منابع مشابه
A Reappraisal of the North American Species of the Siluro-devonian Trilobite Genus Scotiella
The type material of Scotiella Delo 1935 is redescribed and the generic diagnosis emended to include trilobites in which the anterior and median lateral glabellar furrows are both strongly and poorly defined. The genus now embraces the species Scotiella logani (Hall 1860), S. conservatrix (McLearn 1924) new combination, S. minor (M'Coy 1851), S. samsonowiczi Tomczykowa 1962b and S. opatowiensis...
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My goal in this presentation will be to explore the impact the discoveries of modern molecular biology have had on our understanding of the history of life on earth. I will demonstrate using a fundamental assumption of evolutionary theory, that we can know in exquisite detail, the molecular biology of one of the earliest form of metazoan life for which we have a consonant record, the Trilobite....
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Energy saving mechanisms in nature allow following organisms to expend less energy than leaders. Queues, or ordered rows of individuals, may form when organisms exploit the available energy saving mechanism while travelling at near-maximal sustainable metabolic capacities; compact clusters form when group members travel well below maximal sustainable metabolic capacities. The group size range, ...
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Modularity of the cranidium of Crassifimbra? metalaspis, a Cambrian ptychoparioid trilobite, is investigated using landmark-based geometric morphometric methods to gain insight into the integration among morphogenetic processes responsible for shaping the head of an ancient arthropod. Of particular interest is the extent to which the structure of phenotypic integration was governed by direct in...
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The good fossil record of trilobite exoskeletal anatomy and ontogeny, coupled with information on their nonbiomineralized tissues, permits analysis of how the trilobite body was organized and developed, and the various evolutionary modifications of such patterning within the group. In several respects trilobite development and form appears comparable with that which may have characterized the a...
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ژورنال
عنوان ژورنال: Proceedings of the Japan Academy
سال: 1975
ISSN: 0021-4280
DOI: 10.2183/pjab1945.51.447