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Halacaridae Murray, 1877 (Actinedida, Acari)
(continuação) ancoram vários músculos viscerais. Além disso, junto à abertira da glândula, foi encontrado um sensilo. É possível que o papel primário da estrutura não seja a secreção e sim o ancoramento de músculos viscerais que controlam a pressão hidrostática da hemolinfa. Foram obtidas ainda micrografias dos espermatozóides de duas espécies, C. tupinamborum e Acaromantis vespucioi. O primeiro apresenta uma série de características plesiomórficas como a presença de um complexo acrossomal bem desenvolvido, formato oval e vesículas junto à membrana plasmática, enquanto o segundo é claramente derivado, com a perda do complexo acrossomal, redução da complexidade estrutural das secreções acompanhantes, ausência de vesículas ou invaginações da mebrana e formato fusiforme. Ainda que a interpretação das informações obtidas seja dificultada pelas lacunas existentes no conhecimento do grupo, as novas informações morfológicas, tendem a colocar os halacarídeos como grupo basal entre os prostigmatas.
CBM
None
Classification, Evolution, and the Nature of Biology
Historically, naturalists who proposed theories of evolution, including Darwin and Wallace, did so in order to explain the apparent relationship of natural classification. This book begins by exploring the intimate historical relationship between patterns of classification and patterns of phylogeny. However, it is a circular argument to use the data for classification. Alec Panchen presents other evidence for evolution in the form of a historically based but rigorously logical argument. This is followed by a history of methods of classification and phylogeny reconstruction including current mathematical and molecular techniques. The author makes the important claim that if the hierarchical p...
Algorithms in Bioinformatics
This book constitutes the refereed proceedings of the Third International Workshop on Algorithms in Bioinformatics, WABI 2003, held in Budapest, Hungary, in September 2003. The 36 revised full papers presented were carefully reviewed and selected from 78 submissions. The papers are organized in topical sections on comparative genomics, database searching, gene finding and expression, genome mapping, pattern and motif discovery, phylogenetic analysis, polymorphism, protein structure, sequence alignment, and string algorithms.
Understanding Marine Biodiversity
The diversity of marine life is being affected dramatically by fishery operations, chemical pollution and eutrophication, alteration of physical habitat, exotic species invasion, and effects of other human activities. Effective solutions will require an expanded understanding of the patterns and processes that control the diversity of life in the sea. Understanding Marine Biodiversity outlines the current state of our knowledge, and propose research agenda on marine biological diversity. This agenda represents a fundamental change in studying the oceanâ€"emphasizing regional research across a range of space and time scales, enhancing the interface between taxonomy and ecology, and linking...
Evolution and Diversity of Sex Ratio
Darwin first raised the question of sex ratio evolution, and saw it as both important and enigmatic. He was, however, unable to make much headway with the problem and declared it a puzzle for the future. This particular future arrived about 60 years later, when R. A. Fisher (1930) pointed out that under autosomal inheritance half of the genes passed to zygotes in any generation come from males and half come from females. Fisher noted that this one-mother/one-father symmetry generates frequency dependent natural selection on sex ratio, resulting in an evolutionary equi librium in which half of the reproductive resources are devoted to daughters and half to sons. Although widespread interest in sex ratio as a phenotypic trait did not occur for another 30 years, it is difficult for us to overestimate the impor tance of Fisher's brief and characteristically cryptic remarks. Almost all of the innovations in thinking about sex ratio can be viewed as alterations of one or more implicit assumptions in Fisher's scheme. The present book on insect sex ratios is testimony to the fruitfulness of his original ideas and of their descendants.
