Morphology and reproduction of Mesophyllum erubescens (Foslie) Me. Lemoine (Corallinales, Rhodophyta) from Southern Brazil

Abstract

-(morphology and reproduction of Mesophyllum erubescens (Foslie) me. lemoine (corallinales, Rhodophyta) from southern Brazil). the genus Mesophyllum me. lemoine includes around 147 species, of which only three have been referred to the Brazilian coast. Mesophyllum erubescens was originally described from Fernando de noronha archipelago, Brazil (type locality). Here we present the first detailed description of M. erubescens based on Brazilian material. samplings were made through scuba diving at the Biological marine Reserve of arvoredo island, santa catarina. the relations of M. erubescens with other similar species, especially from the american atlantic studied by W.R. taylor are discussed.Key-words -arvoredo island, mäerl, rhodolith bed, seaweed taxonomy RESUMO -(morfologia e reprodução de Mesophyllum erubescens (Foslie) me. lemoine (corallinales, Rhodophyta) do sul do Brasil). o gênero Mesophyllum me. lemoine compreende cerca de 147 espécies, das quais apenas três são referidas para a costa brasileira. Mesophyllum erubescens foi originalmente descrita para o arquipélago de Fernando de noronha, Brasil (localidade tipo). neste trabalho é apresentada a primeira descrição detalhada de M. erubescens baseada em material brasileiro. as amostragens foram realizadas através de mergulho autônomo na Reserva Biológica marinha do arvoredo, santa catarina. as relações de M. erubescens com outras espécies semelhantes são discutidas, sendo especialmente consideradas espécies do atlântico americano estudadas por W.R. taylor.Palavras-chave -banco de rodolitos, ilha do arvoredo, mäerl, taxonomia de macroalgas

Taxonomic study of crustose coralline algae off the northeastern Brazilian coast

“…The genus Mesophyllum has been described by many authors, among them , Keats & Chamberlain (1994), Keats & Maneveldt (1997), Athanasiadis et al (2004), and Horta et al (2011). The diagnostic features of the genus include a thallus with a monomerous construction, the coaxial cells of hypothallial filaments, the cells of adjacent filaments joined by cell fusion, epithallial cells rounded or flattened, subepithallial initials as long as or longer than the cells immediately subtending them, multiporate tetrasporangial conceptacles, unbranched mother cells of spermatangia, occurring both in the roof and in the floor of the conceptacle, and a dumbbell-shaped chamber of the carposporangial conceptacle.…”

“…The diagnostic features of the genus include a thallus with a monomerous construction, the coaxial cells of hypothallial filaments, the cells of adjacent filaments joined by cell fusion, epithallial cells rounded or flattened, subepithallial initials as long as or longer than the cells immediately subtending them, multiporate tetrasporangial conceptacles, unbranched mother cells of spermatangia, occurring both in the roof and in the floor of the conceptacle, and a dumbbell-shaped chamber of the carposporangial conceptacle. In Brazil, only two species of Mesophyllum have been reported: M. erubescens and M. engelhartii (Foslie) W. H. Adey (1970: 23) (Foslie 1900b, Figueiredo & Steneck 2002, Figueiredo et al 2007, Nunes et al 2008, Burgos 2011, Horta et al 2011, Amado Filho et al 2012a, which differ principally by the size and shape of the cells lining the pore canals of the tetrasporangial conceptacles. According to Keats & Chamberlain (1994), Ringeltaube & Harvey (2000), and Horta et al (2011), the following characteristics are used for their identification: tetrasporangial conceptacle location and size, the shape of the cells that line the pore canals of the tetrasporangial conceptacles, and the number of cells that form the roof of the conceptacle.…”

“…To date, 41 valid species have been recorded for the Brazilian coast (Horta 2002, Figueiredo & Steneck 2002, Tâmega & Figueiredo 2005, AmadoFilho et al 2007, Nunes et al 2008, Villas-Boas et al 2009, Farias et al 2010, Henriques et al 2011, Horta et al 2011, Pereira-Filho et al 2011, Amado-Filho et al 2012a, b, Mariath et al 2012, Bahia et al 2013, Mariath et al 2013. A few studies in the state of Bahia have investigated the taxonomy and ecology of CCA and most of them were accomplished in the southern limit of this region (Figueiredo & Steneck 2002, Nunes et al 2008, Amado-Filho et al 2012b, Mariath et al 2012and Bahia et al 2013.…”

Lithothamnion steneckii sp. nov. and Pneophyllum conicum: new coralline red algae (Corallinales, Rhodophyta) for coral reefs of Brazil

“…shown that Brazilian coralline flora is more diverse than was previously considered (e.g., Villas-Boas et al 2009, Da Nóbrega Farias et al 2010, Bahia et al 2011, Horta et al 2011, Henriques et al 2012). Furthermore, most ecological studies were not carried out using rigorous taxonomic evaluation.…”

Lithophyllum species from Brazilian coast: range extension of Lithophyllum margaritae and description of Lithophyllum atlanticum sp. nov. (Corallinales, Corallinophycidae, Rhodophyta)

“…According to Woelkerling & Campbell (1992), Lithophyllum also does not produce haustoria, and does not have a thallus composed of flattened branches with an isobilateral internal organization. Lithophyllum species are distributed worldwide in all oceans (Guiry & Guiry 2014); nevertheless, the taxonomical knowledge of this group in the subtropical western Atlantic coast is still scarce (Horta et al 2011). Taylor (1960) first reported Lithophyllum pointing out the occurrence of L. pustulatum (Lamouroux) Foslie (1904:8) on the rocky shores of the southeastern Brazilian coast.…”