Cameral deposits in a sublethally damaged Pennsylvanian Pseudorthoceras sp. from the Buckhorn Asphalt Lagerstätte in Oklahoma, USA

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Details zur Publikation

Autorinnen und Autoren: Seuß B, Mapes RH, Klug C
Jahr der Veröffentlichung: 2010


Abstract

The recovery of two
well-preserved chambers of the phragmocone of Pseudorthoceras sp. from
the Buckhorn Asphalt Lagerstätte provides nw insight into the
controversy over how cameral deposits are developed in orthoconic
nautiloids. The specimen has two oval openings in the conch, a result of
penetrating the outer test and present cameral deposits. The animan
survived the attack and was able to still precipitate cameral deposits,
astonishing because in the orad chamber the bite-marks opened the
chamber to the seawater. Three hypotheses of cameral deposit
precipitation can be tested: (1) direct precipitation from the cameral
fluid; (2) precipitation from the cameral fluid with a reoccurring
organic template/membrane; (3) secretion by a cameral tissue. (1) and
(2) cannot be supported because the precipitation chemistry of the
cameral fluid is altered and cannot be controlled by the animal. (3)
remains possible: the penetration marks would be sealed by cameral
tissue regeneration and cameral deposits would be precipitated directly
by such tissue. Thus, the cameral fluid chemistry would appear not to be
important for cameral deposit precipitation. Anyhow, this hypothesis
remains problematic: there are no known openings that would allow
tissure connections from the siphuncle through the connecting ring to
the cameral deposits.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Seuß, Barbara Dr.
Lehrstuhl für Paläoumwelt


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Universität Zürich (UZH)

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