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Antonio G. Checa (1,2), Fatima Linares (3), Christian Grenier (1), Erika Griesshaber (4), Alejandro B. Rodrıguez-Navarro (5), Wolfgang W. Schmahl (4)
iScience, 24, Issue 11, November 2021. DOI: 10.1016/j.isci.2021.103288
The shell of the cephalopod Argonauta consists of two layers of fibers that elongate perpendicular to the shell surfaces. Fibers have a high-Mg calcitic core sheathed by thin organic membranes (>100 nm) and configurate a polygonal network in cross section. Their evolution has been studied by serial sectioning with electron microscopy-associated techniques. During growth, fibers with small cross-sectional areas shrink, whereas those with large sections widen. It is proposed that fibers evolve as an emulsion between the fluid precursors of both the mineral and organic phases. When polygons reach big cross-sectional areas, they become subdivided by new membranes. To explain both the continuation of the pattern and the subdivision process, the living cells from the mineralizing tissue must perform contact recognition of the previously formed pattern and subsequent secretion at sub-micron scale. Accordingly, the fabrication of the argonaut shell proceeds by physical self-organization together with direct cellular activity.
Dragonfly was used to do videos, segmentations and 3D meshes.
(1) Departamento de Estratigrafía y Paleontología, Universidad de Granada, 18071 Granada, Spain.
(2) Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, 18100 Armilla, Spain.
(3) Centro de Instrumentación Científica, Universidad de Granada, 18071 Granada, Spain.
(4) Department für Geo- und Umweltwissenschaften, Ludwig-Maximilians-Universität München, 80333 München, Germany.
(5) Departamento de Mineralogía y Petrología, Universidad de Granada, 18071 Granada, Spain.
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