NDLI: The hydrodynamic significance of the graptoloid nema in scandent graptoloids

Content Provider	Springer Nature Link
Author	Rantell, Lesley Rigby, Susan
Copyright Year	2002
Abstract	Experiments show that the nema, cauda and virgula had a profound effect on the orientation of scandent graptoloids, acting as trailing stabilisers and enforcing a stable orientation on the rest of the colony. Scandent graptolites with a well developed nema would have encountered water currents sicula first and would have responded to changing current orientation with a rapid change in their own orientation. The efficiency of the nema, cauda or virgula was dependent on its length and width relative to that of the rhabdosome. In general, longer, wider structures had a more pronounced effect on orientation at the expense of a slower response time to changing current orientations. Virgula structures such as vanes and trailing threads may have offered a means of overcoming this compromise, offering a strong orientational control and a rapid response time.
Starting Page	131
Ending Page	140
Page Count	10
File Format	PDF
ISSN	00372110
Journal	Palaeobiodiversity and Palaeoenvironments
Volume Number	82
Issue Number	1
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	graptolites hydrodynamics lower Palaeozoic Paleontology Biodiversity Animal Systematics/Taxonomy/Biogeography Plant Systematics/Taxonomy/Biogeography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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The hydrodynamic significance of the graptoloid nema in scandent graptoloids