Subspecies
Listed alphabetically.
- A. c. albemarlensis Eibl-Eibesfeldt, 1962 – Isabela Island
- A. c. cristatus Bell, 1825 – Fernandina Island
- A. c. hassi Eibl-Eibesfeldt, 1962 – Santa Cruz Island
- A. c. mertensi Eibl-Eibesfeldt, 1962 – San Cristóbal and Santiago Islands
- A. c. nanus Garman, 1892 – Genovesa Island
- A. c. sielmanni Eibl-Eibesfeldt, 1962 – Pinta Island
- A. c. venustissimus Eibl-Eibesfeldt, 1956 – Española Island
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A. c. albemarlensis
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A. c. cristatus
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A. c. hassi
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A. c. mertensi
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A. c. nanus
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A. c. venustissimus
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