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Crystalline structure, orientation and nucleation of the nacreous tablets in the cephalopod Nautilus

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Crystalline structure, orientation and nucleation of the nacreous tablets in the cephalopod Nautilus

Content Provider	Springer Nature Link
Author	Mutvei, Harry Dunca, Elena
Copyright Year	2010
Abstract	The nacreous tablets in the Nautilus shell have similar crystalline structure as the tablets in the gastropod Gibbula shell. Etching with Mutvei’s solution reveals that each tablet is composed of vertical crystalline columns that are structurally similar to the acicular crystallites in the outer spherulitic-prismatic layer of the shell wall. The columns are attached to each other to form numerous vertical crystalline lamellae, oriented parallel to the longitudinal axis of the tablet. It is still unknown whether or not the orientation of the vertical lamellae corresponds to that of the crystallographic a- or b-axis. The orientation of the crystalline lamellae in the adjacent tablets is parallel in some nacreous laminae, but random in other laminae. Similar large variation was found in the nacreous tablets of the gastropod and bivalve shells. The nucleation sites of the nacreous tablets are predominantly situated on the peripheral portion of the upper surface of the preceding tablet, both in the shell wall and septa. The “aragonite-nucleating proteins” in the central portion of the crystal imprints of the organic interlamellar sheets, described by several writers, have therefore a negative correlation with the nucleation sites of the nacreous tablets. Die Perlmutt-Tafeln in der Schale von Nautilus haben eine ähnliche kristalline Struktur wie jene in der Schale der Gastropode Gibbula. Anätzung mit Mutvei-Lösung zeigt, dass jede Tafel aus vertikalen kristallinen Säulen besteht, die strukturell den nadelförmigen Kristallen in der äußeren spherulitisch-prismatischen Lage der Schale ähneln. Die Säulen sind miteinander verbunden und bilden so zahlreiche, vertikale kristalline Lamellen, die parallel zu der Längsachse der Tafel angeordnet sind. Es ist noch unbekannt, ob die Orientation der vertikalen Lamellen der kristallographischen a- oder b-Achse entspricht. Die Orientation der kristallinen Lamellen in angrenzenden Tafeln ist parallel in einigen Perlmutt-Tafeln, aber zufällig in anderen. Eine ähnliche Variation wurde bei den Perlmutt-Tafeln der Schalen von Gastropoden und Bivalven beobachtet. Der Ursprungspunkt der Perlmutt-Tafeln liegt überwiegend im randlichen Bereich der Oberfläche der vorhergehenden Tafel, sowohl in der Wand der Schale, als auch in den Septen. Die „Aragonit-Ursprungs-Proteine" im zentralen Bereich der kristallinen Abdrücke auf den organischen interlamellären Lagen, die von verschiedenen Autoren beschrieben wurden, zeigen somit eine negative Korrelation mit dem Ursprungsort der Perlmutt-Tafeln.
Starting Page	457
Ending Page	465
Page Count	9
File Format	PDF
ISSN	00310220
Journal	Paläontologische Zeitschrift
Volume Number	84
Issue Number	4
e-ISSN	18676812
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nautilus-Schale Perlmutt-Tafeln kristalline Struktur Kristallisations-Ursprung Paleontology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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