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The taxonomic position of the pelagic `staurozoan` Tessera gemmaria as a ceriantharian larva

RODRIGUEZ, Carolina S.; MARQUES, Antonio C.; STAMPAR, Sergio N.; MORANDINI, Andre C.; CHRISTIANSEN, Ernesto; GENZANO, Gabriel N.; MIANZAN, Hermes W.
Fonte: MAGNOLIA PRESS Publicador: MAGNOLIA PRESS
Tipo: Artigo de Revista Científica
ENG
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Based on 16 specimens from the Southwestern Atlantic coast (Argentina and Brazil) we reinterpret the taxonomic position of Tessera gemmaria Goy, 1979, a stauromedusa considered as incertae sedis for a long time. Using external morphology, histological preparations and molecular data (16S and COI) we conclude that T. gemmaria is an early stage of a cerinula, the long-lived planktonic larval stage of the Ceriantharia (Anthozoa).; Alexander von Humboldt Foundation (AvH); Alexander von Humboldt Foundation; EXA[546/11]; EXA; PICT; PICT[1553]; FAPESP[2004/09961-4]; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); CNPq[557333/2005-9]; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); CNPq[490348/2006-8]; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); CNPq[305735/2006-3]; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); CNPq[474672/2007-7]; CNPq[481399/2007-0]; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); CNPq[563106/2010-7]; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); CNPq[562143/2010-6]; CNPq[564945/2010-2]; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); CAPES; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); CONICET; Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina (CONICET)

Evolutionary Diversification of Banded Tube-Dwelling Anemones (Cnidaria; Ceriantharia; Isarachnanthus) in the Atlantic Ocean

Stampar, Sergio N.; Maronna, Maximiliano M.; Vermeij, Mark J. A.; Silveira, Fabio L. D.; Morandini, Andre C.
Fonte: PUBLIC LIBRARY SCIENCE; SAN FRANCISCO Publicador: PUBLIC LIBRARY SCIENCE; SAN FRANCISCO
Tipo: Artigo de Revista Científica
ENG
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The use of molecular data for species delimitation in Anthozoa is still a very delicate issue. This is probably due to the low genetic variation found among the molecular markers (primarily mitochondrial) commonly used for Anthozoa. Ceriantharia is an anthozoan group that has not been tested for genetic divergence at the species level. Recently, all three Atlantic species described for the genus Isarachnanthus of Atlantic Ocean, were deemed synonyms based on morphological simmilarities of only one species: Isarachnanthus maderensis. Here, we aimed to verify whether genetic relationships (using COI, 16S, ITS1 and ITS2 molecular markers) confirmed morphological affinities among members of Isarachnanthus from different regions across the Atlantic Ocean. Results from four DNA markers were completely congruent and revealed that two different species exist in the Atlantic Ocean. The low identification success and substantial overlap between intra and interspecific COI distances render the Anthozoa unsuitable for DNA barcoding, which is not true for Ceriantharia. In addition, genetic divergence within and between Ceriantharia species is more similar to that found in Medusozoa (Hydrozoa and Scyphozoa) than Anthozoa and Porifera that have divergence rates similar to typical metazoans. The two genetic species could also be separated based on micromorphological characteristics of their cnidomes. Using a specimen of Isarachnanthus bandanensis from Pacific Ocean as an outgroup...

Fast-Evolving Mitochondrial DNA in Ceriantharia: A Reflection of Hexacorallia Paraphyly?

Stampar, Sergio Nascimento; Maronna, Maximiliano Manuel; Kitahara, Marcelo Visentini; Reimer, James; Morandini, André Carrara
Fonte: San Francisco Publicador: San Francisco
Tipo: Artigo de Revista Científica
ENG
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The low evolutionary rate of mitochondrial genes in Anthozoa has challenged their utility for phylogenetic and systematic purposes, especially for DNA barcoding. However, the evolutionary rate of Ceriantharia, one of the most enigmatic ‘‘orders’’ within Anthozoa, has never been specifically examined. In this study, the divergence of mitochondrial DNA of Ceriantharia was compared to members of other Anthozoa and Medusozoa groups. In addition, nuclear markers were used to check the relative phylogenetic position of Ceriantharia in relation to other Cnidaria members. The results demonstrated a pattern of divergence of mitochondrial DNA completely different from those estimated for other anthozoans, and phylogenetic analyses indicate that Ceriantharia is not included within hexacorallians in most performed analyses. Thus, we propose that the Ceriantharia should be addressed as a separate clade.; Fapesp 2012/01771 (SNS), 2010/50174-7 (ACM), 2006/56211-6(MMM) and 2011/17537 (MVK); CNPq 481549/2012-9 (SNS) and (JDR)

A new species of Pachycerianthus (Cnidaria, Anthozoa, Ceriantharia) from Tropical Southwestern Atlantic

Stampar, Sergio Nascimento; Morandini, André Carrara; Silveira, Fabio Lang da
Fonte: Magnolia Press; Auckland Publicador: Magnolia Press; Auckland
Tipo: Artigo de Revista Científica
ENG
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A new species of Pachycerianthus (Cnidaria: Ceriantharia) is described from the Brazilian coast of the southwestern Atlantic Ocean. Pachycerianthus schlenzae sp.nov. is found in fine sand or mud in shallow waters of Abrolhos and Royal Charlotte Bank. The new species is only known from this area and is most notably different from other species of the genus Pachycerianthus in mesentery arrangement and cnidome. In addition to the description, we provide some biological data collected from individuals cultivated under laboratory conditions.; SNS was supported by CAPES through Programa de Pós-Graduação em Zoologia, IBUSP. This work was partly supported by São Paulo Research Foundation (FAPESP)[Proc n. 2010/50174-7 to ACM and 2012/01771-8 to SNS], and CNPq Proc n. 481549/2012-9 to SNS and 301039/2013-5 to ACM. We are grateful to Drs. Debora O. Pires and Clovis B. Castro for providing access to the material of MNRJ and Dr. Leen P. van Ofwegen for providing access to the material of NATURALIS. We are also indebted to M.S. da Hora for the help in sampling and Drs. Claudio Sampaio and Rodrigo Maia-Nogueira for providing images. We would like to thank Drs. Kennet Lundin (Gothenburg Natural History Museum), Chaolun Allen Chen (BRCAS...

Ceriantharia: a retomada de um clado esquecido; Ceriantharia: the resumption of a forgotten clade

Stampar, Sérgio Nascimento
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 12/04/2012 PT
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A sistemática de Cnidaria Anthozoa foi revisada inúmeras vezes e por vários autores, sendo que os Ceriantharia sempre foram avaliados através de dados clássicos e muito pretéritos. O clado Ceriantharia, uma ordem dentre Hexacorallia, apresenta muitos caracteres dúbios e que poderiam colocar os animais em várias posições sistemáticas dentre Cnidaria. Ainda, as revisões de Ceriantharia são sempre derivadas de análises das mesmas espécies, principalmente do Mar Mediterrâneo. O presente trabalho tem como enfoque a discussão dos caracteres taxonômicos (morfológicos e moleculares) de Ceriantharia, sua posição sistemática, levantamento taxonômico de áreas no Oceano Atlântico praticamente inexploradas para o grupo e aspectos da biologia das espécies encontradas. Os resultados apontam para uma nova posição sistemática de Ceriantharia, levando o grupo à base de Anthozoa e como um ramo independente. A utilização de dados moleculares evidenciou o vigor do emprego de DNA barcoding na zoologia comparada de Ceriantharia. Aspectos de especiação e de revisão sistemática resultaram pelas análises moleculares. Ao mesmo tempo, os dados morfológicos são extremamente confusos e muito do que foi utilizado como caractere de delimitação de espécies pela tradição de se assumir homologias com Actiniaria é...

Biodiversidade de octocorais (Anthozoa: Octocorallia) de substrato consolidado do entorno da ilha de Santa Catarina

David, Tatiana Ferraz
Fonte: Florianópolis, SC. Publicador: Florianópolis, SC.
Tipo: Trabalho de Conclusão de Curso Formato: 100
PT_BR
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TCC(graduação) - Universidade Federal de Santa Catarina. Centro de Ciências Biológicas. Biologia.; Os octocorais pertencem ao Filo Cnidaria, Classe Anthozoa, Subclasse Octocorallia, formando o grupo mais homogêneo dentro dos cnidários. Apesar de distribuídos por toda a costa brasileira e terem sido melhor estudados a partir do início da década de 80, ainda hoje se percebe uma carência no conhecimento desse grupo. Uma forma de se obter mais informações a respeito dos octocorais (e dos demais grupos animais) é através do estudo de exemplares presentes em coleções zoológicas. Na Universidade Federal de Santa Catarina (UFSC), o departamento de Ecologia e Zoologia (ECZ) do Centro de Ciências Biológicas (CCB) está em processo de oficialização de suas coleções zoológicas, sendo uma destas a Coleção de Cnidaria. Ademais, novos espécimes de Cnidaria têm sido obtidos a partir de 2010, através das coletas do Projeto Biodiversidade Marinha de Santa Catarina, do Laboratório de Biodiversidade Marinha da UFSC. Nesse contexto, o presente trabalho teve como objetivo fazer um levantamento dos octocorais depositados na Coleção de Cnidaria da UFSC e no Laboratório de Biodiversidade Marinha. Os exemplares estudados foram coletados em praias e em ilhas do entorno da Ilha de Santa Catarina entre a década de 1980 e o ano de 2012. Os exemplares foram identificados em laboratório através da análise de características macro e microscópicas...

Pax gene diversity in the basal cnidarian Acropora millepora (Cnidaria, Anthozoa): Implications for the evolution of the Pax gene family

Miller, David J.; Hayward, David C.; Reece-Hoyes, John S.; Scholten, Ingo; Catmull, Julian; Gehring, Walter J.; Callaerts, Patrick; Larsen, Jill E.; Ball, Eldon E.
Fonte: The National Academy of Sciences Publicador: The National Academy of Sciences
Tipo: Artigo de Revista Científica
Publicado em 25/04/2000 EN
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Pax genes encode a family of transcription factors, many of which play key roles in animal embryonic development but whose evolutionary relationships and ancestral functions are unclear. To address these issues, we are characterizing the Pax gene complement of the coral Acropora millepora, an anthozoan cnidarian. As the simplest animals at the tissue level of organization, cnidarians occupy a key position in animal evolution, and the Anthozoa are the basal class within this diverse phylum. We have identified four Pax genes in Acropora: two (Pax-Aam and Pax-Bam) are orthologs of genes identified in other cnidarians; the others (Pax-Cam and Pax-Dam) are unique to Acropora. Pax-Aam may be orthologous with Drosophila Pox neuro, and Pax-Bam clearly belongs to the Pax-2/5/8 class. The Pax-Bam Paired domain binds specifically and preferentially to Pax-2/5/8 binding sites. The recently identified Acropora gene Pax-Dam belongs to the Pax-3/7 class. Clearly, substantial diversification of the Pax family occurred before the Cnidaria/higher Metazoa split. The fourth Acropora Pax gene, Pax-Cam, may correspond to the ancestral vertebrate Pax gene and most closely resembles Pax-6. The expression pattern of Pax-Cam, in putative neurons, is consistent with an ancestral role of the Pax family in neural differentiation and patterning. We have determined the genomic structure of each Acropora Pax gene and show that some splice sites are shared both between the coral genes and between these and Pax genes in triploblastic metazoans. Together...

Hetero-oligomeric tagging diminishes non-specific aggregation of target proteins fused with Anthozoa fluorescent proteins.

Bulina, Maria E; Verkhusha, Vladislav V; Staroverov, Dmitry B; Chudakov, Dmitry M; Lukyanov, Konstantin A
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 01/04/2003 EN
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The tendency for tetramerization is the main disadvantage in the green fluorescent protein homologues from Anthozoa species. We report a universal method called hetero-oligomeric tagging, which diminishes troublesome consequences of tetramerization of Anthozoa-derived fluorescent proteins (FP) in intracellular protein labelling. This approach is based on the co-expression of the FP-tagged protein of interest together with an excess of free non-fluorescent FP mutant. The resulting FP heterotetramers contain only a single target polypeptide and, therefore, can be considered pseudo-monomeric. Feasibility of the method has been demonstrated with a red FP fused with cytoplasmic beta-actin or tubulin-binding protein Tau34. In addition, heterotetramers appeared to be a unique model for biophysical characterization of Anthozoa FPs in pseudo-monomeric state.

Correlated evolution of sex and reproductive mode in corals (Anthozoa: Scleractinia)

Kerr, Alexander M.; Baird, Andrew H.; Hughes, Terry P.
Fonte: The Royal Society Publicador: The Royal Society
Tipo: Artigo de Revista Científica
EN
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Sexuality and reproductive mode are two fundamental life-history traits that exhibit largely unexplained macroevolutionary patterns among the major groups of multicellular organisms. For example, the cnidarian class Anthozoa (corals and anemones) is mainly comprised of gonochoric (separate sex) brooders or spawners, while one order, Scleractinia (skeleton-forming corals), appears to be mostly hermaphroditic spawners. Here, using the most complete phylogeny of scleractinians, we reconstruct how evolutionary transitions between sexual systems (gonochorism versus hermaphrodism) and reproductive modes (brooding versus spawning) have generated large-scale taxonomic patterns in these characters. Hermaphrodites have independently evolved in three large, distantly related lineages consisting of mostly reef-building species. Reproductive mode in corals has evolved at twice the rate of sexuality, while the evolution of sexuality has been heavily biased: gonochorism is over 100 times more likely to be lost than gained, and can only be acquired by brooders. This circuitous evolutionary pathway accounts for the prevalence of hermaphroditic spawners among reef-forming scleractinians, despite their ancient gonochoric heritage.

Palytoxin Found in Palythoa sp. Zoanthids (Anthozoa, Hexacorallia) Sold in the Home Aquarium Trade

Deeds, Jonathan R.; Handy, Sara M.; White, Kevin D.; Reimer, James D.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 04/04/2011 EN
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Zoanthids (Anthozoa, Hexacorallia) are colonial anemones that contain one of the deadliest toxins ever discovered, palytoxin (LD50 in mice 300 ng/kg), but it is generally believed that highly toxic species are not sold in the home aquarium trade. We previously showed that an unintentionally introduced zoanthid in a home aquarium contained high concentrations of palytoxin and was likely responsible for a severe respiratory reaction when an individual attempted to eliminate the contaminant colonies using boiling water. To assess the availability and potential exposure of palytoxin to marine aquarium hobbyists, we analyzed zoanthid samples collected from local aquarium stores for palytoxin using liquid chromatography and high resolution mass spectrometry and attempted to identify the specimens through genetic analysis of 16S and cytochrome c oxidase 1 (COI) markers. We found four specimens of the same apparent species of zoanthid, that we described previously to be responsible for a severe respiratory reaction in a home aquarium, to be available in three aquarium stores in the Washington D.C. area. We found all of these specimens (n = 4) to be highly toxic with palytoxin or palytoxin-like compounds (range 0.5–3.5 mg crude toxin/g zoanthid). One of the most potent non-protein compounds ever discovered is present in dangerous quantities in a select species of zoanthid commonly sold in the home aquarium trade.

Evolutionary Diversification of Banded Tube-Dwelling Anemones (Cnidaria; Ceriantharia; Isarachnanthus) in the Atlantic Ocean

Stampar, Sergio N.; Maronna, Maximiliano M.; Vermeij, Mark J. A.; Silveira, Fabio L. d.; Morandini, André C.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 16/07/2012 EN
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The use of molecular data for species delimitation in Anthozoa is still a very delicate issue. This is probably due to the low genetic variation found among the molecular markers (primarily mitochondrial) commonly used for Anthozoa. Ceriantharia is an anthozoan group that has not been tested for genetic divergence at the species level. Recently, all three Atlantic species described for the genus Isarachnanthus of Atlantic Ocean, were deemed synonyms based on morphological simmilarities of only one species: Isarachnanthus maderensis. Here, we aimed to verify whether genetic relationships (using COI, 16S, ITS1 and ITS2 molecular markers) confirmed morphological affinities among members of Isarachnanthus from different regions across the Atlantic Ocean. Results from four DNA markers were completely congruent and revealed that two different species exist in the Atlantic Ocean. The low identification success and substantial overlap between intra and interspecific COI distances render the Anthozoa unsuitable for DNA barcoding, which is not true for Ceriantharia. In addition, genetic divergence within and between Ceriantharia species is more similar to that found in Medusozoa (Hydrozoa and Scyphozoa) than Anthozoa and Porifera that have divergence rates similar to typical metazoans. The two genetic species could also be separated based on micromorphological characteristics of their cnidomes. Using a specimen of Isarachnanthus bandanensis from Pacific Ocean as an outgroup...

Sea Anemone (Cnidaria, Anthozoa, Actiniaria) Toxins: An Overview

Frazão, Bárbara; Vasconcelos, Vitor; Antunes, Agostinho
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
Publicado em 22/08/2012 EN
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The Cnidaria phylum includes organisms that are among the most venomous animals. The Anthozoa class includes sea anemones, hard corals, soft corals and sea pens. The composition of cnidarian venoms is not known in detail, but they appear to contain a variety of compounds. Currently around 250 of those compounds have been identified (peptides, proteins, enzymes and proteinase inhibitors) and non-proteinaceous substances (purines, quaternary ammonium compounds, biogenic amines and betaines), but very few genes encoding toxins were described and only a few related protein three-dimensional structures are available. Toxins are used for prey acquisition, but also to deter potential predators (with neurotoxicity and cardiotoxicity effects) and even to fight territorial disputes. Cnidaria toxins have been identified on the nematocysts located on the tentacles, acrorhagi and acontia, and in the mucous coat that covers the animal body. Sea anemone toxins comprise mainly proteins and peptides that are cytolytic or neurotoxic with its potency varying with the structure and site of action and are efficient in targeting different animals, such as insects, crustaceans and vertebrates. Sea anemones toxins include voltage-gated Na+ and K+ channels toxins...

Sox genes in the coral Acropora millepora: divergent expression patterns reflect differences in developmental mechanisms within the Anthozoa

Shinzato, Chuya; Iguchi, A; Hayward, David; Technau, Ulrich; Ball, Eldon E; Miller, David J
Fonte: Universidade Nacional da Austrália Publicador: Universidade Nacional da Austrália
Tipo: Journal article; Published Version Formato: 16 pages
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BACKGROUND: Sox genes encode transcription factors that function in a wide range of developmental processes across the animal kingdom. To better understand both the evolution of the Sox family and the roles of these genes in cnidarians, we are studying the Sox gene complement of the coral, Acropora millepora (Class Anthozoa). RESULTS: Based on overall domain structures and HMG box sequences, the Acropora Sox genes considered here clearly fall into four of the five major Sox classes. AmSoxC is expressed in the ectoderm during development, in cells whose morphology is consistent with their assignment as sensory neurons. The expression pattern of the Nematostella ortholog of this gene is broadly similar to that of AmSoxC, but there are subtle differences – for example, expression begins significantly earlier in Acropora than in Nematostella. During gastrulation, AmSoxBb and AmSoxB1 transcripts are detected only in the presumptive ectoderm while AmSoxE1 transcription is restricted to the presumptive endoderm, suggesting that these Sox genes might play roles in germ layer specification. A third type B Sox gene, AmSoxBa, and a Sox F gene AmSoxF also have complex and specific expression patterns during early development. Each of these genes has a clear Nematostella ortholog...

The "Naked Coral" hypothesis revisited – evidence for and against scleractinian monophyly

Kitahara, Marcelo V.; Lin, Mei-Fang; Forêt, Sylvain; Huttley, Gavin; Miller, David J.; Chen, Chaolun Allen
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica Formato: 13 pages
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The relationship between Scleractinia and Corallimorpharia, Orders within Anthozoa distinguished by the presence of an aragonite skeleton in the former, is controversial. Although classically considered distinct groups, some phylogenetic analyses have placed the Corallimorpharia within a larger Scleractinia/Corallimorpharia clade, leading to the suggestion that the Corallimorpharia are "naked corals" that arose via skeleton loss during the Cretaceous from a Scleractinian ancestor. Scleractinian paraphyly is, however, contradicted by a number of recent phylogenetic studies based on mt nucleotide (nt) sequence data. Whereas the "naked coral" hypothesis was based on analysis of the sequences of proteins encoded by a relatively small number of mt genomes, here a much-expanded dataset was used to reinvestigate hexacorallian phylogeny. The initial observation was that, whereas analyses based on nt data support scleractinian monophyly, those based on amino acid (aa) data support the "naked coral" hypothesis, irrespective of the method and with very strong support. To better understand the bases of these contrasting results, the effects of systematic errors were examined. Compared to other hexacorallians, the mt genomes of "Robust" corals have a higher (A+T) content...

Components of both major axial patterning systems of the Bilateria are differentially expressed along the primary axis of a 'radiate' animal, the anthozoan cnidarian Acropora millepora

de Jong, Danielle M.; Hislop, Nikki R.; Hayward, David C.; Reece-Hoyes, John S.; Pontynen, Patricia C.; Ball, Eldon E.; Miller, David J.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2006
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Cnidarians are animals with a single (oral/aboral) overt body axis and with origins that nominally predate bilaterality. To better understand the evolution of axial patterning mechanisms, we characterized genes from the coral, Acropora millepora (Class Anthozoa) that are considered to be unambiguous markers of the bilaterian anterior/posterior and dorsal/ventral axes. Homologs of Otx/otd and Emx/ems, definitive anterior markers across the Bilateria, are expressed at opposite ends of the Acropora larva; otxA-Am initially around the blastopore and later preferentially toward the oral end in the ectoderm, and emx-Am predominantly in putative neurons in the aboral half of the planula larva, in a domain overlapping that of cnox-2Am, a Gsh/ind gene. The Acropora homologs of Pax-3/7, NKX2.1/vnd and Msx/msh are expressed in axially restricted and largely non-overlapping patterns in larval ectoderm. In Acropora, components of both the D/V and A/P patterning systems of bilateral animals are therefore expressed in regionally restricted patterns along the single overt body axis of the planula larva, and two 'anterior' markers are expressed at opposite ends of the axis. Thus, although some specific gene functions appear to be conserved between cnidarians and higher animals...

Deltocyathiidae, an early-diverging family of Robust corals (Anthozoa, Scleractinia)

Kitahara, Marcelo Visentini; Cairns, Stephen D; Stolarski, Jaroslaw; Miller, David J
Fonte: New Jersey Publicador: New Jersey
Tipo: Artigo de Revista Científica
ENG
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Over the last decade, molecular phylogenetics has called into question some fundamental aspects of coral systematics. Within the Scleractinia, most families composed exclusively by zooxanthellate species are polyphyletic on the basis of molecular data, and the second most speciose coral family, the Caryophylliidae (most members of which are azooxanthellate), is an unnatural grouping. As part of the process of resolving taxonomic affinities of caryophylliids', here a new Robust' scleractinian family (Deltocyathiidae fam. n.) is proposed on the basis of combined molecular (CO1 and 28S rDNA) and morphological data, accommodating the early-diverging clade of traditional caryophylliids (represented today by the genus Deltocyathus). Whereas this family captures the full morphological diversity of the genus Deltocyathus, one species, Deltocyathus magnificus, is an outlier in terms of molecular data, and groups with the Complex coral family Turbinoliidae. Ultrastructural data, however, place D.magnificus within Deltocyathiidae fam. nov. Unfortunately, limited ultrastructural data are as yet available for turbinoliids, but D.magnificus may represent the first documented case of morphological convergence at the microstructural level among scleractinian corals. Marcelo V.Kitahara...

Reproductive biology of Palythoa caribaeorum and Protopalythoa variabilis (Cnidaria, Anthozoa, Zoanthidea) from the southeastern coast of Brazil

Boscolo,H. K.; Silveira,F. L.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2005 EN
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The reproductive biology of Palythoa caribaeorum (Duchassaing & Michelotti 1860) and Protopalythoa variabilis (Duerden 1898) was studied through monthly samples from tagged colonies from June 1996 to June 1997, in São Sebastião channel, São Paulo, Brazil (45º26'W, 23º50'S). The gametogenesis was similar to that of other zoanthids as shown by histological preparations. Oocyte diameters and maturation stages of testis vesicles were evaluated on squash preparations. Both species showed sequential protogynic hermaphroditism, with high frequency of fertile polyps (83% in P. variabilis and 72% in P. caribaeorum), high frequency of colonies in female sex condition (65.3% of P. variabilis and 41.7% of P. caribaeorum), and apparently continuous gametogenesis. In P. caribaeorum, egg release was continuous and sperm release took place during half of the analyzed period. In P. variabilis, egg and sperm release occurred in April-May and February-March 1997, respectively.

Late Carboniferous colonial Rugosa (Anthozoa) from Alaska

Fedorowski, J.; Stevens, C. H.
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //2014 ENG
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Late Carboniferous colonial corals from the Moscovian Saginaw Bay Formation and the underlying Bashkirian crinoidal limestone exposed on northeastern Kuiu Island and a nearby islet, part of the Alexander terrane in southeastern Alaska, are described and illustrated for the first time, and are supplemented by revision, re-description and re-illustration of most Atokan specimens from Brooks Range, northern Alaska, first described by Armstrong (1972). New taxa from the Kuiu Island area include the new species Paraheritschioides katvalae and the new genus and species Arctistrotion variabilis, as well as the new Subfamily Arctistrotioninae. The corals Corwenia jagoensis and Lithostrotionella wahooensis of Armstrong (1972) also are redefined and redescribed. Paraheritschioides jagoensis is based on the holotype of ‘C’. jagoensis. P. compositus sp. nov. is based on a “paratype” of ‘C.’ jagoensis. In addition to a redefinition and redescription of ‘L.’ wahooensis as Arctistrotion wahooense, one “paratype” of that species is described as A. simplex sp. nov. The phylogeny and suspected relationships of some fasciculate Carboniferous Rugosa also are discussed. Based on relationships and similarities within the Late Carboniferous colonial Rugosa from the Brooks Range...

Calliactis tricolor (Anthozoa, Acontiaria) epibiosis on Brachyura (Crustacea, Decapoda) at the South of Paraná and North of Santa Catarina coast; Calliactis tricolor (Anthozoa, Acontiaria) epibionte em Brachyura (Crustacea, Decapoda) no litoral sul do Paraná e Norte de Santa Catarina

Nogueira Jr., Miodeli; UFPR; Robert, Maurício de Castro; ufpr; Haddad, Maria Angélica; urpr
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/11/2006 POR
Relevância na Pesquisa
27.34%
A pesquisa sobre associações entre organismos de diferentes taxasão importantes para a compreensão da estrutura, dinâmica eevolução de uma comunidade. Entre as diversas associaçõesenvolvendo cnidários, a epibiose de anêmonas-do-mar é uma dasmais amplamente relatadas (e.g., CUTRESS & ROSS, 1969; CUTRESS, ROSS & SUTTON, 1970; ROSS, 1971, 1974a, b, 1983; BACH & HERRNKIND, 1980; CHINTIRIGLOU, DOUMENC & KOUTSOUBAS, 1992; PASTORINO, 1993; ATES, 1995a, b; CHRISTIDS, CHINTIRIGLOU & CULLEY, 1997; ACUÑA, EXCOFFON & SCELZO, 2003). Registros de anêmonas associadas a gastrópodes e pagurídeos, respectivamente cerca de 30 e 60 pares de espécies combinadas (ATES, 1995a), são mais freqüentes do que associações com braquiúros, relatadas somente com algumas espécies de majídeos e calapídeos (CUTRESS, ROSS & SUTTON, 1970; ROSS, 1974b, 1983; ACUÑA, EXCOFFON & SCELZO, 2003; LARENAS, 2004; WINTER & MASUNARI, 2006; LARENAS, 2004). Nestas associações, considerase que as anêmonas ganham maior mobilidade, aumentando assim sua disponibilidade alimentar e...

Species composition and bathymetric distribution of gorgonians (Anthozoa: Octocorallia) on the Southern Mexican Pacific coast

Abeytia,Rosalinda; Guzmán,Héctor M.; Breedy,Odalisca
Fonte: Revista de Biología Tropical Publicador: Revista de Biología Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2013 EN
Relevância na Pesquisa
27.05%
Gorgonians are important components of coastal ecosystems, as they provide niches, natural compounds with medical applications and are used as bioindicators. Species composition and assemblage structure of gorgonians (Anthozoa: Octocorallia) were studied along a bathymetric profile in the Southern Mexican Pacific coast. Species composition was based on specimens collected within a depth range of 0-70m in 15 sites. The relative abundance of species was determined in six sites at four depths (5, 10, 20 and 25m) using three 10m2 transects at each depth level. Twenty-seven species of gorgonians belonging to six genera and three families were registered. The species composition varied with depth: 11 species were distributed between 0-25m depth, while 17 species were found between 40-70m depth interval. The shallow zone is characterized by a relatively large abundance of gorgonians, dominated by colonies of Leptogorgia cuspidata and L. ena. In contrast, the deepest zone was characterized by relatively low abundance of gorgonians, dominated by L. alba, the only species observed in both depth intervals. The similarity analysis showed differences in the composition and abundance of species by depth and site, suggesting that the main factor in determining the assemblage structure is depth. Results of this study suggest that the highest richness of gorgonian species in the study area may be located at depths of 40-70m...