Diversity in the genus Yuzurua (Ceramiales, Rhodophyta), with the description of a new species from the Western South Atlantic

Autor(es)

Brunelli, Beatriz ; Soares, Luanda Pereira ; Cassano, Valeria ; Collado-Vides, Ligia ; Fujii, Mutue T.

• Tipo de documento: Artigo Científico
• Fonte: PHYCOLOGIA; v. 64, n. 1, p. 9-pg., 2025-01-02.

Resumo

The rhodomelacean Laurencia complex (Ceramiales, Rhodophyta) encompasses eight genera, including Yuzurua, which is one of the least speciose of the complex, with only two species recognized: Y. iridescens and Y. poiteaui (generitype). During seaweed biodiversity studies on the Brazilian coast, unknown specimens belonging to this Laurencia complex were found in the southern region of Bahia state, which possesses tropical affinities. In this study, we assessed the phylogenetic relationships and taxonomic affinities of these specimens, using morphology and DNA sequence data from rbcL and COI5P. The molecular results placed the specimens as a distinct evolutionary lineage within Yuzurua, genetically distinct from its congeners. This new species, Yuzurua nunesii sp. nov. exhibited the typical vegetative morphological features of the genus, such as two pericentral cells in each vegetative axial segment, secondary pit connections between cortical cells and absence of corps en cerise. This species can be morphologically distinguished from other Yuzurua species by a combination of characters, including their habitat (subtidal for Y. nunesii) and morphoanatomy regarding cortical cell projection, palisade arrangement of outermost cortical cells and presence/absence of iridescence. The occurrence of Yuzurua is confirmed for the first time on the Brazilian coast by molecular data, and its distribution expanded southward in the western Atlantic Ocean. (AU)

• Processo FAPESP: 23/12846-3 - Ecologia e filogenômica das algas marinhas sob o desafio das mudanças climáticas globais: investigação para a conservação
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