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| | Table of Contents and Excerpt, McEachran and Fechhelm, Fishes of the Gulf of Mexico, Vol. 1 |
 | | These orders (Torpediniformes, Pristiformes, Rajiformes, and Myliobatiformes) are placed after the Hexanchiformes, Squaliformes, and Squatiniformes because the three orders of sharks plus the Pristiophoriformes and the four orders of rays are considered to constitute a monophyletic group (Shirai 1992). |
| | Halosauridae and Notacanthidae are placed in their own order (Notacanthiformes) rather than in the order Albuliformes with Albulidae. |
| | The two orders are thought to form a monophyletic group, but they are treated separately because of their distinctive body forms. |
| www.utexas.edu /utpress/excerpts/exmcefis.html (8939 words) |
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