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Vetulicolians are enigmatic fossils with a debated phylogenetic position; they first appeared during the Cambrian evolutionary explosion. The early Cambrian Chengjiang and Guanshan biotas from South China exhibit the highest taxonomic diversity of vetulicolians, with ten species described to date. Here we conduct a comparative study on the most common members of Genus Vetulicola that bear a quadrate...
Sponges are among the earliest diverging crown-group animals and widely regarded as the earliest biomineralizing animals. Indeed, unambiguous hexactine sponge spicules first occur in the lowermost Cambrian strata of the Fortunian Stage. Articulated sponge skeletons interpreted as hexactinellids and demosponges have been reported from Cambrian Stage 2–3 strata at multiple localities. Articulated sponge...
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