£72.99
£72.99
A major foraminifer diversification began in the Late Ordovician with multilocular tests. Their evolution saw walls change from agglutinated particles to microcrystalline calcite, leading to the major diversifications of the Mesozoic and Cenozoic Eras.
A major diversification of the foraminifers began in the Late Ordovician times with the development of multilocular tests in which the chambers are aligned along a straight growth axis. Most of the taxa within this group present a test wall consisting of agglutinated particles bounded by cement of organic or inorganic nature. In rare cases, some of the living taxa present a reduced mineral component of the wall, which became organic-dominated or organic. A different wall composition, namely of microcrystalline calcite, evolved in the Late Pennsylvanian and the new group ultimately led to the major diversifications of the Mesozoic and Cenozoic Eras. The growth axis of the taxa of the diversification that started in the Late Ordovician presents considerable changes through time, but in most cases is trochospiral, planispiral or a combination of the two. A test architecture in which the chambers are alternately added relative to the growth axis was iteratively developed multiple times in the group’s history. The diversification is also apparent in the development of tests in which the chamber interior is subdivided by partitions and a wall with a complex ultrastructure, mostly alveolar and rarely perforated.
The approach on which the content of this book is based is the classical evolutionary method, in which the ancestor-descendant relationships between the different taxa are inferred through a mixture of morphological resemblances given by the common ancestry and differences resulting from the divergent nature of the evolutionary process. This approach is applied to the vast fossil record of the foraminifers, small-sized and mostly microscopical single-celled organisms. The approach was tested in more than one hundred articles and books in the past, starting in 1932, and is a standard in current professional practice worldwide.
This book is intended for specialists in paleontology, biology and genetics, and also graduate students in the same sciences.
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