Spirulida
Encyclopedia
Spirulida is an order
of cephalopod
s comprising one extant species (Spirula spirula) and several extinct
taxa
.
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...
of cephalopod
Cephalopod
A cephalopod is any member of the molluscan class Cephalopoda . These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles modified from the primitive molluscan foot...
s comprising one extant species (Spirula spirula) and several extinct
Extinction
In biology and ecology, extinction is the end of an organism or of a group of organisms , normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point...
taxa
Taxon
|thumb|270px|[[African elephants]] form a widely-accepted taxon, the [[genus]] LoxodontaA taxon is a group of organisms, which a taxonomist adjudges to be a unit. Usually a taxon is given a name and a rank, although neither is a requirement...
.
Classification
- Order Spirulida
- ?Family Shimanskyidae
- Suborder †Groenlandibelina
- Family †Groenlandibelidae
- Family †Adygeyidae
- Suborder †Belopterina
- Family †Belemnoseidae
- Family †Belopteridae
- Suborder Spirulina
- Family †Spirulirostridae
- Family †Spirulirostrinidae
- Family Spirulidae