The study of the umbilical system in planktonic foraminifera in relation with depth of the Abderaz Formation at type section, IRAN

Prospect of changes in such umbilical structures as Lip, Portici and Tegilla throughout Turonian-Campanian was also investigated. The phylogenic trend show that Lip structure in primary morphogroups turns gradually to tegilla in more developed forms in which the opening become also entirely umbilica...

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Bibliographic Details
Main Authors: Meysam Shafiee Ardestani, Ebrahim Ghasemi-Nejad
Format: Manuscript
Language:unknown
Published: 2009
Subjects:
Online Access:http://precedings.nature.com/documents/3206/version/1
http://hdl.handle.net/10101/npre.2009.3206.1
Description
Summary:Prospect of changes in such umbilical structures as Lip, Portici and Tegilla throughout Turonian-Campanian was also investigated. The phylogenic trend show that Lip structure in primary morphogroups turns gradually to tegilla in more developed forms in which the opening become also entirely umbilical. Statistical an analysis showed that the trends of changes are correlatable with increase in water depth while a decrease in depth result in development of lip in the planktonic foraminifera studied. The changes are considered to be in accord with Pascal law.