Fig. 7: Phylogenetic position of camenellans and other tommotiid clades among crown-brachiopods, -phoronids, -molluscs, and their respective stem lineages (modified from refs. 36,42).
From: Exceptionally preserved early Cambrian bilaterian developmental stages from Mongolia
The common ancestor of the molluscan and brachiopod stem-lineages is likely reconstructed as a slug-like vermiform organism with multiple sclerites arranged in concentric zones. The differing phylogenetic positions for Halkieria reflect the contrasting interpretations Vinther et al.33 and Sun et al.42, while the phylogenetic position of eccentrothecids and phoronids are presented as an unresolved consensus of recent studies40,42,45.
