Speaker Series 2017: Mass Extinctions, Ray-Finned Fishes, and the Closing of Romer’s Gap

The actinopterygians, or ray-finned fishes, are a substantial and significant component of modern vertebrate (animals with backbones) diversity. Ray-finned fishes are bony and have paired fins that are supported by rays (the actinosts) that insert directly in the body. Examples of modern ray-finned fishes include trout, eels, and bettas. Despite their prevalence today, the early evolution of this group is poorly understood compared to other major groups, driven by a lack of informative fossil data.

In his talk, Conrad Wilson explains how recent work on Early Carboniferous fossil sites from Nova Scotia and around the world provide new insight into the evolution of this group and how the development of the modern vertebrates may have been influenced by the mass extinction at the end of the Devonian Period (419 – 359 million years ago).

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