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Registros recuperados: 86
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A new long-finned Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the lower rio Paraná basin, Brazil Neotropical Ichthyology
Tencatt,Luiz F. C.; Britto,Marcelo R.; Pavanelli,Carla S..
A new species of Corydoras is described from the lower rio Paraná basin, just downstream from Itaipu Dam, Brazil, close to Paraguay boundary. The new species can be distinguished from most of its congeners by the infraorbital 2 with a posterior laminar expansion conspicuously reduced, first and second dorsal-fin branched rays conspicuously elongated in males, mesethmoid entirely covered by skin, and by the presence of four to six irregular black or brownish blotches on the midline of the flank. The probable occurrence of the new species in the floodplain of the upper portion of the rio Paraná drainage is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canal da Piracema; Corydoradinae; Itaipu dam; Sexual dimorphism; Taxonomy.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000100071
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A new miniature of Xenurobryconini (Characiformes: Characidae) from the rio Tapajós basin, Brazil Neotropical Ichthyology
Mendonça,Marina Barreira; Peixoto,Luiz Antônio Wanderley; Dutra,Guilherme Moreira; Netto-Ferreira,André Luiz.
Abstract A new species of Xenurobrycon isdescribed from tributaries of the rio Tapajós, Pará, Brazil. It is diagnosed from all congeners by the dark color of the posterior half of both caudal-fin lobes, the presence of infraorbitals one, two, and three, the presence of a set of lamellar processes on eighth principal caudal-fin ray of mature males, the presence of bony hooks similar in size or decreasing posteriorly on last unbranched and first 9-12 branched anal-fin rays of mature males, the presence of only conical teeth on both jaws, the lack of the adipose fin and the presence of 15-18 predorsal scales. The description of the new species increases the number of species in Xenurobrycon to six. An updated key to the species of the genus is provided.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Key to species; Miniaturization; Ostariophysi; Sexual dimorphism; Taxonomy.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100004
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A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil Neotropical Ichthyology
Zanata,Angela Maria; Burger,Rafael; Vita,George; Camelier,Priscila.
ABSTRACT A new species of Astyanax from tributaries of the rio de Contas, Bahia, Brazil, is described. The new species differs from congeners by having three horizontal series of scales from lateral line to pelvic-fin origin and the distal margin of third infraorbital distinctly separated from vertical and horizontal limbs of preopercle, leaving a broad area not covered by superficial bones. The new species further differs from most congeners by the presence of bony hooks on all fins of mature males. Particularly from congeners occurring in rivers of the Northeastern Mata Atlântica freshwater ecoregion, it further differs by having the highest body depth just anterior to the dorsal-fin origin, 34-37 pored lateral line scales, a vertically elongated...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Endemism; Northeastern Mata Atlântica freshwater ecoregion; Sexual dimorphism; Taxonomy.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000300208
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A new species of Chaetostoma Tschudi (Siluriformes: Loricariidae) from Colombia with a definition of the C. anale species group Pap. Avulsos de Zool. (São Paulo)
Ballen,Gustavo A..
Chaetostoma formosae sp. nov. is described from piedmont tributaries of the upper río Meta on the Cordillera Oriental in Colombia. The new species is distinguished from its congeners by the presence of an elongate unbranched anal-fin ray with two posterior dermal ridges in mature males, the presence of strongly recurved cheek odontodes, the presence of a parieto-supraoccipital dermal keel, the posterior margin of the pelvic-fin strongly projected and angulate in shape in mature males, and by details of coloration. The new species belongs to an informal monophyletic group herein called the Chaetostoma anale species group, along with two additional species, C. anale and C. jegui, from Colombia and Brazil respectively, based on an apomorphic modification of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Systematics; Ancistrini; Andes; Sexual dimorphism; Taxonomy.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011002600001
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A new species of Hyphessobrycon Durbin (Characiformes: Characidae) from the middle rio São Francisco and upper and middle rio Tocantins basins, Brazil, with comments on its biogeographic history Neotropical Ichthyology
Dagosta,Fernando C. P.; Marinho,Manoela M. F.; Camelier,Priscila.
A new species of Hyphessobrycon Durbin is described from tributaries of the rio Grande (rio São Francisco basin) draining east to the Serra Geral de Goiás, of the rio São Domingos (upper rio Tocantins basin) and rio do Sono basins (middle rio Tocantins basin). Hyphessobrycondiastatos can be diagnosed from its congeners by the absence of humeral spot, 15-18 branched anal-fin rays, 1-3 maxillary conical to tricuspid teeth, a relatively well-defined dark caudal-peduncle spot, and elongation of dorsal- and anal-fin rays in mature males. The biogeographical significance of the distribution of the new species is evaluated and discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adipose fin; Biogeography; Headwater capture; Serra Geral de Goiás; Sexual dimorphism.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200365
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A new species of HyphessobryconDurbin(Characiformes: Characidae) from the rio Juruena basin, Central Brazil, with notes on H. loweae Costa & Géry Neotropical Ichthyology
Ingenito,Leonardo F. S.; Lima,Flávio C. T.; Buckup,Paulo A..
A new species of Hyphessobrycon, H. peugeoti, is described from the middle portions of the rio Juruena drainage, upper rio Tapajós basin, Mato Grosso State, Brazil. It can be distinguished from all congeners, with the exception of H. loweae and H. heliacus, by a filamentous elongation of the dorsal fin and the approximately straight margin of the anal fin in adult males. It can be distinguished from both H. loweae and H. heliacus by an overall red coloration in life (vs. a golden coloration in life in the latter). Additionally, it can be distinguished from H. heliacus by the lack of chevron-like dark markings along the midline (vs. presence of chevron-like dark-markings in H. heliacus), and from H. loweae by the presence of only five horizontal scale rows...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Filamentous dorsal-fin; Hyphessobrycon elachys; Hyphessobrycon heliacus; Rio Tapajós basin; Rio Tocantins basin; Sexual dimorphism.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100033
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A new Tatia (Ostariophysi: Siluriformes: Auchenipteridae) from the rio Iguaçu basin, Paraná State, Brazil Neotropical Ichthyology
Pavanelli,Carla Simone; Bifi,Alessandro Gasparetto.
A new species of Tatia is described from the lower rio Iguaçu basin, Paraná State, Brazil. The new species is distinguishable from congeners by having large, irregular pale blotches over dark brown base coloration, absent longitudinal stripe, caudal fin with round to striate dark brown spots over light base in adults or entirely dark in juveniles, and by having a long humeral process. Sexual dimorphism of the new species is marked by differences among genital and urinary apertures, size proportions between upper and lower lobe of caudal fin, and size, width and presence of antrorse and retrorse spines on anal-fin rays.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropical; Freshwater fish; Sexual dimorphism; Catfish.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200010
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Age Effect in the Morphological Traits Performance for Sex Determination in Human Skulls and Mandibles International Journal of Morphology
Suazo Galdames,Iván; Zavando,Daniela.
In this study we tested the hypothesis that diagnostic performance of the morphological indicators for sexual dimorphism are reduced as they are applied in skull and mandibles of older subjects. We used 275 adult human skulls, 250 of these with mandible, all subjects with sex and age registry. Sixteen classic morphological indicators of sexual dimorphism were evaluated, this information was compared with the registry and results noted in terms of precision. The best general performance of morphological indicators of sexual dimorphism were recorded in the 31 - 40 and 61 - 70 years, age range groups. Lowest precision ws recorded in the group corresponding to subjects between 21 ­ 30 years. Our results do not support the proposed hypothesis and suggest a...
Tipo: Journal article Palavras-chave: Sexual dimorphism; Sex determination; Aging; Age; Skull.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100053
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Anatomy, functional morphology, evolutionary ecology and systematics of the invasive gastropod Cipangopaludina japonica (Viviparidae: Bellamyinae) Naturalis
Bocxlaer, B. Van; Strong, E.E..
The anatomy, functional morphology and evolutionary ecology of the Viviparidae, and the subfamily Bellamyinae in particular, are incompletely known. Partly as a result, genealogical relationships within the family remain poorly understood. Because of this lack in knowledge, few informed hypotheses exist on ancestral states, how differences in body plans between the subfamilies evolved, and how the peculiar biogeographic distribution patterns of viviparids have arisen. Here we document the anatomy, morphology, life history and systematics of Cipangopaludina japonica, a Japanese species that has been introduced into North America, to resolve taxonomic confusion and to improve our understanding of how form and function are related in bellamyines. Anatomical...
Tipo: Article / Letter to the editor Palavras-chave: Basal Architaenioglossa; Bellamya; Fecundity; Geometric morphometrics; Histology; Reproductive anatomy; Sexual dimorphism; 42.73.
Ano: 2016 URL: http://www.repository.naturalis.nl/record/609995
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Astyanax vermilion and Astyanax burgerai: new characid fishes (Ostariophysi: Characiformes) from Northeastern Bahia, Brazil Neotropical Ichthyology
Zanata,Angela M.; Camelier,Priscila.
Two new Astyanax species, A. vermilion, from rio Almada and rio Cachoeira, and A. burgerai, from rio Almada, Bahia State, Brazil, are described. Astyanax vermilion is distinguished from most of its congeners and from all other Astyanax species known from northeastern Brazilian drainages by having distal portion of pelvic fins dark, a combination of sexually dimorphic characters, posteroventral portion of body and fins (except pectoral) reddish in life, and inconspicuous humeral and caudal spots. It also differs by having highest body depth just anterior of dorsal-fin origin, 32-34 lateral-line scales, and presence of one or two maxillary teeth. Astyanax burgerai is diagnosed by the presence of two vertically elongated humeral blotches, absence of a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: New species; Sexual dimorphism; Coastal drainages; Characidae.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200007
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Autoecology of Dryadosaura nordestina (Squamata: Gymnophthalmidae) from Atlantic forest fragments in Northeastern Brazil Rev. Bras. Zool.
Garda,Adrian A.; Medeiros,Pedro H.S. de; Lion,Marília B.; Brito,Marcos R.M. de; Vieira,Gustavo H.C.; Mesquita,Daniel O..
Life history parameters such as diet, reproduction, and sexual dimorphism are crucial to understand ecological and evolutionary forces shaping species traits. Nevertheless, such information is scant in the literature for most Neotropical squamates. Gymnophthalmidae contains over 242 species in 46 genera and includes small-size, mostly terrestrial species, although psamophilic, semi-aquatic, and low vegetation dwellers also occur. Dryadosaura is a monospecific genus - Dryadosaura nordestina Rodrigues et al., 2005 - , occurring in Atlantic Forest areas from Rio Grande do Norte to Northern Bahia, and little is known about its ecology and natural history. We analyzed the species' diet, reproduction, and sexual dimorphism based on 170 specimens deposited in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diet; Ecology; Lizard; Reproduction; Sexual dimorphism.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000500002
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Bilateral Variations and Sexual Dimorphism in Morphometric Parameters of Infraorbital Groove, Canal and Foramen in Human Foetuses International Journal of Morphology
Ghaus,Farah; Faruqi,N. A.
Foetal anatomy seems to be highly promising developing speciality in the recent past. Maxilla is the key to facial skeleton. Its anatomy in general and bilateral variations along with sexual dimorphism in particular are of great surgical and forensic importance.Thirty two maxillae of sixteen human foetuses (21 wks to 34 wks) were considered to measure lengths of infraorbital groove and canal, widths of ends of infraorbital groove, diameters of infraorbital foramen and the distances of latter from infraorbital margin and nasal notch. Groups I (21-25 wks) and II (26-30 wks) foetuses were crucial for bilateral variations for most of the parameters. Distance between infraorbital foramen and nasal notch showed variations on two sides in maximum foetal groups....
Tipo: Journal article Palavras-chave: Bilateral variation; Sexual dimorphism; Infraorbital groove; Infraorbital canal; Infraorbital foramen; Human foetuses.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200027
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Blind Test of Mandibular Morphology with Sex Indicator in Subadult Mandibles International Journal of Morphology
Suazo Galdames,Iván Claudio; Zavando Matamala,Daniela Alejandra; Smith,Ricardo Luiz.
Loth & Henneberg (2001) indicated that it was possible determine the sex with a high degree of accuracy (81 %) in mandibles of children by observing the shape of the mandibular body. The purpose of this study was to evalúate in mandibles of Brazilians subadults the proposed method consistency; were used mandibles of 33 Brazilian children between 0 and 1 year of age, known sex, belonging to the coUection of skulls of the Federal University Sao Paulo (UNIFESP). We performed a blind test in two sessions by one observer based on the parameters descnbed by Loth & Henneberg. The results show between 57.5 and 60.5% of accuracy, being the most sensitive test for determining male (70%) than for females (38-46%). The results presented are lower than...
Tipo: Journal article Palavras-chave: Sexual dimorphism; Determination of sex; Subadults; Mandible.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000400011
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Chrysobrycon eliasi, new species of stevardiine fish (Characiformes: Characidae) from the río Madre de Dios and upper río Manuripe basins, Peru Neotropical Ichthyology
Vanegas-Ríos,James Anyelo; Azpelicueta,María de las Mercedes; Ortega,Hernán.
Chrysobrycon eliasi is described from several drainages of río Madre de Dios and upper río Manuripe basins, río Madeira basin, Peru. The new species is distinguished from its congeners by the maxillary teeth, which are tricuspidate, bicuspidate and conical, and the terminal lateral-line tube developed between caudal-fin rays 10-11. Other characters that help to recognize C. eliasi are the possession of maxilla with 6-15 (usually 11) teeth occupying more than 70% of the length of the maxilla in adults, predorsal scales 18-22, dorsal-fin to hypural complex length 36.32-41.17% of standard length (SL), gill-gland length in males 3.57-5.05% SL, maxillary length 33.76-38.75% of head length, and branched anal-fin rays 24-30. The discovery of C. eliasi allows us...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Madeira basin; Pouch scale; Sexual dimorphism; Tambopata; Xenurobryconini.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400004
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Chrysobrycon yoliae, a new species of stevardiin (Characiformes: Characidae) from the Ucayali basin, Peru Neotropical Ichthyology
Vanegas-Ríos,James Anyelo; Azpelicueta,María de las Mercedes; Ortega,Hernán.
Chrysobrycon yoliae, new species, is described from a drainage flowing into the río Yucamia basin, río Ucayali basin, Peru. Chrysobrycon yoliaeis readily distinguished from its congeners by the anterior tip of pelvic bone situated anterior to the fifth rib (vs. situated posterior to the fifth rib), the presence of 20-26 dentary teeth (vs. 11-19), and the possession of a terminal lateral-line tube between caudal-fin rays 10 and 11 (vs. the absence of this tube, except in C. eliasi). The new species differs from C. eliasiand C. myersiby the presence of teeth on third pharyngobranchial (vs. the absence of teeth on this bone) and also differs from C. eliasiby the dorsal-fin origin situated at vertical through anal-fin rays 5 to 7 (vs. located at vertical...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Xenurobryconini; Pit organs; Amazon basin; Pouch scale; Sexual dimorphism.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200291
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Condition factor of Goniopsis cruentata (Crustacea, Brachyura, Grapsidae) from Mundaú/Manguaba estuarine complex, Alagoas, Brazil Iheringia, Sér. Zool.
Lira,José J. P. R.; Calado,Tereza C. S.; Araújo,Marina S. L. C..
The condition factor is a parameter which acts as a general indicator of the "well-being" of a species, and it can be obtained through the analysis of width vs. weight relationships. The present work aims to investigate size vs. weight relationship and the condition factor of the crab Goniopsis cruentata (Latreille, 1803). The study area was the Mundaú/Manguaba estuarine complex, Maceió, state of Alagoas, Northeast Brazil. Samplings were monthly accomplished from August 2007 to July 2008. A total of 626 individuals were analyzed, being 309 males and 317 females. Males were larger and heavier than females, what is expected in many brachyuran. The growth was positive allometric to both males (b = 3.42) and females (b = 3.30), not obeying the "cube law". The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crab; Growth; Sexual dimorphism; Mangrove forest; Northeast Brazil.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000300006
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Corpus Callosum Size, is There a Sexual Difference? International Journal of Morphology
Yasin,Mohammad; Farahani,Reza Mastery.
Physical anthropometry is a subdivision of human anatomy science, which has uses in medical industries. A lot of studies showed that genetic, racial, and socioeconomic factors and educational background play rule in anthropometry. We aim this study to determine the presence of differences between gender and corpus callosum size. MRIs were collected from Ardebil and Kermanshah states done in 2013, the participants were informed about this study. They were selected based on age more than 20-years old, absence of demyelization and degenerative diseases, clean history of for neurosurgery, and previous cerebrovascular accidents. MRIs were analyzed by PmsDview program in the midsagittal section by using 9 landmarks, and the data was analyzed by SPSS 19.0. The...
Tipo: Journal article Palavras-chave: Corpus callosum; Sex-related size; Sex-related; Anthropometry; Iran; MRI; Sexual dimorphism.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100016
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Cranial Osteology of the Armadillo Chaetophractus villosus (Mammalia, Xenarthra, Dasypodidae) International Journal of Morphology
Squarcia,Silvia Margarita; Sidorkewicj,Nora Silvia; Casanave,Emma Beatriz.
The morphology and morphometry of the cranial bones of Chaetophractus villosus were studied. The skull components are morphologically similar between adults of both sexes, and follow the generalized pattern for most of described dasypodids. The morphometric analysis, however, demonstrated that the bones lying in the rostrocaudal plane are mostly longest in females, determining higher values of the total, basal and condilobasal lengths of the skull, which are the main variables that contribute to a sexual dimorphism in this species
Tipo: Journal article Palavras-chave: Dasypodidae; Morphology; Osteology; Skull; Sexual dimorphism.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000500004
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Cranial sexual discrimination in hatchling broad-snouted caiman (Caiman latirostris) Iheringia, Sér. Zool.
Piña,Carlos; Larriera,Alejandro; Siroski,Pablo; Verdade,Luciano M..
Broad-snouted caiman (Caiman latirostris) hatchlings present a consistent sexual dimorphism in their cranium shape and size. Male hatchlings have smaller crania than females. Using multivariate statistical analyses it is possible to discriminate sex in broad-snouted caiman hatchlings by their cranial shape with a reasonable efficiency. The understanding of sexual dimorphism of crocodilian hatchlings might be possibly improved by experimental approach considering, genetic and phenotypic variables such as incubation temperature and clutch of origin.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caiman latirostris; Crocodilians; Hatchlings; Morphometrics; Sexual dimorphism.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212007000100003
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Determining sexual dimorphism in frog measurement data: integration of statistical significance, measurement error, effect size and biological significance Anais da ABC (AABC)
Hayek,Lee-Ann C.; Heyer,W. Ronald.
Several analytic techniques have been used to determine sexual dimorphism in vertebrate morphological measurement data with no emergent consensus on which technique is superior. A further confounding problem for frog data is the existence of considerable measurement error. To determine dimorphism, we examine a single hypothesis (Ho = equal means) for two groups (females and males). We demonstrate that frog measurement data meet assumptions for clearly defined statistical hypothesis testing with statistical linear models rather than those of exploratory multivariate techniques such as principal components, correlation or correspondence analysis. In order to distinguish biological from statistical significance of hypotheses, we propose a new protocol that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Statistics; Sexual dimorphism; Measurement error index; Effect size; Frogs.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100005
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