New records of red seaweeds to the coast of Ceará State, northeastern Brazil

Abstract

-(New records of red seaweeds to the coast of Ceará State, Northeastern Brazil). A recent fl oristic survey of Rhodophyta from Ceará State,, revealed the occurrence of 113 species distributed into 14 orders, 28 families and 63 genera. Of these, 18 species belonging to seven orders are new records; some of them poorly described and illustrated in the literature or cited only checklists. Therefore, aiming to expand the taxonomic knowledge about these poorly known species, we present detailed descriptions, illustrations, and comments on related taxa. The occurrence of Ceratodictyon scoparium is confi rmed for the South Atlantic coast. The male gametophytes of Dohrniella antillarum var. brasiliensis and tetrasporophytes of Gracilariopsis silvana are illustrated for the fi rst time. Ceramium fujianum is a new addition to northeastern Brazil. Among the new records, Callithamnion corymbosum, Ceramium clarionense, C. fujianum and C. scoparium showed a signifi cant expansion of their geographic distribution along the Brazilian coast. Most of the newly recorded species are fi lamentous, small-sized or tufted algae, highlighting the need for new collections to detect the presence of these components. Keywords: biodiversity, Rhodophyta, seaweeds, taxonomy RESUMO -(Novos registros de algas marinhas vermelhas na costa do Estado do Ceará, Nordeste do Brasil). Um recente levantamento fl orístico de Rhodophyta do Estado do Ceará (02º46'30''-07º52'15''S, 37º14'54''-41º24'45''W), Brasil, revelou a ocorrência de 113 espécies distribuídas em 14 ordens, 28 famílias e 63 gêneros. Dentre esses, 18 espécies pertencentes a sete ordens são novos registros, algumas pobremente descritas e ilustradas na literatura ou somente citadas em listas. Com o objetivo de expandir o conhecimento taxonômico acerca dessas espécies, são apresentadas descrições detalhadas, ilustrações e comparações com táxons relacionados. A ocorrência de Ceratodictyon scoparium é confi rmada na costa do Atlântico Sul. Os gametófi tos masculinos de Dohrniella antillarum var. brasiliensis e tetrasporófi tos de Gracilariopsis silvana são ilustrados pela primeira vez. Ceramium fujianum é um novo registro para a costa nordeste do Brasil. Dentre as novas ocorrências, Callithamnion corymbosum, Ceramium clarionense, C. fujianum and C. scoparium mostraram uma expansão signifi cativa da distribuição geográfi ca ao longo do litoral brasileiro. A maioria das espécies é fi lamentosa, diminutas ou formam tufos, demonstrando a necessidade de novas coletas para detectar a presença desses componentes.

A new flattened species of Gracilariopsis (Gracilariales, Rhodophyta) from Japan

“…Gracilariopsis mageshimensis is the second Gracilariopsis species with a flattened thallus. Gracilariopsis silvana, the first flattened species, is recorded from Venezuela and Brazil and characterized by flattened thalli, that are sometimes slightly undulated and subdichotomously or irregularly branched, with branches decreasing in width distally, lateral branches arising mostly from the thallus margin, a medulla consisting of 5-6(9) layers, and a constriction at the base of the cystocarp (Gurgel et al 2003a;Soares et al 2018). Gracilariopsis mageshimensis is distinguished from Gp.…”

“…mageshimensis. Gurgel et al (2003a) and Soares et al (2018) collected Gp. silvana specimens by hand in the shallow subtidal zone, or in tidal pools, whereas Gp.…”

“…Since its description, Gp. silvana has been reported from Brazil (Soares et al 2018). Gracilariopsis silvana seems to be confined to the tropical Western Atlantic Ocean.…”