Claraia ranged from the late Permian to the Early Triassic. From the early Changhsingian to the Induan, byssal notches of Claraia species became narrower, and gradually changed from being ventrally extended to being horizontally extended. As the byssal notches narrowed, many Claraia species also lost most of their radial ornamentation. This resulted in a higher ratio of Claraia species with only concentric ornamentation to Claraia species with both concentric and radial ornamentation. Claraia experienced a rapid diversification and geographical expansion from the early Changhsingian to the Early Triassic. The rapid diversification of Claraia during the Permian–Triassic transition is related to a change in the genera’s morphology, making Claraia better adapted to the stressed environment near the Permian–Triassic Boundary (PTB), and as a result leading to Claraia being a successful disaster genus.
- Morphological evolution
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He, W., Zhang, K., Yang, T., Wu, S. (2014). Morphological Evolution of Claraia Species from the Late Permian (Changhsingian) to the Early Triassic (Induan) and the Response to the Permian–Triassic Stressed Environment. In: Rocha, R., Pais, J., Kullberg, J., Finney, S. (eds) STRATI 2013. Springer Geology. Springer, Cham. https://doi.org/10.1007/978-3-319-04364-7_197
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