Species‐delimitation and phylogenetic analyses of some cosmopolitan species of Hypnea (Rhodophyta) reveal synonyms and misapplied names to H. cervicornis, including a new species from Brazil

Journal of Phycology - Tập 52 Số 5 - Trang 774-792 - 2016
Priscila Barreto de Jesus1,2, Fábio Nauer3, Goia de Mattos Lyra4, Valéria Cassano3, Mariana C. Oliveira3, José Marcos de Castro Nunes1, Alessandra Selbach Schnadelbach5
1Laboratório de Algas Marinhas Instituto de Biologia Universidade Federal da Bahia Rua Barão de Jeremoabo, s/n Salvador Bahia 40.170‐115 Brazil
2Programa de Pós‐Graduação em Botânica Universidade Estadual de Feira de Santana Av. Transnordestina, s/n Feira de Santana Bahia 44031‐460 Brazil
3Departamento de Botânica Instituto de Biociências Universidade de São Paulo Rua do Matão 277 São Paulo São Paulo 05508‐090 Brazil
4Department of Organismic and Evolutionary Biology, Harvard University Herbaria, 22 Divinity Avenue, Cambridge Massachusetts 02138, USA
5Laboratório de Genética e Evolução de Plantas Instituto de Biologia Universidade Federal da Bahia Rua Barão de Jeremoabo, s/n Salvador Bahia 40.170‐115 Brazil

Tóm tắt

Hypnea has an intricate nomenclatural history due to a wide pantropical distribution and considerable morphological variation. Recent molecular studies have provided further clarification on the systematics of the genus; however, species of uncertain affinities remain due to flawed taxonomic identification. Detailed analyses coupled with literature review indicated a strong relationship among H. aspera, H. cervicornis, H. flexicaulis, and H. tenuis, suggesting a need for further taxonomic studies. Here, we analyzed sequences from two molecular markers (COI‐5P and rbcL) and performed several DNA‐based delimitation methods (mBGD, ABGD, SPN, PTP and GMYC). These molecular approaches were contrasted with morphological and phylogenetic evidence from type specimens and/or topotype collections of related species under a conservative approach. Our results demonstrate that H. aspera and H. flexicaulis represent heterotypic synonyms of H. cervicornis and indicate the existence of a misidentified Hypnea species, widely distributed on the Brazilian coast, described here as a new species: H. brasiliensis. Finally, inconsistencies observed among our results based on six different species delimitation methods evidence the need for adequate sampling and marker choice for different methods.

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Journal of Phycology

Tập 52 Số 5

774-792

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