20.500.12556/DiRROS-21631 Changes in cuticle structure during growth in two terrestrial isopods (Crustacea: Isopoda: Oniscidea) Terrestrial isopods are a successful group of terrestrial crustaceans. Their exoskeletal cuticle has been studied in several species. However, it is not known whether the cuticle of these animals becomes thicker or how its structure changes as the animals grow. We aimed to determine the principles of upscaling of the exoskeletal cuticle during growth in the terrestrial isopods Armadillidium vulgare (Latreille, 1804) and Porcellio scaber Latreille, 1804 with scanning electron microscopy. The tergal cuticle becomes thicker with increasing body length. In A. vulgare, which rolls into a ball in defense against predators, the rate of increase of tergite thickness was greater than in P. scaber, which clings to the substrate when threatened. As the cuticles of both species become thicker, the proportion of the endocuticle in the cuticle increases. There is a strong correlation between cuticle thickness and the thickness of endocuticular lamellae. This indicates that in thicker cuticles, chitin-protein fibers in sequential layers change their orientation by a smaller angle. We found no significant differences in morphometric parameters between the cuticles of A. vulgare and P. scaber when controlling for cuticle thickness. This suggests that known differences in cuticle structure and composition between these two species may result from differences in cuticle thickness. development exoskeleton morphometry ultrastructure woodlice razvoj eksoskelet morfometrija enakonožci true false true Angleški jezik Slovenski jezik Neznano 2025-03-04 12:39:15 2025-03-04 12:39:15 2025-03-05 03:44:16 0000-00-00 00:00:00 2020 0 0 Nasl. z nasl. zaslona; Opis vira z dne 5. 11. 2020; str. 1-11 e2020041 Vol. 28 28 Oct. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2020-10-28 577 2358-2936 10.1590/2358-2936e2020041 35849475 https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-64972020000100237&lng=en&nrm=iso&tlng=en 1 5123b83e-f8ed-11ef-9f1e-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=30992 RAZ_Vittori_Milos_2020.pdf RAZ_Vittori_Milos_2020.pdf 1 288362127BCC86055C1668F30FCD6F2D cb7d46cb9e4615b0c73141f81fdc95325f14f7c3ae113245c4be30b7748e2c32 6234a2ef-f8ed-11ef-9f1e-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=30993 https://doi.org/10.1590/2358-2936e2020041 0 6c4dfeba-f8ed-11ef-9f1e-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=30994 Nacionalni inštitut za biologijo 0 0 0