Repository logo
 

Crystallographic control of the fabrication of an extremely sophisticated shell surface microornament in the glass scallop Catillopecten.

Published version
Peer-reviewed

Change log

Authors

Checa, Antonio G 
Salas, Carmen 
Varela-Feria, Francisco M 
Rodríguez-Navarro, Alejandro B 
Grenier, Christian 

Abstract

The external surface microornament of the glass scallops Catillopecten natalyae and malyutinae is made by calcitic spiny projections consisting of a stem that later divides into three equally spaced and inclined branches (here called aerials). C. natalyae contains larger and smaller aerials, whereas C. malyutinae only secreted aerials of the second type. A remarkable feature is that aerials within each type are fairly similar in size and shape and highly co-oriented, thus constituting a most sophisticated microornament. We demonstrate that aerials are single crystals whose morphology is strongly controlled by the crystallography, with the stem being parallel to the c-axis of calcite, and the branches extending along the edges of the {104} calcite rhombohedron. They grow epitaxially onto the foliated prisms of the outer shell layer. The co-orientation of the prisms explains that of the aerials. We have developed a model in which every aerial grows within a periostracal pouch. When this pouch reaches the growth margin, the mantle initiates the production of the aerial. Nevertheless, later growth of the aerial is remote, i.e. far from the contact with the mantle. We show how such an extremely sophisticated microornament has a morphology and co-orientation which are determined by crystal growth.

Description

Keywords

Animals, Bivalvia, Calcium Carbonate, Crystallization, Crystallography, Pectinidae

Journal Title

Sci Rep

Conference Name

Journal ISSN

2045-2322
2045-2322

Volume Title

Publisher

Springer Science and Business Media LLC
Sponsorship
Ministerio de Ciencia, Innovación y Universidades (CGL2017-85118-P, CGL2017-85118-P, CGL2017-85118-P, PID2020-116660GB-I00, CGL2017-85118-P, CGL2017-85118-P)
Universidad de Granada (UCE-PP2016-05, UCE-PP2016-05, UCE-PP2016-05)
Consejería de Economía, Innovación, Ciencia y Empleo, Junta de Andalucía (RNM363, RNM363)
Ministry of Science and Higher Education of the Russian Federation (13.1902.21.001)