Which specific river system basin confines the entire known wild population of *Hypancistrus zebra*?
Answer
Rio Xingu basin in Brazil
The scientific classification of *Hypancistrus zebra* establishes a precise geographic lock on its existence, confirming that its entire wild population is restricted to the Rio Xingu river system located in Brazil. This highly restricted range makes the species exceptionally vulnerable; any significant environmental disruption within this single watershed, such as those caused by proposed dam projects common to the region, poses an immediate threat of extirpation for the entire wild population.

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