Euteleostomi

Euteleostomi is a successful clade that includes more than 90% of the living species of vertebrates. Euteleostomes are also known as "bony vertebrates". Both major subgroups are successful today: Actinopterygii includes the majority of extant fish species, and Sarcopterygii includes the tetrapods. Euteleostomi is synonymous with "Osteichthyes" as the term is used in paleontology (i.e., "bony vertebrates"). In ichthyology and Linnaean taxonomy Osteichthyes, literally "bony fish," refers to the paraphyletic group that excludes tetrapods. The name Euteleostomi, coined as a (monophyletic) alternative that unambiguously includes the living tetrapods, is more widely used in bioinformatics and related fields. The term Euteleostomi comes from Eu-teleostomi, where "Eu-" comes from the Greek εὖ meaning well or good, so the clade can be defined as the living teleostomes.