Equinoideos y asteroideos de la colección del Instituto Oceanógrafico de la Universidad de San Pablo: segunda contribución

Bernasconi, I

doi:10.1590/s0373-55241956000100008

Cited by 10 publications

(14 citation statements)

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“…The larvae of E. thouarsi (Emlet 1988) and (possibly) E. tribuloides (McPherson 1968) settle in the laboratory 25-30 days after fertilization. The southernmost limit of the range of E. tribuloides extends to Rio de Janeiro (Bernasconi 1955) and the easternmost limit to the Gulf of Guinea (Chesher 1966). The close genetic similarity between E. tribuloides from the Caribbean Sea and Brazil to the Gulf of Guinea indicates that there has been recent gene flow between these areas, despite the fact that the transit time across the tropical Atlantic, estimated from the average velocity of the equatorial undercurrent (Metcalf et al 1962), is 43-70 days (Chesher 1966).…”

Section: Discussion Correspondence Between Ntdna Clades and Biologicamentioning

confidence: 99%

Phylogeography of the Pantropical Sea Urchin Eucidaris in Relation to Land Barriers and Ocean Currents

Lessios¹,

Kessing²,

Robertson³

et al. 1999

Evolution

127

129

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Abstract.-The pantropical sea urchin genus Eucidaris contains four currently recognized species, all of them allopatric: E. metularia in the Indo-West Pacific, E. thouarsi in the eastern Pacific, E. tribuloides in both the western and eastern Atlantic, and E. clavata at the central Atlantic islands of Ascension and St. Helena. We sequenced a 640-bp region of the cytochrome oxidase I (COI) gene of mitochondrial DNA to determine whether this division of the genus into species was confirmed by molecular markers, to ascertain their phylogenetic relations, and to reconstruct the history of possible dispersal and vicariance events that led to present-day patterns of species distribution. We found that E. metularia split first from the rest of the extant species of the genus. If COI divergence is calibrated by the emergence of the Isthmus of Panama, the estimated date of the separation of the Indo-West Pacific species is 4.7-6.4 million years ago. This date suggests that the last available route of genetic contact between the Indo-Pacific and the rest of the tropics was from west to east through the Eastern Pacific Barrier, rather than through the Tethyan Sea or around the southern tip of Africa. The second cladogenic event was the separation of eastern Pacific and Atlantic populations by the Isthmus of Panama. Eucidaris at the outer eastern Pacific islands (Galapagos, Isla del Coco, Clipperton Atoll) belong to a separate clade, so distinct from mainland E. thouarsi as to suggest that this is a different species, for which the name E. galapagensis is revived from the older taxonomic literature. Complete lack of shared alleles in three allozyme loci between island and mainland populations support their separate specific status. Eucidaris galapagensis and E. thouarsi are estimated from their COI divergence to have split at about the same time that E. thouarsi and E. tribuloides were being separated by the Isthmus of Panama. Even though currents could easily convey larvae between the eastern Pacific islands and the American mainland, the two species do not appear to have invaded each other's ranges. Conversely, the central Atlantic E. clavata at St. Helena and Ascension is genetically similar to E. tribuloides from the American and African coasts. Populations on these islands are either genetically connected to the coasts of the Atlantic or have been colonized by extant mitochondrial DNA lineages of Eucidaris within the last 200,000 years. Although it is hard to explain how larvae can cross the entire width of the Atlantic within their competent lifetimes, COI sequences of Eucidaris from the west coast of Africa are very similar to those of E. tribuloides from the Caribbean. FST statistics indicate that gene flow between E. metularia from the Indian Ocean and from the western and central Pacific is restricted. Low gene flow is also evident between populations of E. clavata from Ascension and St. Helena. Rates of intraspecific exchange of genes in E. thouarsi, E. galapagenisis, and E. tribuloides, on the other hand, are hi...

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Section: Discussion Correspondence Between Ntdna Clades and Biologicamentioning

confidence: 99%

Phylogeography of the Pantropical Sea Urchin Eucidaris in Relation to Land Barriers and Ocean Currents

Lessios¹,

Kessing²,

Robertson³

et al. 1999

Evolution

127

129

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“…Paxilas formadas por espineletes paxilares longos e numerosos. Três espinhos ambulacrais, dos quais o interno é um pouco maior que os outros (Bernasconi 1957;Tommasi 1970a;Clark & Downey 1992).…”

Section: Echinodermata Do Embaiamento Sul Brasileirounclassified

“…Distribuição geográfica: Oceano Atlântico: Honduras, Panamá, Suriname (Clark & Downey 1992;Alvarado et al 2008), Brasil (Tommasi 1958(Tommasi , 1970aGondim et al 2014;Alitto et al 2016), Uruguai e Argentina (Bernasconi 1957).…”

Section: Echinodermata Do Embaiamento Sul Brasileirounclassified

Guia ilustrado dos Echinodermata da porção sul do Embaiamento Sul Brasileiro

Bueno

Alitto

Guilherme

et al. 2018

PECEN

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Este guia ilustrado apresenta 57 espécies de Echinodermata Bruguière, 1791 [ex Klein, 1734] registradas na porção sul do Embaiamento Sul Brasileiro (ESB), incluindo o litoral sul do Estado de São Paulo, todo o litoral do Paraná e norte de Santa Catarina. O guia destina-se a pesquisadores e estudantes que atuam ou gostariam de atuar com o grupo e serve de auxílio na identificação em campo e laboratório. Apresentamos uma caracterização do filo Echinodermata, uma breve descrição da área de estudo, técnicas de coleta e preservação dos exemplares. Para cada classe, são apresentadas caracterizações com as principais estruturas morfológicas de importância taxonômica, seguida das diagnoses das espécies registradas na ESB. Dentro de cada classe, as espécies foram organizadas por família e depois alfabeticamente de acordo com o gênero e a espécie. Para cada espécie foram incluídas fotos, diagnoses, distribuição geográfica e hábitat quando disponíveis em literatura. Esse trabalho é o primeiro guia ilustrado de equinodermos no Brasil e complementa de forma consistente o conhecimento da biodiversidade do grupo, gerando subsídios para futuras intervenções, tomadas de decisões e manutenção da diversidade deste incrível grupo de animais marinhos.Palavras chave: Equinodermos, sul do Brasil, diversidade, Sudoeste Atlântico, Taxonomia.

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“…Colour. According to Bernasconi (1957) , live animals have an intense violet colour with the spines of the marginal fringe yellowish or pinkish. Actinal surface light salmon colour.…”

Section: Systematicsmentioning

confidence: 99%

Taxonomic guide and historical review of starfishes in northeastern Brazil (Echinodermata, Asteroidea)

Gondim¹,

Christoffersen²,

Dias

2014

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Presently more than 1900 species of sea stars are recognized, of which 77 are recorded for the coast of Brazil. Although the first starfish record in Brazil was published 363 years ago, our knowledge of this fauna remains unsatisfactory from a systematic and ecological point of view, particularly in the north and northeastern regions of the country. This study provides the first annotated list of sea stars from northeastern Brazil. Material described herein is housed at the collections of the Federal University of Paraíba, Federal University of Sergipe, and the Federal University of Bahia, Museum of Zoology of the University of São Paulo and Museu Nacional do Rio de Janeiro. Twenty-one species were identified, belonging to 12 genera, 10 families, and 5 orders. Descriptions of species are provided. Three new occurrences were recorded for northeast Brazil: Astropecten alligator, Luidia ludwigi scotti, and Mithrodia clavigera. Highest diversities of Asteroidea were encountered for the states of Bahia (n = 14 spp), Paraíba (n = 12 spp) and Pernambuco (n = 9 spp). No species were recorded for the states of Maranhão and Sergipe. Sandy substrates and depths below 10 m were the least sampled areas over the continental shelf. Herein we provide a first panorama on the fauna of Asteroidea occurring in the northeast region of Brazil, hopefully to function as a basic reference for biodiversity studies in this poorly studied area.

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Equinoideos y asteroideos de la colección del Instituto Oceanógrafico de la Universidad de San Pablo: segunda contribución

Cited by 10 publications

References 0 publications

Phylogeography of the Pantropical Sea Urchin Eucidaris in Relation to Land Barriers and Ocean Currents

Phylogeography of the Pantropical Sea Urchin Eucidaris in Relation to Land Barriers and Ocean Currents

Guia ilustrado dos Echinodermata da porção sul do Embaiamento Sul Brasileiro

Taxonomic guide and historical review of starfishes in northeastern Brazil (Echinodermata, Asteroidea)

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