Molecular systematics ofCrassiphycusandHydropuntia(Gracilariales, Rhodophyta) with the description of poorly known taxa in the Western Atlantic Ocean

Autor(es)

Gurgel, Carlos Frederico D. ; Soares, Luanda P. ; Norris, James N. ; Fujii, Mutue T. ; Schmidt, William E. ; Fredericq, Suzanne

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Phycology; v. 56, n. 2, p. 14-pg., 2020-10-17.

Resumo

This study builds on recent treatments of the marine red algal family Gracilariaceae (Gracilariales) focusing in detail onHydropuntiaandCrassiphycus. Species in these two genera often present identification problems due to high levels of morphologial similarity among genetically distinct species, and high levels of phenotypic plasticity, leading to pseudo-cryptic speciation and homoplasies. In order to resolve long standing problems, clarify some species concepts and better understand the evolution of the group, we performed phylogenetic analyses of all plastidrbcL DNA sequences available for knownHydropuntiaandCrassiphycusspecies, including newly sequenced specimens. Our results revealed the presence of potentially undescribed species, the existence of strong phylogeographic patterns below and above the species level and helped re-delineate morphologically similar taxa. New detailed morphological descriptions for three common yet poorly known Western Atlantic species are provided:C. secundus, C. usneoidesandH. rangiferina. H. rangiferinafrom the Indo-Pacific is a distinct species from the trueH. rangiferinaand represents a putative undescribed species. We also provide a time-calibrated phylogeny for the six genera in the Gracilariales to identify past geological and climatic processes associated with their origin and diversification. (AU)

• Processo FAPESP: 16/50370-7 - Resgate histórico dos holótipos das macroalgas da costa brasileira e etiqueta molecular dos topótipos
• Beneficiário: Mutue Toyota Fujii
• Modalidade de apoio: Auxílio à Pesquisa - Regular