Pikaia gracilens
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/USNM_PAL_57628_Pikaia_gracilens.jpg/220px-USNM_PAL_57628_Pikaia_gracilens.jpg)
Taxonavigation
editTaxonavigation: Chordata |
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Superregnum: Eukaryota |
Stem-group Chordata
Genus: †Pikaia
Species: †Pikaia gracilens
Name
editPikaia gracilens Walcott, 1911
References
editPrimary references
edit- Walcott, C.D. 1911. Middle Cambrian annelids. In: Cambrian geology and paleontology. II. Smithsonian Miscellaneous Collections 57: 109–144, pls. 18–23. BHL.