Taxonomic revision of the Peyssonneliales (Rhodophyta): Circumscribing the authentic Peyssonnelia clade and proposing four new genera and seven new species

Journal of Phycology - Tập 57 Số 6 - Trang 1749-1767 - 2021
Edilene Maria dos Santos Pestana1,2, José Marcos de Castro Nunes1, Valéria Cassano3, Goia de Mattos Lyra4
1Laboratorio de Algas Marinhas (LAMAR) Instituto de Biologia Universidade Federal da Bahia Rua Barão de Jeremoabo Salvador Bahia 40170115 Brazil
2Programa de Pós‐Graduação em Botânica (PPGBot) Departamento de Ciências Biológicas Universidade Estadual de Feira de Santana Feira de Santana Bahia 44036900 Brazil
3Departamento de Botânica, Instituto de Biociências Universidade de São Paulo São Paulo 05508090 Brazil
4Programa de Pós‐Graduação em Biodiversidade e Evolução (PPGBioEvo) Instituto de Biologia Universidade Federal da Bahia Rua Barão de Jeremoabo Salvador Bahia 40170115 Brazil

Tóm tắt

The Peyssonneliaceae represents the only family in the order Peyssonneliales, a clade of red encrusting algae distributed worldwide, including 136 species in eleven currently accepted genera. Delineation of genera in the Peyssonneliaceae has mostly been based on vegetative characteristics. Previous molecular phylogenies have shown that some traditionally circumscribed genera are not monophyletic and relationships among them are uncertain. We contribute to the knowledge of the evolutionary history of this clade, presenting a robust rbcL phylogeny that provides new insights on the origin and diversification of the Peyssonneliales. Based on a broad dataset and morphological analyses, we propose a revised taxonomic scheme for the Peyssonneliales resolved as monophyletic with well‐supported main lineages. Our results show that Peyssonnelia is polyphyletic, and, therefore, we propose three new genera, Agissea, Olokunia, and Rhodowynnea to accommodate species currently assigned to Peyssonnelia, but distantly related to the clade with the type species of the genus. Additionally, barcoding techniques and analyzed criteria for specific delimitation supported the establishment of one new genus, Brasilophycus, and seven new species, from northeastern Brazil: Agissea amadoi, A. densissima, A. taberniforma, A. villatlantica, A. yemonjasagbae, Brasilophycus similis, and B. roseomarginatus. Our integrative taxonomic approach reveals underestimated diversity of Brazilian Peyssonneliales. Investment in broader sampling along the Brazilian coast and other tropical areas may reveal that its marine biodiversity can be expanded, enlightening our knowledge about this ecologically important group of red algae.

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