Holotype FMNH PF15373 and paratype FMNH PF8472 from Moscovian Francis Creek Shale preserve a cyclostome–hagfish mosaic at roughly 310–307 Ma; the revised material is stem-hagfish evidence and is excluded from the crown-Myxini range.
Represented range310–307 Ma
RegionsFrancis Creek Shale, former Pit 11, Illinois, United States
Myxinikela siroka holotype FMNH PF15373 and paratype FMNH PF8472 from the Moscovian Francis Creek Shale, approximately 310–307 Ma, preserve a cyclostome–hagfish anatomical mosaic and support a stem or putative total-group hagfish interpretation; they do not set the crown-Myxini range or demonstrate modern hagfish habitat, slime production or ecology.