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| Huaquín,Laura G.; Veliz,Dina; Arratia,Gloria. |
| El conocimiento de la estructura ovárica permite analizar la capacidad desovante, duración, temporalidad y forma en que se realiza esta función reproductiva. Se describen y analizan aspectos estructurales de las cubiertas ovocitarias de 2 especies de Siluriformes Nematogenys inermis especie considerada en peligro de extinción y de Trichomycterus areolatus, la más abundante y de mayor distribución en Chile continental. Cortes histológicos de 6 mm de ovarios fijados en Bouin fueron teñidos con HE, Azán, Van Gieson, Alcian Blue y PAS. El estudio histológico muestra la pared del ovario formada por el peritoneo externo, una túnica media y el epitelio ovárico. Desde la túnica se proyectan hacia el interior, láminas de tejido conectivo que van a constituir el... |
| Tipo: Journal article |
Palavras-chave: Histología; Cubiertas ovocitos; Siluriformes. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200026 |
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| Arratia,Gloria; Quezada-Romegialli,Claudio. |
| ABSTRACT A study including morphological characters and mitogenomics of South American and Australian fishes previously assigned to Percichthyidae was conducted. Results generated from these different data sets reveal major disagreements concerning the content and interpretation of the so-called percichthyids. A phylogenetic analysis based on 54 morphological characters suggests the existence of two major clades: (1) Percichthyidae, including the South American Percichthys and the Australian taxa Macquaria australasica, Macquaria (= Plectroplites), and Maccullochella; (2) Perciliidae with the South American genus Percilia at the base plus more advanced Australian genera Nannoperca, Nannatherina, Bostockia, and Gadopsis. In contrast, molecular and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogeography; Endemism; Morphology; Phylogeny; Taxonomy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100301 |
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| Arratia,Gloria. |
| ABSTRACT A morphological revision is presented here on the cohort Otomorpha, a clade currently interpreted as the most primitive among the large supercohort Clupeocephala. Otomorpha is a morphologically heterogeneous group represented by clupei forms , alepocephaliforms, and ostariophysans (gonorynchiforms, cypriniforms, characiforms, siluriforms, and gymnoti forms) that inhabit various marine and freshwater environments worldwide. Otomorphs have a long (ca. 145 Ma) and diverse fossil record. They are the largest fish teleostean clade worldwide, as well as the largest of the Neotropical Region. While molecular studies strongly confirm the monophyly of Otomorpha, most potential morphological synapomorphies of the group become homoplastic largely due to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alepocephaloids; Clupeomorphs; Morphology; Ostariophysans; Synapomorphies. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000300305 |
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