Meridionella gen. nov., a New Genus of Cystocloniaceae (Gigartinales, Rhodophyta) from the Southern Hemisphere, Including M. obtusangula comb. nov. and M. antarctica sp. nov.

Journal of Phycology - Tập 57 Số 3 - Trang 797-816 - 2021
Gina A. Tonicelli1,2, M. Emilia Croce1,2, Pilar Díaz‐Tapia3,4, Suzanne Fredericq5, D. Wilson Freshwater6, M. Cecilia Gauna1,2, Elisa R. Parodi1,2, Heroen Verbruggen7, Max H. Hommersand8
1Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, San Juan 670, Bahía Blanca 8000, Argentina
2Instituto Argentino de Oceanografía CONICET–UNS Camino La carrindanga km 7.5 Bahía Blanca 8000 Argentina
3Coastal Biology Research Group, Faculty of Sciences and Centre for Advanced Scientific Research (CICA), University of A Coruña, 15071 A Coruña, Spain
4Instituto Español de Oceanografía (IEO) Centro Oceanográfico de A Coruña Apdo, 130 15080 A Coruña Spain
5Department of Biology, University of Louisiana at Lafayette, Lafayette, Louisiana, 70504-3602 USA
6Center for Marine Science, University of North Carolina at Wilmington, 5600 Marvin Moss Lane, Wilmington, North Carolina, 28409 USA
7School of BioSciences, University of Melbourne, Melbourne, Victoria 3010, Australia
8Department of Biology, University of North Carolina at Chapel Hill, Coker Hall, Chapel Hill, North Carolina, 27599-3280 USA

Tóm tắt

The classification of Cystoclonium obtusangulum has been questioned since the species was first described by Hooker and Harvey as Gracilaria? obtusangula. The objective of this study was to provide the first comprehensive taxonomic analysis of Cystoclonium obtusangulum, based on DNA sequences coupled with morphological observations made on syntype specimens and new collections. Sequence divergences of rbcL, UPA, and COI‐5P, and maximum‐likelihood phylogenies for rbcL and 18S demonstrated that specimens identified as Cystoclonium obtusangulum represent a clade of two distinct species that are distantly related to the generitype Cystoclonium purpureum. A new genus, Meridionella gen. nov., is proposed for this clade. The two species placed in this new genus were morphologically indistinguishable cryptic species, but have disjunct distributions, with Meridionella obtusangula comb. nov. found from temperate to cold coasts of South America and the Falkland Islands and Meridionella antarctica sp. nov., occurring in Antarctic waters. Vegetative and reproductive characters of Meridionella gen. nov. are described, and implications of our results for the biogeography of the family Cystocloniaceae are discussed.

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Journal of Phycology

Tập 57 Số 3

797-816

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