part of start stage end stage Weberian ossicle zebrafish_anatomy TAO:0000461 ZFA:0000461 Weberian ossicles A group of modified neural arches and spines of the first four vertebrae. These include, from anterior to posterior, the claustrum, scaphium, intercalarium, and tripus. The os suspensorium is considered to be a fifth ossicle. Weberian apparatus solid compound organ larval:days 7-13 adult