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Which feature of Triodon bursarius is retained from the pelvic fin apparatus?
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tetraodontiform
Scrawled filefish (Aluterus scriptus)
Triodon bursarius, the sole living species of the family Triodontidae, is notable for being the only member of its suborder to retain the pelvic bone of the pelvic fin apparatus. While other members of the suborder Tetraodontoidei have completely lost this structure, Triodon bursarius preserves this skeletal element.1