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A vertebrate group of uncertain phylogeny, small eel-like conodonts, are known from microfossils of their paired tooth segments from the late Cambrian to the end of the Triassic. [30] Zoologists have debated whether teeth mineralized first, given the hard teeth of the soft-bodied conodonts, and then bones, or vice versa, but it seems that the ...
The following is a list of the classes in each phylum of the kingdom Animalia.There are 107 classes of animals in 33 phyla in this list. However, different sources give different numbers of classes and phyla.
The vast majority of extant fish are members of Osteichthyes, being an extremely diverse and abundant group consisting of 45 orders, over 435 families and 28,000 species. [3] It is the largest class of vertebrates in existence today, encompassing most aquatic vertebrates, as well as all semi-aquatic and terrestrial vertebrates.
The taxonomy of the vertebrates presented by John Zachary Young in The Life of Vertebrates (1962) [1] is a system of classification with emphasis on this group of animals. Phylum Chordata [ edit ]
Osteichthyes (bone-fish) or bony fishes are a taxonomic group of fish that have bone, as opposed to cartilaginous skeletons. The vast majority of fish are osteichthyans, which is an extremely diverse and abundant group consisting of 45 orders, with over 435 families and 28,000 species. [21] It is the largest class of vertebrates in existence today.
Vertebrates by year of formal description (6 C) Extinct vertebrates (7 C) Individual vertebrates (5 C, 2 P) Lists of vertebrates (7 C, 6 P) Vertebrates by location (10 C)
Squamata and Rhynchocephalia form the subclass Lepidosauria, which is the sister group to the Archosauria, the clade that contains crocodiles and birds, and their extinct relatives. Fossils of rhynchocephalians first appear in the Early Triassic, meaning that the lineage leading to squamates must have also existed at the time. [4] [5]
Euteleostomi (Eu-teleostomi [a], where Eu-comes from Greek εὖ 'well, good' [b] or Euteleostomes, also known as "bony vertebrates" [c]) is a successful clade that includes more than 90% of the living species of vertebrates.