Kapraunia silviae (Rhodomelaceae, Rhodophyta), a new species from the South Atlantic Ocean

Author(s)

de Brito, Jhullyrson O. F. ; Cassano, Valeria

• Document type: Journal article
• Source: Botanica Marina; v. 67, n. 4, p. 14-pg., 2024-07-03.

Abstract

Kapraunia is a genus recently segregated from Polysiphonia sensu lato, with only four species so far known. However, no species have been found on the South Atlantic coast. Recent collections in southwestern Brazil revealed specimens morphologically similar to Kapraunia spp. To investigate the identity of these specimens, we carried out a morphological and molecular study based on COI-5P and rbcL sequences. Phylogenetic analysis placed our samples within the genus Kapraunia as a new species with full support, described here as Kapraunia silviae sp. nov. K. silviae is recognizable by a combination of characters such as attachment by a basal disc and a prostrate system, branches developing laterally to the trichoblasts, 5-6 pericentral cells, rarely 4. The species differs from K. pentamera by the attachment form, segment proportions and tetrasporangial dimensions, and from K. schneideri by the number of pericentral cells, branch development and tetrasporangial arrangement. Re-examination of herbarium samples from Brazil in older collections also revealed misidentifications of K. silviae as "Carradoriella denudata". This new species seems to be restricted to the Brazilian coast, being found only on the northern coast of S & atilde;o Paulo state. Our results reinforce the need for revision of Polysiphonia s.l. species on the Brazilian coast. (AU)

• FAPESP's process: 22/12597-0 - Diversification and enhancement of the collections on the hebaria in the State of São Paulo, with increase of their virtual availability and spatial analysis, for advances in documentation of the Neotropical biodiversity
• Grantee: José Rubens Pirani
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 21/14076-5 - Taxonomy and Phylogeny of the genus Polysiphonia sensu lato (Ceramiales, Rhodophyta) on the Brazilian coast
• Grantee: Jhullyrson Osman Ferreira de Brito
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 22/13278-6 - Phylogenomics and characterization of organellar genomes of representatives of the Laurencia complex (Rhodomelaceae, Rhodophyta)
• Grantee: Valéria Cassano
• Support Opportunities: Regular Research Grants