Duas novas espécies de Polygala (Polygalaceae) da região da Chapada dos Veadeiros, GO, Brasil

Pastore, José Floriano Barêa; Marques, Maria do Carmo Mendes

doi:10.1590/s0102-33062009000200016

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…The Chapada dos Veadeiros region inserted in the Brazilian Cerrado, is one of the world's biodiversity hotspots (Myers et al, 2000;Silva & Bates, 2002;Klink & Machado, 2005), sheltering endemic species in Plantae (Irwin & Arroyo, 1973;Pastore & Cavalcante, 2008;Pastore & Marques, 2009), Trichoptera (Calor, 2008), Anura (Bockermann, 1975;Caramaschi & Cruz, 2000), Aves (Silva, 1997;Tubelis, 2009), and Mammalia (Bonvicino et al, 2005). The lack of recognition of endemic species leads to their exclusion/forgetfulness from lists of threatened species, and the consequent absence of efforts and funds for their conservation and of the ecoregions that harbor them.…”

Section: Discussionmentioning

confidence: 99%

Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination and Astyanax courensis, new species (Ostariophysi: Characiformes): two Characidae from the upper rio Tocantins basin, Central Brazil

2010

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Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination, is redescribed based on the type series and topotypes, and A. courensis, new species, is herein described. Both species were collected in the rio dos Couros basin, upper rio Tocantins basin, Chapada dos Veadeiros, Goiás State, Brazil. These species possess the characters and general body morphology of the species of the Astyanax scabripinnis species complex. The new combination of Astyanax goyanensis is supported by the absence of characters that define Astyanacinus. Astyanax goyanensis and A. courensis differ from their congeners by meristic and morphometric characters, and color pattern. Astyanax goyanensis has only seven pelvic-fin rays, an uncommon character in the species of this genus, and A. courensis possesses only three or four scale rows below the lateral-line, fewer than typical of the genus.Astyanax goyanensis (Miranda-Ribeiro, 1944), nova combinação, é redescrita com base na série-tipo e topótipos, e A. courensis, espécie nova, é descrita. Ambas espécies foram coletadas na bacia do rio dos Couros, bacia do alto rio Tocantins, Chapada dos Veadeiros, Goiás, Brasil. Estes táxons possuem os caracteres e morfologia do corpo das espécies do complexo Astyanax scabripinnis. A transferência e nova combinação de Astyanax goyanensis devem-se a ausência de caracteres que definem Astyanacinus. Astyanax goyanensis e A. courensis diferem das congêneres por caracteres merísticos, morfométricos e padrão de colorido. Astyanax goyanensis possui apenas sete raios na nadadeira pélvica, caráter incomum nas espécies do gênero, e A. courensis possui apenas três ou quatro séries de escamas abaixo da linha lateral, menos do que típico do gênero.

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Section: Discussionmentioning

confidence: 99%

Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination and Astyanax courensis, new species (Ostariophysi: Characiformes): two Characidae from the upper rio Tocantins basin, Central Brazil

2010

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“…The secretory structures have an important generic and specific contribution to the family, but knowledge on them is scarce and, often they are only referred to as present or absent (Aguiar and Aranha Filho 2008, Coelho et al 2008, Lüdtke and Aguiar 2008, Pastore and Marques 2009). Among these structures are the nodal extrafloral nectaries (EFNs) which are specialized glands or tissues that secrete nectar and are found on the vegetative portions of many plant species, usually functioning as a defensive mechanism against herbivores (Fahn 1979, Barônio 2012).…”

Section: Introductionmentioning

confidence: 99%

Morphology, ontogeny and structure of the stipular nectaries in Caamembeca spectabilis (Polygalaceae)

2016

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Nodal glands are found in one third of the Polygalaceae genera and have valuable taxonomic, ecological and evolutionary significance. In Brazil, they occur in five of the eleven genera already registered. However, there is still a controversy regarding the origin of these structures. The objective of this study was to characterize the morphology and the origin of nodal glands in Caamembeca spectabilis, in order to increase the structural and functional knowledge of these glands in the genera. Samples of nodal regions were collected, fixed and processed according to the methods of light microscopy and electron scanning. Ants were observed and identified along the stem axis. The glucose in exudate allows us to classify these glands as extrafloral nectaries. They are located in pairs on the nodal region. However, its origin is in the leaf trace. In the longitudinal section, the nectaries were present in the apex of cells with anticlinal walls impregnated with suberin, which represents the first record for the family. In this region there is also the formation of a hole by lysis. The secretory tissue is surrounded by phloem. Xylem vessels were observed only on the basis of the nectary, where there are also idioblasts with crystals in druse type. We have studied the ontogeny of the glands nodal in Caamembeca spectabilis and unveiled that these glands are linked to the leaves as stipular nectaries. In addition, the new findings presented here may add support for the understanding of morphology and anatomy of nodal glands in Caamembeca. KEYWORDS: Fabales, extrafloral nectaries, vascularization, suberin, ants. Morfologia, ontogenia e estrutura dos nectários estipulares em Caamembeca spectabilis (Polygalaceae) RESUMOGlândulas nodais são encontradas em um terço dos gêneros de Polygalaceae e possuem grande importância taxonômica, ecológica e evolutiva. No Brasil, ocorrem em cinco, dos onze gêneros já registrados. Contudo, ainda há controvérsias quanto à origem dessas estruturas. O objetivo deste trabalho foi caracterizar a morfologia e a origem das glândulas nodais em Caamembeca spectabilis, visando ampliar o conhecimento estrutural e funcional dessas glândulas no gênero. Amostras das regiões nodais foram coletadas, fixadas e processadas segundo os métodos em microscopia de luz e eletrônica de varredura. Formigas foram observadas e identificadas ao longo do eixo caulinar. A glicose no exsudato permite tratar as glândulas como nectários extraflorais. Esses estão localizados aos pares na região nodal. Porém, sua origem ocorre no traço foliar. Os nectários, em secção longitudinal, apresentam as células do ápice com paredes anticlinais impregnadas com suberina, sendo este o primeiro registro para a família. Nessa região também ocorre a formação de um orifício por lise. O tecido secretor do nectário é circundado pelo floema. Vasos de xilema foram observados apenas na base do nectário, onde também ocorrem idioblastos com cristais do tipo drusas. Dessa forma, este estudo confirma a trajetória ontogenética das glândulas no...

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Polygala judithea (Polygalaceae), a new species from Chapada dos Veadeiros, Goiás, Brazil

Pastore

2013

Kew Bull

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Duas novas espécies de Polygala (Polygalaceae) da região da Chapada dos Veadeiros, GO, Brasil

Cited by 5 publications

References 4 publications

Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination and Astyanax courensis, new species (Ostariophysi: Characiformes): two Characidae from the upper rio Tocantins basin, Central Brazil

Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination and Astyanax courensis, new species (Ostariophysi: Characiformes): two Characidae from the upper rio Tocantins basin, Central Brazil

Morphology, ontogeny and structure of the stipular nectaries in Caamembeca spectabilis (Polygalaceae)

Polygala judithea (Polygalaceae), a new species from Chapada dos Veadeiros, Goiás, Brazil

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