Table 1. Morphometric data (in millimeters) of the new Amazona compared with other similarly red-fronted and –faced species of Amazona.
| Feature | New Amazona | A. a. nana | A .a. albifrons | A. a. saltuensis | A. xantholora | A. autumnalis | A. viridigenalis |
|---|---|---|---|---|---|---|---|
| Wing | 175.3 ♂ | 167.3 ♂ (Range 149.9–170.3) | 180.9 ♂ (Range 179.3–191.0) | 182.8 ♂ (Range 175.4–191.3) | 165.1 ♂ (Range 153.0–170.8 ) | 217.8a (Range 212.7–223.0) | 202.4 ♂ (Range 197.1–209.1) |
| 170.4 ♀ | 152.9 ♀ (Range 133.8–162.53) | 174.2 ♀ (Range 170.7–177.9) | 180.0 ♀ (Range 177.4–184.2) | 169.3 ♀ (Range 166.8–170.3) | 197.8 ♀ (Range 189.9–201.3) | ||
| Tail | 89.6 ♂ | 73.8 ♂ (Range 71.9–80.1) | 76.1 ♂ (Range 73.5–83.2) | 76.8 ♂ (Range 72.9–83.1) | 77.2 ♂ (Range 74.8–79.9) | 100.8a (Range 95.1–106.5) | 104.6 ♂ (Range 89.2–117.1) |
| 83.7 ♀ | 76.5 ♀ (Range 74.6–80.1) | 77.9 ♀ (Range 75.7–81.9) | 78.8 ♀ (Range 76.1–80.8) | 77.4 ♀ (Range 75.3–79.3) | 105.3 ♀ (Range 103.5–107.4) | ||
| Exposed culmen | 27.8 ♂ | 26.4 ♂ (Range 24.9–30.5) | 26.5 ♂ (Range 24.0–28.1) | 25.1 ♂ (Range 23.8–27.3) | 26.1 ♂ (Range 25.4–26.6) | 30.4a (Range 27.9–32.9) | 29.9 ♂ (Range 28.5–31.7) |
| 25.7 ♀ | 24.9 ♀ (Range 24.7–25.2) | 24.2 ♀ (Range 23.6–25.2) | 24.0 ♀ (Range 23.8–27.5) | 24.8 ♀ (Range 24.7–25.0) | 27.0 ♀ (Range 24.2–28.6) |
Notes.
Three individuals of each sex were measured for each taxon, except for Amazona autumnalis in which six birds of unknown sex were taken into account. Data were collected from living birds of known provenance and preserved skins in the collection of the Museo de las Aves de México (MAM), in Saltillo. The museum specimens are identified as: Amazona albifrons albifrons MAM 1076; A. albifrons nana MAM 2780, MAM 2217, MAM 2988, MAM 2433, MAM 1726; A. viridigenalis MAM 132, MAM 133, MAM 2725, MAM 1878, MAM 1548, MAM 1715, MAM 1723, MAM 1775, MAM 1377, MAM 2216, MAM 1547; A. autumnalis autumnalis MAM 2989, MAM 2987, MAM 1883, MAM 2448, MAM 1827, MAM 134; A. xantholora MAM 1948, MAM 737.
a
Unsexed specimens.
Geographic origin of studied individuals
- A. albifrons nana
- Zoologico de Merida, from the local population
- Amazona albifrons albifrons
- Planetaro Alfa, Monterrey, from the Guerrero population
- Amazona albifrons saltuensis
- Acuario de Mazatlán (a public aquarium that also displays birds), from Sinaloa specimens
- A. xantholora
- Zoologico de Merida, from the local population
- A. autumnalis autumnalis
- Planetario Alfa, from the southern Tamaulipas population
- A. viridigenalis
- Planetario Alfa, from the southern Tamaulipas population