Genetically controlled cortical tissue deposition inNormalograptus scalaris (Hisinger, 1837) |
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| Authors: | Jörg Maletz |
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| Institution: | (1) Department of Geology, University at Buffalo, State University of New York, 772 Natural Sciences and Mathematics Complex, 14260-3050 Buffalo, New York, U.S.A. |
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| Abstract: | A specimen ofNormalograptus scalaris (Hisinger) from the Llandovery of Dalarna, Sweden, shows a highly asymmetrical rhabdosome in which one stipe was abandoned at an early
stage in the growth of the colony. The surface of the rhabdosome is thickly covered by cortical tissue, but the remaining
dorsal side of the second stipe is left free. Even though the symmetry of the colony is strongly distorted, it survived for
a considerable time. It is suggested that this unusual development involved genetic control of cortical tissue deposition
in the graptolite colony.
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| Keywords: | Silurian graptolites growth hydrodynamics cortical tissue genetic control |
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