Form and formation of flares and parabolae based on new observations of the internal shell structure in lytoceratid and perisphinctid ammonoids

Form and formation of flares and parabolae based on new observations of the internal shell structure in lytoceratid and perisphinctid ammonoids

The ultrastructure of pristine shells of Jurassic and Cretaceous lytoceratid and perisphinctid ammonoids indicates that flares and parabolae represent homologous structures. Both mark an interruption of shell growth. We dismiss earlier interpretations of parabolae as actual aperture, relics of resor...

Bibliografski detalji
Glavni autori:	Gregor Radtke, René Hoffmann, Helmut Keupp
Format:	Članak
Jezik:	English
Izdano:	Institute of Paleobiology PAS 2016-08-01
Serija:	Acta Palaeontologica Polonica
Teme:	Ammonoidea ultrastructure megastriae temporary aperture episodic growth Jurassic Cretaceous
Online pristup:	http://www.app.pan.pl/archive/published/app61/app001542015.pdf

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