''Plagiochasma'' is an extinct echinoderm genus in the family Pygaulidae.''Plagiochasma'' on the Natural History Museum website
/ref> Species includes: * '' Plagiochasma cruciferum'' (Morton, 1830); Paleocene of Denmark, Belgium, The Netherlands, Trinidad and the United States * '' Plagiochasma faringdonense'' (Wright, 1875); Lower Greensand, Upper Aptian, Early Cretaceous of UK * '' Plagiochasma olfersii'' (L. Agassiz, 1836); Hauterivian, Early Cretaceous of France and Switzerland * '' Plagiochasma saurai'' Forner i Valls, 2016; Barremian, Early Cretaceous of Spain * '' Plagiochasma texanum'' Smith & Rader, 2009; Lower Albian, Texas, USA

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