Which historical name is explicitly listed as a junior synonym for *T. obesus*?
Answer
*Thynnus brachypterus*
Synonyms are older names that were once applied to an organism but are no longer considered valid, often arising from historical difficulties in distinguishing closely related species like Bigeye and Yellowfin tuna based only on external features. Among the examples cataloged in biological repositories, *Thynnus brachypterus* is explicitly cited as a junior synonym for *Thunnus obesus*. Other historical designations noted include *Thynnus obesus* and *Thunnus argentivittatus*. Modern scientific databases work to link all these past designations back to the current accepted name, *T. obesus*, to ensure clarity in global stock assessments.

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