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| 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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| 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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| 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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| 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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| 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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| 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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| 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 |
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