New evidence on the anatomy and phylogeny of the earliest vertebrates - PubMed (original) (raw)
New evidence on the anatomy and phylogeny of the earliest vertebrates
Hou Xian-guang et al. Proc Biol Sci. 2002.
Abstract
We report the discovery of a new agnathan specimen from the Lower Cambrian Chengjiang Lagerstätte of China and thereby provide new evidence on the myomeres (V-shaped), the branchial apparatus (gill filaments and arches), the dorsal fin and the gonads (24-26) of the earliest vertebrates. The new specimen and the co-occurring Myllokunmingia fengjiaoa and Haikouichthys ercaicunensis represent a single species, which is a primitive member of the crown group craniates (vertebrates) and post-dates the origin of the myxinoids (hagfish). The origin of the vertebrate clade is at least as old as Early Cambrian.
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