Gelidium guimaraesiae sp. nov. (Gelidiaceae, Rhodophyta) from the Western Atlantic segregated from G. floridanum by morphological and molecular evidence

Abstract

The Gelidium species are susceptible to a great phenotypic plasticity. In this genus, studies integrating morphological and molecular data have been increasingly used to define species. To date nine Gelidium species are reported along the Brazilian coast. Gelidium floridanum is the most frequently recorded species in Brazilian but it is also often confused with morphologically similar species, especially in the field or when reproductive structures are absent. In this study we analyzed specimens from Brazil previously identified as G. floridanum based on the morphological and molecular data (cox1 and rbcL DNA sequences). Newly collected specimens from Brazil showed a DNA sequence divergence from G. floridanum in the order of 1.0–1.4% for rbcL and 4.2% for cox1, enough to be considered a new species, here described as Gelidium guimaraesiae sp. nov.

Confirmación taxonómica de Gelidium americanum (Gelidiaceae, Rhodophyta) en Tabasco, México, usando un enfoque morfológico y molecular

“…Los valores de divergencias de nucleótidos para ambos marcadores a nivel intra e interespecífico coinciden con los indicados previamente en Gelidiales y otras algas rojas (Boo et al, 2016a, b;Jamas et al, 2017;Boo y Hughey, 2019;Brunelli et al, 2019a, b;Perrone et al, 2019;Boo y Kim, 2020;Quiroz-González et al, 2020).…”

“…El empleo de marcadores moleculares, principalmente de plástidos y mitocondrias (rbcL, COI-5P), ha clarificado la situación taxonómica de algas del orden Gelidiales (p. ej., Boo et al, 2016a, b;Jamas et al, 2017;Boo y Hughey, 2019;Brunelli et al, 2019a, b;Perrone et al, 2019;Boo y Kim, 2020;Quiroz-González et al, 2020). Sin embargo, estos marcadores no han sido aplicados a especies mexicanas, con excepción de lo recientemente publicado por Quiroz-González et al (2020) para las costas del Pacífico tropical mexicano.…”

<italic>Alsidium oliveiranum</italic> sp. nov. (Rhodomelaceae, Rhodophyta), an overlooked species from the southwestern Atlantic based on morphology and DNA sequence data

“…This result is unsurprising, as this region hosts a particularly high algal species diversity, including rare and endemic species (De Oliveira Filho 1969, Guimarães and Fujii 1998, Chen et al 2019. Moreover, its seaweed diversity is continuously growing as the use of molecular assisted identification is contributing to the discovery of new species (Nauer et al 2015, Iha et al 2016, Ximenes et al 2017, Brunelli et al 2019a, 2019b. The high diversity in this peculiar coast has been attributed to the substrate heterogeneity and availability, as well as the particular seawater temperature conditions because this region is a transition zone between tropical and subtropical regions and it is affected by upwelling events (Guimarães 2003).…”