Spirulida
Spirulida is an order of cephalopods comprising one extant species and several extinct taxa.- Oldest representative: Carboniferous, though contested: see Shimanskya
- Oldest uncontested representative: Late Jurassic
Classification
- 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
