@misc{10481/93439,
year = {2024},
month = {5},
url = {https://hdl.handle.net/10481/93439},
abstract = {Aplacophoran molluscs are shell-less and have a worm-like body which is covered by biomineralized sclerites. We investigated sclerite crystallography and the sclerite mosaic of the Solenogastres species Dorymenia sarsii, Anamenia gorgonophila, and Simrothiella margaritacea with electron-backscattered-diffraction (EBSD), laser-confocal-microscopy and FE-SEM imaging. The soft tissue of the molluscs is covered by spicule-shaped, aragonitic sclerites. These are sub-parallel to the soft body of the organism. We find, for all three species, that individual sclerites are untwinned aragonite single crystals. For individual sclerites, aragonite c-axis is parallel to the morphological, long axis of the sclerite. Aragonite a- and b-axes are perpendicular to sclerite aragonite c-axis. For the scleritomes of the investigated species we find different sclerite and aragonite crystal arrangement patterns. For the A. gorgonophila scleritome, sclerite assembly is disordered such that sclerites with their morphological, long axis (always the aragonite c-axis) are pointing in many different directions, being, more or less, tangential to cuticle surface. For D. sarsii, the sclerite axes (equal to aragonite c-axes) show a stronger tendency to parallel arrangement, while for S. margaritacea, sclerite and aragonite organization is strongly structured into sequential rows of orthogonally alternating sclerite directions. The different arrangements are well reflected in the structured orientational distributions of aragonite a-, b-, c-axes across the EBSD-mapped parts of the scleritomes. We discuss that morphological and crystallographic preferred orientation (texture) is not generated by competitive growth selection (the crystals are not in contact), but is determined by templating on organic matter of the sclerite-secreting epithelial cells and associated papillae.},
organization = {Projekt DEAL. C. S., J.-D.C.-C., A. G. C. were funded by the
project PID2020116660GB-I00 of the Spanish Ministerio de Ciencia e Innovación (MCIN/AEI/https:// doi. org/
10. 13039/ 50110 00110 33/) and PCM00092 (Junta de Andalucía)},
organization = {Research Group
RNM363 (Consejerı́a de Economı́a, Innovación, Ciencia y Empleo, Junta de Andalucı́a)},
organization = {Unidad Científica
de Excelencia UCE-PP2016-05 (University of Granada)},
organization = {J.-D.C.-C. was funded by the grant PCIN-2017–098
(Junta de Andalucía) (C.I.S.-D) and was supported by a pre-doctoral FPU grant (Ministry of Science, Innovation
and Universities)},
organization = {W. W. S., E. G., X. Y. were funded by the German Research Council Programmes GR 9/1234,
SCHM 930/11-2},
publisher = {Nature},
title = {Biomineral crystallographic preferred orientation in Solenogastres molluscs (Aplacophora) is controlled by organic templating},
doi = {10.1038/s41598-024-57754-z},
author = {Castro Claros, Juan Diego and Yin, X and Salas, C and Griesshaber, E and Hörl, S and Checa, A. G. and Schmahl, W. W.},
}