Spirulida is an order of cephalopods comprising one extant species (Spirula spirula) and several extinct taxa.
Fossil record
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
Tree of Life: Spirulida The Taxonomicon: Order Spirulida Mikko's Phylogeny Archive: Spirulida