Family uncertain Genus Metaspriggina♀ SIMONETTA & INSOM 1993 メタスプリッギナ属 (絶滅)
◆メタスプリッギナ・ワルコッティ (絶滅) †Metaspriggina walcotti Simonetta & Insom 1993 *1993『New Animals from the Burgess Shale, Middle Cambrian and Their Possible Significance for the Understanding of the Bilateria:Alberto Mario Simonetta & Emilio Insom』。 *2008『A Re-Description of a Rare Chordate, Metaspriggina walcotti Simonetta and Insom, from the Burgess Shale, Middle Cambrian, British Columbia, Canada:Simon Conway Morris』。 *2019『Cambrian Chordates and Vetulicolians:Mark A.S.McMenamin』。
◆トゥルリモンストルム・グレガリウム (絶滅) †Tullimonstrum gregarium Richardson 1966 *1966『Wormlike Fossil from the Pennsylvanian of Illinois:Eugene Stanley Richardson Jr.』。 *1987『The Tully Monster, Mystery Animal of Illinois:Richard Leary』。 *2016『The Eyes of Tullimonstrum Reveal a Vertebrate Affinity:Thomas Clements, Andrei Dolocan, Peter Martin, Mark Andrew Purnell, Jakob Vinther & Sarah E.Gabbott』。 *2016『The Tully Monster is a Vertebrate:Victoria E.McCoy, Erin E.Saupe, James Christopher Lamsdell, Lidya G.Tarhan, Sean McMahon, Scott Lidgard, Paul Mayer, Christopher D.Whalen, Carmen Soriano, Lydia Finney, Stefan Vogt, Elizabeth G.Clark, Ross P.Anderson, Holger Petermann, Emma Rose Locatelli & Derek Ernest Gilmor Briggs』。 *2017『The Tully Monster is not a Vertebrate, Characters, Convergence and Taphonomy in Palaeozoic Problematic Animals:Lauren Sallan, Sam Giles, Robert Stephen Sansom, John T.Clarke, Zerina Johanson, Ivan James Sansom & Philippe Janvier』。 *2019『The Mazon Creek Lagerstatte, a Diverse Late Paleozoic Ecosystem Entombed within Siderite Concretions:Thomas Clements, Mark Andrew Purnell & Sarah E.Gabbott』。 *2022『Swimming Ability of the Enigmatic Carboniferous Fish, Tullimonstrum Gregarium:Jacob James Potter』。