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...

Полное описание

Библиографические подробности
Главные авторы:	Gregor Radtke, René Hoffmann, Helmut Keupp
Формат:	Статья
Язык:	English
Опубликовано:	Institute of Paleobiology PAS 2016-08-01
Серии:	Acta Palaeontologica Polonica
Предметы:	Ammonoidea ultrastructure megastriae temporary aperture episodic growth Jurassic Cretaceous
Online-ссылка:	http://www.app.pan.pl/archive/published/app61/app001542015.pdf

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