Tabla 1. Número de especies de condrictios mexicanos por familia y su comparación relativa a nivel mundial.
Table 1. Comparison of the relative number of species by family of Mexican chondrichthyans worldwide.
| Orden | Familia | Mexico spp. | Mundial % | |
| Quimeras | Chimaeriformes | Rhinochimaeridae | 3 | 33,3% |
| Chimaeridae | 5 | 12,2% | ||
| Tiburones | Hexanchiformes | Chlamydoselachidae | 1 | 50% |
| Hexanchidae | 4 | 100% | ||
| Echinorhiniformes | Echinorhinidae | 2 | 100% | |
| Squaliformes | Squalidae | 4 | 13,8% | |
| Centrophoridae | 4 | 26,6% | ||
| Etmopteridae | 5 | 10,9% | ||
| Somniosidae | 3 | 17,6% | ||
| Oxynotidae | 1 | 20% | ||
| Dalatiidae | 5 | 55,5% | ||
| Squatiniformes | Squatinidae | 4 | 19% | |
| Heterodontiformes | Heterodontidae | 3 | 33,3% | |
| Orectolobiformes | Ginglymostomatidae | 2 | 50% | |
| Rhincodontidae | 1 | 100% | ||
| Lamniformes | Odontaspididae | 1 | 33,3% | |
| Rayas, torpedos y mantas | Torpediniformes | Torpedinidae | 3 | 12,5% |
| Narcinidae | 4 | 12,9% | ||
| Pristiformes | Pristidae | 2 | 28,6% | |
| Rhinobatiformes | Rhinobatidae | 9 | 18,7% | |
| Platyrhinidae | 1 | 16,7% | ||
| Rajiformes | Arhynchobatidae | 6 | 5,6% | |
| Rajidae | 31 | 18,0% | ||
| Anacanthobatidae | 4 | 33,3% | ||
| Myliobatiformes | Urotrygonidae | 11 | 61,1% | |
| Dasyatidae | 9 | 9,9% | ||
| Gymnuridae | 2 | 14,3% | ||
| Myliobatidae | 5 | 20% | ||
| Rhinopteridae | 2 | 25,0% | ||
| Mobulidae | 6 | 46,1% | ||
| Total | 214 | 17,3% |