The Telencephalon of Actinopterygian Fishes
1990; Springer Nature; Linguagem: Inglês
10.1007/978-1-4757-9622-3_2
ISSN1566-6816
Autores Tópico(s)Fish Biology and Ecology Studies
ResumoThe class of bony fishes or Osteichthyes is usually subdivided into two subclasses, the Actinopterygii or ray-finned fishes and the Sarcopterygii or lobe-finned fishes. The subclass last mentioned, the telencephalon of which will be treated in the next chapter, can further be subdivided into the Dipnoi or lungfishes and the Crossopterygii or tassel-finned fishes. The Actinopterygii constitute by far the most abundant group of recent vertebrates. They are usually subdivided into three superorders, the Chondrostei, Holostei, and Teleostei. Interestingly, these three superorders may be considered as representing three subsequent stages or gradations of actinopterygian evolution. The Chondrostei are considered as descendants of the Palaeoniscoidei, a primitive group of paleozoic fishes. During the early and middle Mesozoic times, the Chondrostei were supplanted by the Holostei, which in turn were largely replaced in the last phase of the Mesozoic era and the Cenozoic era by the expanding and now-abundant Teleostei.
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