Pelvic fin structures can be extremely specialized in actinopterygians, with Gobiids and lumpsuckers modifying their pelvic fins into a sucker disk that allow them to adhere to the substrate or climb structures, such as waterfalls.
Pelvic fin structures can be extremely specialized in actinopterygians, with Gobiids and lumpsuckers modifying their pelvic fins into a sucker disk that allow them to adhere to the substrate or climb structures, such as waterfalls.