 This situation was not officially fixed until 1993, when the International Commission on Zoological Nomenclature formally declared that Lydekker's statement about the "type" did not count as designating a neotype, and so the designation did not need to be reversed in light of the holotype's re-discovery.The ICZN, in the same decision (Opinion 1734, Case 2779), added the genus "Macropterygius" and species "M. trigonus" (originally "I. trigonus") to the list of generic and specific names, making both names "nomen conservandum".The original holotype specimen is currently held by the Academy of Natural Sciences in Philadelphia, cataloged as specimen number ANSP 10124.