TY - GEN AU - Ruiz Villaespesa, Ernesto AU - Checa González, Antonio G. AU - Lucena Serrano, Cristina AU - Salas, Carmen PY - 2026 UR - https://hdl.handle.net/10481/111981 AB - The periostracum is the outermost shell layer and the first produced during shell formation in molluscs. This organic layer isolates the extrapallial space from the external environment and provides a scaffold for subsequent calcification. In... LA - eng PB - MDPI KW - Periostracum KW - Mollusca KW - Cephalopods TI - Periostracum Formation in Sepia officinalis and Loligo vulgaris and Homology with Other Molluscs DO - 10.3390/ani16050841 ER -