Spirulida

• Oldest representative: Carboniferous, though contested: see Shimanskya • Oldest uncontested representative: Late Jurassic ==Classification==

Taxa marked with † are extinct. • Order Spirulida • Family †Shimanskyidae • Suborder †Groenlandibelina Khromov, 1990 • Family †Groenlandibelidae • Family †Adygeyidae • Suborder †Belopterina Engeser, 1998 • Family †Belemnoseidae • Family †Belopteridae • Suborder Spirulina Pompeckj, 1912 • Family †Spirulirostridae • Family †Spirulirostrinidae • Family Spirulidae ==References==