2023
DOI: 10.3390/biology12091242
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A New Chengjiang Worm Sheds Light on the Radiation and Disparity in Early Priapulida

Deng Wang,
Jean Vannier,
Jie Sun
et al.

Abstract: The vast majority of early Paleozoic ecdysozoan worms are often resolved as stem-group Priapulida based on resemblances with the rare modern representatives of the group, such as the structure of the introvert and the number and distribution of scalids (a spiny cuticular outgrowth) and pharyngeal teeth. In Priapulida, both scalids and teeth create symmetry patterns, and three major diagnostic features are generally used to define the group: 25 longitudinal rows of scalids (five-fold symmetry), 8 scalids around… Show more

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