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Registros recuperados: 9
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A new genus and species of characid fish from the Amazon basin: the recognition of a relictual lineage of characid fishes (Ostariophysi: Cheirodontinae: Cheirodontini) Neotropical Ichthyology
Bührnheim,Cristina M.; Carvalho,Tiago P.; Malabarba,Luiz R.; Weitzman,Stanley H..
Amazonspinther dalmata, a new miniature characid from the streams of rio Purus and rio Madeira, right bank tributaries of the rio Amazonas, is described as a new genus and species of the subfamily Cheirodontinae. The unique characters of the new genus and species are the three remarkable black blotches on the base of the dorsal, anal, and caudal fins, the anteriormost proximal radial of the anal fin with an anteriorly extended lamina entering the abdominal cavity, and the extremely elongate caudal peduncle. The reduced number of ventral procurrent caudal-fin rays (7-9), and the hemal spines of only posterior one, two, or sometimes three caudal vertebrae directly articulating with the ventral procurrent caudal-fin rays further diagnoses the new taxon from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phylogeny; Biogeography; Miniaturization; Spintherobolus; Priocharax.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400016
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A systematic review of diapoma (teleostei: characiformes: characidae: stevardiinae: diapomini) with descriptions of two new species from southern Brazil Pap. Avulsos de Zool. (São Paulo)
Menezes,Naércio A.; Weitzman,Stanley H..
Diapoma is reviewed and four species are recognized: (1) Diapoma thauma, new species, from streams of the rio Jacuí basin, state of Rio Grande do Sul; (2) D. pyrrhopteryx, new species collected from the rio Canoas and streams flowing into this basin in the states of Rio Grande do Sul and Santa Catarina, Brazil; (3) Diapoma terofali, from streams flowing into rio Uruguay in Uruguay and Rio Grande do Sul, Brazil and streams flowing into rio de la Plata, Argentina; and (4) Diapoma speculiferum, from lowland coastal streams in Rio Grande do Sul, Brazil and Uruguay. Diapoma pyrrhopteryx possess the posteroventral opercular elongation typical of D. speculiferum, type species of the genus, but which is absent in D. thauma and D. terofali. Nonetheless, all the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Taxonomy; New species; Characidae; Diapoma.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011000500001
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Comparison of spermiogenesis in the externally fertilizing Hemigrammus erythrozonus and the inseminating Corynopoma riisei (Teleostei: Characiformes: Characidae) Neotropical Ichthyology
Pecio,Anna; Burns,John R.; Weitzman,Stanley H..
Spermiogenesis and sperm ultrastructure were analyzed in two species of characids with different modes of fertilization: externally fertilizing Hemigrammus erythrozonus and inseminating Corynopoma riisei. Spermiogenesis in H. erythrozonus is characterized by lateral development of the flagellum, nuclear rotation, formation of a shallow nuclear fossa, condensation of the chromatin by elimination of the electron-lucent area from the peripheral region of the nucleus, and renewal of the nuclear membrane. Multilammelated membrane and multivesicular bodies were also observed during elimination of the excess cytoplasm. The spermatozoon exhibits characters typical of "aquasperm," i.e. a spherical head containing a spherical nucleus with highly condensed chromatin,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nuclear rotation; Aquasperm; Introsperm; Characids.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000400005
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Estado atual da sistemática dos peixes de água doce da América do Sul Acta Amazonica
Böhlke,James E.; Weitzman,Stanley H.; Menezes,Naercio A..
Resumo A fauna sul-americana de peixes de água doce, comparada com a do resto do mundo, é pouco conhecida. Há necessidade de coletas imediatas em muitas regiões, antes que os peixes se tornem raros ou se extingam. A fase descritiva da fauna de peixes de água doce da América do Sul desenvolveu-se em três períodos históricos. De 1750 até aproximadamente 1866, boa parte dos grandes exemplares de interesse comercial foi descrita por zoólogos europeus. De 1866 a 1930, caracterizou-se por descrições de espécies de grande e pequeno porte, por ictiólogos tanto europeus como norte-americanos. De 1930 ao presente, foi, em parte, um período em que surgiram descrições adicionais na América do Norte, Europa e América do Sul. De 30 a 40% da fauna de peixes de água doce...
Ano: 1978 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671978000400657
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George Sprague Myers (2/II/1905 - 4/XI/1985) Zoologia
Weitzman,Stanley H.; Menezes,Naércio A..
Tipo: Info:eu-repo/semantics/article
Ano: 1989 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751989000100019
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Hyphessobrycon melanopleurus uruguayensis Messner, 1962, an available name and a senior synonym of Cyanocharax macropinna Malabarba & Weitzman, 2003 (Ostariophysi: Characidae) Neotropical Ichthyology
Malabarba,Luiz R.; Weitzman,Stanley H.; Litz,Thomas.
Hyphessobrycon melanopleurus uruguayensis, Astyanacinus platensis, and Astyanax stenohalinus, published in a mimeographed paper by Messner in 1962 are considered available names. The subspecific name H. melanopleurus uruguayensis is recognized as a senior synonym of Cyanocharax macropinna Malabarba & Weitzman, 2003, and therefore referred to as Cyanocharax uruguayensis (Messner, 1962), new combination.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Astyanacinus platensis; Astyanax stenohalinus; Cyanocharax uruguayensis.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000200007
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Putative relationships among inseminating and externally fertilizing characids, with a description of a new genus and species of Brazilian inseminating fish bearing an anal-fin gland in males (Characiformes: Characidae) Neotropical Ichthyology
Weitzman,Stanley H.; Menezes,Naércio A.; Evers,Hans-Georg; Burns,John R..
A new inseminating fish species of the family Characidae, Bryconadenos tanaothoros, from tributaries of the upper rio Xingu and upper rio Tapajós basins, Mato Grosso, Brazil is described as the type species of a new genus. This new species and the genus are characterized by a glandular organ on the anterior region of the anal fin of sexually mature males, curved lower jaw teeth, and an inseminating reproductive mode. This new genus is hypothesized as most closely related to Attonitus, a genus with three inseminating species from Peru. Bryconadenos and Attonitus are suggested as related to certain inseminating, but undescribed characid species of uncertain relationships that are similar in certain respects to species of the glandulocaudine Planaltina and to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Inseminating characid phylogeny; Putative male pheromone cells; Attonitus; Bryconadenos; Knodus.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000300002
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Systematics of the neotropical fish subfamily Glandulocaudinae (Teleostei: Characiformes: Characidae) Neotropical Ichthyology
Menezes,Naércio A.; Weitzman,Stanley H..
The systematics of the Glandulocaudinae is reviewed in detail and justification for the recognition of the group as a subfamily is discussed. The subfamily Glandulocaudinae consists of three genera: Lophiobrycon with one species plesiomorphic in some anatomical features but some others exclusively derived relative to the species in the other genera; Glandulocauda with two species intermediate in phylogenetic derivation; and Mimagoniates with seven species (one new), all more phylogenetically derived concerning their pheromone producing caudal-fin organs and with other anatomical characters presumably more derived than in the species of the other genera. Glandulocauda melanogenys Eigenmann, 1911, is considered a junior synonym of Hyphessobrycon...
Tipo: Info:eu-repo/semantics/article Palavras-chave: South America; Lophiobrycon; Glandulocauda; Mimagoniates; Taxonomy; Biogeography.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300002
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Two new species and a review of the inseminating freshwater fish genus Monotocheirodon (Characiformes: Characidae) from Peru and Bolivia Pap. Avulsos de Zool. (São Paulo)
Menezes,Naércio A.; Weitzman,Stanley H.; Quagio-Grassiotto,Irani.
Two new species of inseminating freshwater fishes of the genus Monotocheirodon, family Characidae, are described from Peru. Males and females of both new species have an external, visually obvious urogenital papilla that was not detected in the females in previous studies, with this longer in males, which use it as an inseminating organ. A third inseminating species from Bolivia, Monotocheirodon pearsoni, unstudied in any detail since its original description in 1924, is redescribed. This latter species lacks an inseminating organ. Monotocheirodon is redescribed, its phylogenetic relationships are briefly discussed and it is suggested that it is possibly related to the stevardiin genera Ceratobranchia, Othonocheirodus, and Odontostoechus.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Inseminating characid fishes; New species and relationships of Monotocheirodon.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492013001000001
Registros recuperados: 9
Primeira ... 1 ... Última
 

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