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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Taxonomia e análise cladística de Cochabamba Bechyné, 1955 (Coleoptera, Chrysomelidae, Galerucinae) / Taxonomy and cladistic analysis of Cochabanba Bechyné, 1955 (Coleoptera, Chrysomelidae, Galerucinae)

Prado, Laura Rocha 20 October 2010 (has links)
O gênero Cochabamba Bechyné, 1955 é estritamente neotropical, com registros de ocorrência confirmados apenas para a América Central e América do Sul. O gênero faz parte do grupo dos Galerucinae diabroticinos, o qual inclui táxons muito estudados por sua importância econômica, mas que, apesar disso, tem a sistemática pouco resolvida. Realizou-se a revisão taxonômica e a análise cladística do gênero, uma vez que não existia nenhum estudo desta natureza para o grupo que incluía, até o presente trabalho,10 espécies. O estudo morfológico foi executado segundo protocolo tradicional, que inclui dissecção e ilustração dos espécimes (pelo menos um macho e uma fêmea de cada espécie, quando disponível). A análise cladística baseou-se em 15 terminais e 58 caracteres morfológicos (sendo 5 referentes à coloração, e 13 à genitália). Considerando a inexistência de informações filogenéticas para o gênero, os terminais do grupo externo foram selecionados dentre representanes da subfamília Galerucinae. A busca exaustiva com pesos iguais dos caracteres encontrou 13 árvores mais parcimoniosas (C=102), cujo consenso teve comprimento igual a 108 passos. A análise com pesagem sucessiva dos caracteres encontrou 3 árvores mais parcimoniosas (C= 102), cujo consenso teve comprimento igual a 103 passos (IC= 74, IR= 60). As topologias encontradas indicam que o gênero Cochabamba como configurado até o presente trabalho era merofilético. A monofilia de Cochabamba é recuperada com a transferência de C. volxemi para o gênero Paranapiacaba Bechyné, 1955 (combinação revalidada) e a inclusão de Diabrotica rufolimbata (nova combinação). Apresenta-se uma chave de identificação para as espécies de Cochabamba, além da redescrição de todas as espécies incluídas, bem como a descrição de uma espécie nova, o que resulta em 11 espécies. Apresentam-se, ainda, mapas indicando a distribuição geográfica do gênero, os quais foram confeccionados a partir de informações de localidade presentes nas etiquetas de cada exemplar examinado, além dos dados obtidos na literatura. / Cochabamba Bechyné, 1955 is a strictly neotropical genus, recorded only from Central and South America. This genus belongs to the Galerucinae diabroticines, a group which includes well studied taxa of economic importance, but has a poorly understood systematics. The present study provides the first revisional and cladistic treatment of this group, up to now composed by 10 species. The morphological study of all specimens followed the traditional methods of dissection and illustration of specimens (at least one male and female of every species, if available). The cladistic analysis was based on 15 terminal taxa and 58 morphological characters (including 5 referring to coloration and 13 to genitalia). Since there were no previous phylogenetic hypothesis for the relationships of this genus, the outgroups were selected among the representatives of the subfamily Galerucinae. The analysis using equally weighted characters produced 13 equally most-parcimonious trees (L=102), which resulted in a consensus diagram 108 steps long. The analysis conducted after sucessive weighting of characters found 3 most-parcimonious trees, which resulted in a consensus diagram 103 steps long (CI= 74; RI= 60). According to the observed topologies, Cochabamba as previously defined is a merophyletic group. To recover its monophyly, the taxon C. volxemi must be transferred back to genus Paranapiacaba Bechyné, 1955 (reinstated combination) and Diabrotica rufolimbata (new combination) included into the genus. An identification key to species is presented, as well as the redescription of all 11 Cochabamba species, including the description of a new species. Maps showing the geographic distribution of the species are also presented, based on the labels of studied material and data collected from literature.
2

Taxonomia e análise cladística de Cochabamba Bechyné, 1955 (Coleoptera, Chrysomelidae, Galerucinae) / Taxonomy and cladistic analysis of Cochabanba Bechyné, 1955 (Coleoptera, Chrysomelidae, Galerucinae)

Laura Rocha Prado 20 October 2010 (has links)
O gênero Cochabamba Bechyné, 1955 é estritamente neotropical, com registros de ocorrência confirmados apenas para a América Central e América do Sul. O gênero faz parte do grupo dos Galerucinae diabroticinos, o qual inclui táxons muito estudados por sua importância econômica, mas que, apesar disso, tem a sistemática pouco resolvida. Realizou-se a revisão taxonômica e a análise cladística do gênero, uma vez que não existia nenhum estudo desta natureza para o grupo que incluía, até o presente trabalho,10 espécies. O estudo morfológico foi executado segundo protocolo tradicional, que inclui dissecção e ilustração dos espécimes (pelo menos um macho e uma fêmea de cada espécie, quando disponível). A análise cladística baseou-se em 15 terminais e 58 caracteres morfológicos (sendo 5 referentes à coloração, e 13 à genitália). Considerando a inexistência de informações filogenéticas para o gênero, os terminais do grupo externo foram selecionados dentre representanes da subfamília Galerucinae. A busca exaustiva com pesos iguais dos caracteres encontrou 13 árvores mais parcimoniosas (C=102), cujo consenso teve comprimento igual a 108 passos. A análise com pesagem sucessiva dos caracteres encontrou 3 árvores mais parcimoniosas (C= 102), cujo consenso teve comprimento igual a 103 passos (IC= 74, IR= 60). As topologias encontradas indicam que o gênero Cochabamba como configurado até o presente trabalho era merofilético. A monofilia de Cochabamba é recuperada com a transferência de C. volxemi para o gênero Paranapiacaba Bechyné, 1955 (combinação revalidada) e a inclusão de Diabrotica rufolimbata (nova combinação). Apresenta-se uma chave de identificação para as espécies de Cochabamba, além da redescrição de todas as espécies incluídas, bem como a descrição de uma espécie nova, o que resulta em 11 espécies. Apresentam-se, ainda, mapas indicando a distribuição geográfica do gênero, os quais foram confeccionados a partir de informações de localidade presentes nas etiquetas de cada exemplar examinado, além dos dados obtidos na literatura. / Cochabamba Bechyné, 1955 is a strictly neotropical genus, recorded only from Central and South America. This genus belongs to the Galerucinae diabroticines, a group which includes well studied taxa of economic importance, but has a poorly understood systematics. The present study provides the first revisional and cladistic treatment of this group, up to now composed by 10 species. The morphological study of all specimens followed the traditional methods of dissection and illustration of specimens (at least one male and female of every species, if available). The cladistic analysis was based on 15 terminal taxa and 58 morphological characters (including 5 referring to coloration and 13 to genitalia). Since there were no previous phylogenetic hypothesis for the relationships of this genus, the outgroups were selected among the representatives of the subfamily Galerucinae. The analysis using equally weighted characters produced 13 equally most-parcimonious trees (L=102), which resulted in a consensus diagram 108 steps long. The analysis conducted after sucessive weighting of characters found 3 most-parcimonious trees, which resulted in a consensus diagram 103 steps long (CI= 74; RI= 60). According to the observed topologies, Cochabamba as previously defined is a merophyletic group. To recover its monophyly, the taxon C. volxemi must be transferred back to genus Paranapiacaba Bechyné, 1955 (reinstated combination) and Diabrotica rufolimbata (new combination) included into the genus. An identification key to species is presented, as well as the redescription of all 11 Cochabamba species, including the description of a new species. Maps showing the geographic distribution of the species are also presented, based on the labels of studied material and data collected from literature.
3

The Arthropod Assemblage of the Upper Devonian Strud locality and its Ecology

Lagebro, Linda January 2015 (has links)
The Devonian (419-359 million years ago) is the geological period when the terrestrial biota fully established. Early representatives from a terrestrial and continental aquatic biota have previously been reported from the Upper Devonian (Famennian) Strud quarry in Belgium, in the shape of seed-bearing plants and vertebrates (fish and early tetrapods). The palaeoenvironment is interpreted as a floodplain with slow accumulation of sediment in the river channels and adjacent shallow pools, subject to seasonal flooding and desiccation. This thesis presents the upper Famennian Strud ecosystem with representatives from the largest animal phylum – the Arthropoda. Pancrustaceans are dominating the arthropod assemblage by two eumalacostracans (previously described), three groups of branchiopods, and a putative insect, all collected in fine shales likely deposited in the shallow pools. The branchiopods from Strud comprise new members from all three extant clades, i.e. notostracans, anostracans, and spinicaudatan diplostracans. The notostracan Strudops goldenbergi is remarkable for its close resemblance with the extant genus Triops by the overall body plan and telson morphology. A phylogenetic analysis including modern and extinct notostracans and anostracans was performed, where Strudops appears as the earliest undisputed notostracan ever found. In addition, new genera of Anostraca (Haltinnaias serrata) and Spinicaudata (Gesvestheria pernegrei) are described herein. The insect Strudiella devonica consists of a single specimen and is interpreted to have been a nymph due to its minute size and wingless appearance. The chelicerates are represented by one or several species of eurypterids. So far unnamed juvenile eurypterid remains have also been found within the pool strata, and fragments of adult individuals in the coarser river deposits. The branchiopod community displays a unique insight to the ecosystem that these crustaceans inhabited. This is partly because of their co-occurrence, but mainly because they are preserved in close association to draught-resistant encysted eggs, in the same manner as modern day branchiopods do to survive and disperse during periods of drought and freezing. Altogether, the arthropod assemblage offers insight to Late Devonian freshwater ecosystems, and provides further understanding of the evolution of respective groups.
4

Bilaterale Koordination kommissuraler Interneurone im Mesothorakalganglion von Locusta migratoria migratorioides / Bilateral Coordination During Leg Movements by Commissural Interneurons in the Mesothoracic Ganglion of the Locust

Baldus, Marian 31 October 2008 (has links)
No description available.

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