNA; Rhodophyta; morphology; phylogeny; rbcL; systematics; taxonomy

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