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^Zamora, Samuel, Yorkicystis, the 500 million-year-old relative of starfish that lost its skeleton, The Conversation, May 24, 2022 with images including a projection for the type species, Yorkicystis haefneri, named after its finder, Chris Haefner of York, Pennsylvania, USA, for genus that existed during the "Cambrian Explosion" that flourished 539 million to 485 million years ago — with additional references that could enable creation of a separate article on the genus — note: this source article has a Creative Commons license and may be republished freely