Occurrence of the eudemersal radiodont<i>Cambroraster</i>in the early Cambrian Chengjiang Lagerstätte and the diversity of hurdiid ecomorphotypes
Yu Liu, Rudy Lerosey‐Aubril, Denis Audo, Dayou Zhai, Huijuan Mai, Javier Ortega‐Hernández
Abstract
Abstract Radiodonts are a diverse clade of Lower Palaeozoic stem-group euarthropods that played a key role in the emergence of complex marine trophic webs. The latest addition to the group, Cambroraster falcatus , was recently described from the Wuliuan Burgess Shale, and is characterized by a unique horseshoe-shaped central carapace element. Here we report the discovery of Cambroraster sp. nov. A, a new species from the Cambrian Stage 3 Chengjiang Lagerstätte of South China. The new occurrence of Cambroraster demonstrates that some of the earliest known radiodonts had already evolved a highly derived carapace morphology adapted to an essentially eudemersal life as sediment foragers.