Table 3.
Mean BSI value and evolutionary group of each South American mammalian order.
| ORDEN | no sp | Mean BSI | Evolutionary group |
|---|---|---|---|
| Micromammalian | 709 | 2.45 | |
| DIDELPHIMORPHIA | 59 | 2.00 | 1 |
| PAUCITUBERCULATA | 5 | 1.60 | 1 |
| MICROBIOTHERIA | 1 | 2.00 | 1 |
| RODENTIA | 437 | 1.79 | |
| Hystricognathi | 157 | 1.71 | 2 |
| Sciurognathi | 280 | 1.88 | 3 |
| INSECTIVORA | 5 | 2.00 | 3 |
| CHIROPTERA | 200 | 2.74 | |
| Emballonuroidea | 17 | 2.47 | 2 |
| Noctilionoidea | 125 | 2.54 | 1 |
| Vespertilionoidea | 58 | 3.22 | 3 |
| LAGOMORPHA | 2 | 5.00 | 3 |
| Macromammalian | 170 | 2.74 | |
| XENARTHRA | 29 | 2.48 | 1 |
| PRIMATES | 78 | 1.41 | 2 |
| CARNIVORA | 42 | 3.83 | 3 |
| PERISSODCTYLA | 3 | 2.67 | 3 |
| ARTIODACTYLA | 18 | 3.33 | 3 |
| Total | 879 | 2.60 |
No sp, species number. BSI, biomic specialization index. Evolutionary group: 1, South American autochthonous; 2, Eocene/Oligocene African immigrants; 3, Pliocene North American immigrants (the information of the evolutionary groups was obtained from [11,12,14,44,56,72,73]).