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Sturgeons (Acipenseriformes) are an early\u2010diverging extant lineage of actinopterygians that retain prominent post\u2010cranial dermal skeletal elements. They retain a long robust spine at the leading edge of the pectoral fin, called the pectoral fin spines (PFS). PFS are bone elements that are present in many extinct and extant species of non\u2010tetrapod jawed fish. In this study, we characterize the structure (light, polarized, micro\u2010computed tomography and scanning electron microscopy), composition (FTIR, TGA, BMD), and mechanical properties (3\u2010point bending and microindentation) of the PFS of the Russian sturgeon (\n                    <jats:italic>Huso gueldenstaedtii<\/jats:italic>\n                    ). The microstructure of the PFS is highly organized as it is formed by dermal osteonal bone and parallel fibered bone. Its microarchitecture, along with high material toughness, anisotropy, and substantial ash content, enables the PFS to bear loads and function in both locomotion and protection. In addition, we show an interconnected network of neurovascular canals and ornamentations, features also found in PFS of other non\u2010tetrapod jawed fish. Collectively, these findings demonstrate that dermal bone can form structurally organized, mechanically competent load\u2010bearing elements and provide new insights into PFSs in ray\u2010finned fish.\n                  <\/jats:p>","DOI":"10.1002\/jmor.70187","type":"journal-article","created":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T07:07:31Z","timestamp":1792566451000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Functional Adaptations for Load\u2010Bearing in a Dermal Bone: The Pectoral Fin Spine of the Russian Sturgeon (\n                    <i>Huso Gueldenstaedtii<\/i>\n                    )"],"prefix":"10.1002","volume":"287","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6171-2752","authenticated-orcid":false,"given":"Esteban","family":"Marroqu\u00edn\u2010Arroyave","sequence":"first","affiliation":[{"name":"Robert H. 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