Phylogenomics and taxon-rich phylogenies of new and historical specimens shed light on the systematics of Hypnea (Cystocloniaceae, Rhodophyta)

Author(s)

de Jesus, Priscila Barreto ; Lyra, Goia de Mattos ; Zhang, Hongrui ; Fujii, Mutue Toyota ; Nauer, Fabio ; Nunes, Jose Marcos de Castro ; Davis, Charles C. ; Oliveira, Mariana Cabral

• Document type: Journal article
• Source: Molecular Phylogenetics and Evolution; v. 183, p. 13-pg., 2023-03-27.

Abstract

Cystocloniacae is a highly diverse family of Rhodophyta, including species of ecological and economic impor-tance, whose phylogeny remains largely unresolved. Species delimitation is unclear, particularly in the most speciose genus, Hypnea, and cryptic diversity has been revealed by recent molecular assessments, especially in the tropics. Here, we carried out the first phylogenomic investigation of Cystocloniaceae, focused on the genus Hypnea, inferred from chloroplast and mitochondrial genomes including taxa sampled from new and historical collections. In this work, molecular synapomorphies (gene losses, InDels and gene inversions) were identified to better characterize clades in our congruent organellar phylogenies. We also present taxon-rich phylogenies based on plastid and mitochondrial markers. Molecular and morphological comparisons of historic collections with contemporary specimens revealed the need for taxonomic updates in Hypnea, the synonymization of H. marchantiae to a later heterotypic synonym of H. cervicornis and the description of three new species: H. davisiana sp. nov., H. djamilae sp. nov. and H. evaristoae sp. nov. (AU)

• FAPESP's process: 13/11833-3 - Diversity and phylogeny of red algae (Rhodophyta) of economic and ecological importance
• Grantee: Mariana Cabral de Oliveira
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants