منابع مشابه
The Trilobite: Enigma of Complexity
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....
متن کاملThe Evolution of Trilobite Body Patterning
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...
متن کاملTrilobite"pelotons": Possible hydrodynamic drag effects between leading and following trilobites in trilobite queues
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, ...
متن کاملModularity of a Cambrian ptychoparioid trilobite cranidium.
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...
متن کاملPseudophillipsia (Carniphillipsia) (Trilobite) from the Permian Jamal Formation, Isfahan, Iran
The aim of this study is to bridge a gap in the existence of Trilobites in the marine Permian successions of Iran by exploring a stratigraphic section of the Permian in Jamal Formation (Dizlu section). Based on comprehensive field studies and laboratory investigations three Trilobite specimens were identified in the study area including Pseudophillipsia (Carniphillipsia) dizluensis sp. nov., P...
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ژورنال
عنوان ژورنال: Psyche: A Journal of Entomology
سال: 1941
ISSN: 0033-2615,1687-7438
DOI: 10.1155/1941/98531