Megachasma Taylor [L. R., Jr.], Compagno [L. J. V.] & Struhsaker [P. J.] 1983:96 Fem. Megachasma pelagios Taylor, Compagno & Struhsaker 1983. Type by original designation (also monotypic). •Valid as Megachasma Taylor, Compagno & Struhsaker 1983 -- (Compagno 1984:227 [ref. 6474], Maisey 1985 [ref. 6793] in Cetorhinidae, Compagno 1990:357 [ref. 22349], Hutchins 1994 [ref. 19054], Compagno 1999:477 [ref. 25589], Compagno 2001:75 [ref. 26323], Compagno 2003:369 [ref. 26984], Compagno et al. 2005:16 [ref. 29145], Hoese 2006:71 [ref. 28988], Wang et al. 2007:490 [ref. 32147], Nakaya 2010:69 [ref. 31150], Castro 2011:226 [ref. 31457], Del Moral-Flores et al. 2016:73 [ref. 34398], Ehemann et al. 2018:21 [ref. 36194], Stone & Shimada 2019:633 [ref. 37195], Ebert et al. 2021:41 [ref. 38234]). Current status: Valid as Megachasma Taylor, Compagno & Struhsaker 1983. Megachasmidae.