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| Registros recuperados: 38 | |
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| Pierrot-Bults, A.C.; Spoel, S. van der. |
| Pelagic species are widely distributed in a horizontal plane and have three-dimensional distributions, since the sea covers about 70% of the surface of the earth, and on average 4 km deep. For most macrozooplankton and micronekton groups there seems to be no great expectations of finding new taxa with the exception of gelatinous groups and of the deep sea, which is a relatively unknown especially in the benthopelagic zone close to the sea-bed. However, we do not know very much about variation, either morphological or genetical, within socalled species in different parts of their range. We think we are dealing with single very broadly distributed species, which, in reality, are species complexes consisting of several more or less cryptic species or... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Pelagic macrozooplankton/micronekton diversity; Biogeographic patterns; Genetic variation; Morphological variation; Cryptic species; 42.79. |
| Ano: 2003 |
URL: http://www.repository.naturalis.nl/record/220316 |
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| Jolly, Mt; Jollivet, D; Gentil, F; Thiebaut, E; Viard, F. |
| This study uses enzymatic and mitochondrial genes to infer the relative importance of historical processes and contemporary hydrodynamic features on the observed patterns of genetic structure in subdivided populations of Pectinaria koreni (Polychaeta: Pectinariidae) along the coasts of Brittany and the English Channel. Nucleotide sequence variation of a 603-bp fragment of the mtDNA cytochrome oxidase subunit I gene revealed a surprisingly deep phylogeographic break of about 16% divergence separating the Brittany and Channel populations, which coincides with a biogeographic boundary along the western coast of Brittany. Deep sequence divergence with fixed haplotype differences and the inversion of allele frequencies at two enzyme loci suggests the occurrence... |
| Tipo: Text |
Palavras-chave: Phylogeography; Allozymes; MtDNA; Parapatric boundary; Cryptic species. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00301/41250/40433.pdf |
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| Artoni,Roberto Ferreira; Shibatta,Oscar Akio; Gross,Maria Claudia; Schneider,Carlos Henrique; Almeida,Mara Cristina de; Vicari,Marcelo Ricardo; Bertollo,Luiz Antonio Carlos. |
| Four populations of Astyanax aff. fasciatus of the upper rio Tibagi (municipal district of Ponta Grossa, Paraná State, Brazil), had their karyotypes and morphometry analyzed. The cytogenetic data show the occurrence of distinct karyotypes (cytotypes), here named cytotype A, with 2n=48 chromosomes (6m+18sm+14st+10a), cytotype B, with 2n=50 chromosomes (8m+18sm+14st+10a) and cytotype C, with 2n=50 chromosomes (8m+18sm+14st+10a). The distribution pattern of the constitutive heterochromatin was very similar between cytotypes A and B, but diverged in relation to cytotype C. Distinct cytotypes may occur in sympatry in the upper rio Tibagi region, with the exception of the Furna 2 sample, which presents cytotype A exclusively. In addition, a specimen with 2n=49... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tetra; Morphometrics; Karyotype; Sympatry; Cryptic species. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200005 |
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| González,Susana; Duarte,José Mauricio Barbanti. |
| Documenting the presence and abundance of the neotropical mammals is the first step for understanding their population ecology, behavior and genetic dynamics in designing conservation plans. The combination of field research with molecular genetics techniques are new tools that provide valuable biological information avoiding the disturbance in the ecosystems, trying to minimize the human impact in the process to gather biological information. The objective of this paper is to review the available non invasive sampling techniques that have been used in Neotropical mammal studies to apply to determine the presence and abundance, population structure, sex ratio, taxonomic diagnostic using mitochondrial markers, and assessing genetic variability using nuclear... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cryptic species; Fecal DNA; Non invasive sampling. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007001000011 |
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| Malay, Maria Celia (machel) D.; Paulay, Gustav. |
| The diversity on coral reefs has long captivated observers. We examine the mechanisms of speciation, role of ecology in speciation, and patterns of species distribution in a typical reef-associated clade-the diverse and colorful Calcinus hermit crabs-to address the origin of tropical marine diversity. We sequenced COI, 16S, and H3 gene regions for similar to 90% of 56 putative species, including nine undescribed, "cryptic" taxa, and mapped their distributions. Speciation in Calcinus is largely peripatric at remote locations. Allopatric species pairs are younger than sympatric ones, and molecular clock analyses suggest that > 2 million years are needed for secondary sympatry. Substantial niche conservatism is evident within clades, as well as a few major... |
| Tipo: Text |
Palavras-chave: Allopatric speciation; Biodiversity; Biogeography; Color pattern evolution; Circumtropical speciation; Coral reef; Coral triangle; Cryptic species; Crustacea; ESU; Indo-Malayan hot spot; Molecular phylogenetics; Sympatric speciation. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00495/60623/64108.pdf |
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| Koperski, P.; Milanowski, R.; Krzyk, A.. |
| The main aim of this study was to reveal reproduction barriers and potentially cryptic radiation within the very common and morphologically variable leech species - Erpobdella octoculata (L., 1758). The differences in reproductive success of the morphological forms were compared experimentally. The data based on the results of field sampling and analysis of ITS and COI sequences is also presented. The results of the analysis of DNA sequences clearly show lack of reproduction barriers between the analysed morphological forms. Subtle differences in DNA sequences between individuals, found with the use of the arbitrary primers method, seem to be related mainly to geographical distance between sub-populations. On the basis of these results, E. octoculata... |
| Tipo: Article / Letter to the editor |
Palavras-chave: COI; Cryptic species; Discordance; Hirudinea; ITS; Molecular taxonomy; 42.76. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/369712 |
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| Silva,João Paulo C.B. da; Carvalho,Marcelo R. de. |
| Potamotrygon tatianae sp. nov., is described from Río Madre de Díos, Peru, upper Rio Madeira basin. The new species is distinguished from all congeners by a unique combination of characters, including its dorsal color pattern formed by a relatively slender, highly convoluted, beige to dark brown vermicular pattern, a single row of dorsal tail spines, and a relatively longer tail posterior to caudal stings. Potamotrygon tatianae sp. nov., occurs sympatrically with other species of Potamotrygon (P. falkneri, P. orbignyi and P. motoro). From the similar species P. falkneri, P. tatianae sp. nov., is further distinguished by the absence of circular, reniform, and oval spots, by its proportionally much longer tail, by having dorsal tail spines in one irregular... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Potamotrygon tatianae sp. nov.; Potamotrygon falkneri; Taxonomy; Morphology; Cryptic species; Río Madeira; South America. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011000800001 |
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| Orihara, T.; Smith, M.E.; Shimomura, N.; Iwase, K.; Maekawa, N.. |
| The sequestrate fungi of Japan, including truffle and truffle-like fungi, have not been well characterized but are potentially diverse. We investigated the diversity and phylogeny of Japanese Octaviania specimens using a multifaceted approach including scanning and transmission electron microscopy as well as analysis of nuclear ribosomal DNA (ITS and LSU) and EF-1α (tef1) sequences. Phylogenetic analyses indicate that the genus Octaviania is divided into three major clades, and that there are at least 12 species-level lineages in Japan. Accordingly, we describe two new subgenera, Parcaea and Fulvoglobus, and eleven new species. Subgenus Parcaea accommodates four highly divergent, but macromorphologically almost indiscernible cryptic species. We discuss not... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Biogeography; Boletaceae; Cryptic species; Hypogeous fungi; Phylogeny; Taxonomy. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/531994 |
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| Endo, Kátia Sayuri; Universidade Estadual de Maringá; Martinez, Emanuel Ricardo Monteiro; Universidade Estadual Paulista “Júlio de Mesquita Filho" / Botucatu-SP; Zawadzki, Claudio Henrique; Universidade Estadual de Maringa; Paiva, Luiz Ricardo de Souza; Universidade Estadual Paulista “Júlio de Mesquita Filho" / Botucatu-SP; Júlio Júnior, Horácio Ferreira; Universidade Estadual de Maringá. |
| Cytogenetic analyses were performed in four species of the Hypostominae subfamily, three from Hypostomus (Hypostomini) genus and Rhinelepis aspera (Rhinelepini). Three populations of Hypostomus ancistroides were analyzed, which had 2n=68 chromosomes, but presented different karyotype formulas. Hypostomus regani and H. strigaticeps, both from Ivaí river, showed 2n=72 chromosomes with two distinct cytotypes. In turn, R. aspera of the upper Paraná river basin presented 2n=54 chromosome. Multiple Nucleolar Organizer Regions (NORs) have been evidenced by silver nitrate staining in species of Hypostomus and single NOR in R. aspera. The observed variation in the chromosome number and the marked variability in karyotype formulas and NORs reveal a certain amount of... |
| Tipo: Estudos cromossômicos |
Palavras-chave: 2.02.04.00-0 chromosomal evolution; Cryptic species; Neotropical fishes; NOR Genética Animal. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/9318 |
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| Borda, Elizabeth; Kudenov, Jerry D.; Chevaldonne, Pierre; Blake, James A.; Desbruyeres, Damien; Fabri, Marie-claire; Hourdez, Stephane; Pleijel, Fredrik; Shank, Timothy M.; Wilson, Nerida G.; Schulze, Anja; Rouse, Greg W.. |
| Since its description from the Galapagos Rift in the mid-1980s, Archinome rosacea has been recorded at hydrothermal vents in the Pacific, Atlantic and Indian Oceans. Only recently was a second species described from the Pacific Antarctic Ridge. We inferred the identities and evolutionary relationships of Archinome representatives sampled from across the hydrothermal vent range of the genus, which is now extended to cold methane seeps. Species delimitation using mitochondrial cytochrome c oxidase subunit I (COI) recovered up to six lineages, whereas concatenated datasets (COI, 16S, 28S and ITS1) supported only four or five of these as clades. Morphological approaches alone were inconclusive to verify the identities of species owing to the lack of discrete... |
| Tipo: Text |
Palavras-chave: Deep sea; Hydrothermal vents; Cold methane seeps; Cryptic species; Polychaete. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00157/26814/24961.pdf |
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| Fernandes,Noemi M.; Silva Neto,Inácio D. da. |
| Species of Spirostomum Ehrenberg, 1838 are widely used as model organisms in ecological studies of environmental impacts and symbioses between ciliates and human pathogenic bacteria. However, the taxonomy of this genus is confused by the superficiality of the morphological descriptions of its included species, and the use of only a few characters for their differentiation. The present study provides details of total infraciliature, nuclear apparatus, morphometric data and 18S rDNA gene sequences of Spirostomum teres Claparède & Lachmann, 1858 and Spirostomum minus Roux, 1901, isolated from a sewage treatment plant and a freshwater lake in the city of Rio de Janeiro, Brazil, respectively. For the morphological descriptions of S. teres and S. minus,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioindicators; Ciliates; Cryptic species; Heterotrichs; Morphology. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000100009 |
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| Weber, Alexandra Anh-thu; Stohr, Sabine; Chenuil, Anne. |
| Cryptic species are numerous in the marine environment. The brittle star Ophioderma longicauda is composed of six mitochondrial lineages, encompassing brooders, which form a monophyletic group, and broadcasters, from which the brooders are derived. To clarify the species limits within O. longicauda, we compared the reproductive status of the sympatric lineages L1 and L3 (defined after sequencing a portion of the mitochondrial gene COI) during the month of May in Greece. In addition, we genotyped a nuclear marker, intron i51. Each L3 female was brooding, whereas all L1 specimens displayed full gonads, suggesting temporal pre-zygotic isolation between brooders and broadcasters. Statistical differences were found among lineages in morphology and bathymetric... |
| Tipo: Text |
Palavras-chave: Ophiuroidea; Espèces cryptiques; Espèce incubante; Sous-unité I de la cytochrome oxydase; EPIC; Ophiuroidea; Cryptic species; Brooding species; Cytochrome oxidase subunit I; EPIC. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00372/48271/48576.pdf |
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| Biju, S.D.; Garg, S.; Mahony, S.; Wijayathilaka, N.; Senevirathne, G.; Meegaskumbura, M.. |
| A systematic revision of the genus Hylarana in the Western Ghats-Sri Lanka biodiversity hotspot is presented. Species delineation in Hylarana is complicated due to a lack of distinct colour differences or striking morphological characters, leading to potential misidentification. We conducted extensive surveys throughout the Western Ghats-Sri Lanka biodiversity hotspot and performed multiple gene (16S, COI and Cytb) barcoding using 103 samples collected from cultivated land and natural habitats. Genetic distance comparisons and Neighbor Joining trees indicated the presence of at least 14 candidate species in the region, supported by taxa groupings for all three genetic markers. Utilising a combination of molecular and morphological data, we describe seven... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Amphibia; Cryptic species; Endemism; Integrative taxonomy; Lectotypification; Multiple gene barcoding; Neotypification; Taxonomic revision; 42.82; 42.64. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/506456 |
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| Zanini,Rebeca; Deprá,Maríndia; Valente,Vera Lúcia da Silva. |
| ABSTRACT In several arthropod groups, male genitalia is the most important feature for species identification, especially in cryptic species. Cryptic species are very common in the Drosophila genus, and the Neotropical Drosophila willistoni species group is a good example. This group currently includes 24 species divided into three subgroups: alagitans, bocainensis and willistoni. There are six sibling species in the willistoni subgroup – D. willistoni, D. insularis, D. tropicalis, D. equinoxialis, D. pavlovskiana and D. paulistorum, which is a species complex composed of six semispecies – Amazonian, Andean-Brazilian, Centroamerican, Interior, Orinocan and Transitional. The objective of this study was to characterize male genitalia of the willistoni... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cryptic species; Drosophila willistoni subgroup; Drosophila paulistorum complex; Male genitalia; Semispecies. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262015000400323 |
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| Registros recuperados: 38 | |
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