bytes) Fossil specimen of [[Pikaia]] from the [[Burgess Shale]] on display at the [[National Museum of Natural History|Smithsonian]] in Washington, DC. Image
DescriptionUSNM PAL 57628 Pikaia gracilens.jpg English: Catalog number USNM PAL 57628, a fossilized Pikaia gracilens specimen in a slab of Burgess shale