Initially interpreted as a primitive Cambrian mollusk, Shishania aculeata — a 500-million-year-old spine-covered fossil found in China’s Yunnan province — is in fact a distant relative of sponge-like creatures known as chancelloriids,…
Initially interpreted as a primitive Cambrian mollusk, Shishania aculeata — a 500-million-year-old spine-covered fossil found in China’s Yunnan province — is in fact a distant relative of sponge-like creatures known as chancelloriids,…