Ontogeny, phylogeny, and systematics of recent species of the superfamily Soritoidea Ehrenberg, 1839.
Item
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Title
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Ontogeny, phylogeny, and systematics of recent species of the superfamily Soritoidea Ehrenberg, 1839.
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Identifier
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AAI9020765
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identifier
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9020765
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Creator
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Gudmundsson, Gudmundur.
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Contributor
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Adviser: John J. Lee
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Biology, General | Biology, Zoology | Paleontology
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Abstract
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A classification and phylogenetic relationship of 18 species of the superfamily Soritoidea (Foraminifera) was established and one new species erected, Marginopora kudakajimensis. Thirty homologies were recognized which defined 16 groups as monophyletic, where 15 of these 16 groups could all be represented as branching points in a single diagram. The significance of this congruent data set is that it is consistent with the assumption that these homologous features originated in a common ancestor and were inherited in all of its descendant species. It was estimated that the probability of obtaining such results by chance alone was (14/304745){dollar}\sp{lcub}27{rcub}{dollar}, practically a zero probability. Chance was defined in this context to signify the combined outcome of three different processes: (1) unique origin and inheritance of the homologues, (2) elimination or loss, and (3) convergence.;The ontogenetic change of all the homologies was documented. Twenty-eight homologies were found to form a part of 6 different ontogenetic sequences. These sequences behave according to 3 general modes: transformation, divergence, and the combination of several unrelated ontogenies. Information on the ontogenetic succession of forms, was used to predict a definite sequence of fossils which is expected to exist in the sediments. This prediction was based on a reformulation of the famous thesis of parallelism or the biogenetic law.;The thesis was tested, that the morphological evolution of the soritids was driven by symbiotic relationships. The distribution of different types of symbionts is confined to the same species groups as are defined by a few homologies, which is consistent with the symbiosis thesis.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
