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Proc Biol Sci. 2002 Sep 22;269(1503):1865-9.

New evidence on the anatomy and phylogeny of the earliest vertebrates.

Author information

1
Yunnan Research Centre for Chengjiang Biota, Yunnan University, Kunming 650091, Yunnan Province, People's Republic of China. hghou@ynu.edu.cn

Abstract

We report the discovery of a new agnathan specimen from the Lower Cambrian Chengjiang Lagerst├Ątte 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.

PMID:
12350247
PMCID:
PMC1691108
DOI:
10.1098/rspb.2002.2104
[Indexed for MEDLINE]
Free PMC Article

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