A primitive fish close to the common ancestor of tetrapods and lungfish

Min Zhu () and Xiaobo Yu
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Min Zhu: Chinese Academy of Sciences
Xiaobo Yu: Kean University

Nature, 2002, vol. 418, issue 6899, 767-770

Abstract: Abstract The relationship of the three living groups of sarcopterygians or lobe-finned fish (tetrapods, lungfish and coelacanths) has been a matter of debate1,2,3,4,5. Although opinions still differ, most recent phylogenies suggest that tetrapods are more closely related to lungfish than to coelacanths6,7,8,9,10. However, no previously known fossil taxon exhibits a concrete character combination approximating the condition expected in the last common ancestor of tetrapods and lungfish—and it is still poorly understood how early sarcopterygians diverged into the tetrapod lineage (Tetrapodomorpha)7 and the lungfish lineage (Dipnomorpha)7. Here we describe a fossil sarcopterygian fish, Styloichthys changae gen. et sp. nov., that possesses an eyestalk and which exhibits the character combination expected in a stem group close to the last common ancestor of tetrapods and lungfish. Styloichthys from the Lower Devonian of China bridges the morphological gap between stem-group sarcopterygians (Psarolepis and Achoania)10 and basal tetrapodomorphs/basal dipnomorphs. It provides information that will help in the study of the relationship of early sarcopterygians, and which will also help to resolve the tetrapod–lungfish divergence into a documented sequence of character acquisition.

Date: 2002
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DOI: 10.1038/nature00871

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