The families Geotriidae and Mordaciidae are sometimes merged into Petromyzontidae, leaving Petromyzontiformes monotypic.
Petromyzon + -iformes
"petromyzontiformes." YourDictionary, n.d. Web. 23 March 2019. <https://www.yourdictionary.com/petromyzontiformes>.
petromyzontiformes. (n.d.). Retrieved March 23rd, 2019, from https://www.yourdictionary.com/petromyzontiformes
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