Assertion: shark's structure | /r/ObjectUse | used for positioned
Facets:
value: at the pelvic fins
type: LOCATION
value: on the underside
type: LOCATION
Source sentences:
text: Like other elasmobranches, sawfish lack a swim bladder (instead controlling their buoyancy with a large oil-rich liver), have a skeleton consisting of cartilage, and the males have claspers, a pair of elongated structures used for mating and positioned on the underside at the pelvic fins.