Spirulida
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Spirulida is an order of
cephalopod A cephalopod is any member of the molluscan Taxonomic rank, class Cephalopoda (Greek language, Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral symm ...
s comprising one
extant Extant or Least-concern species, least concern is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Exta ...
species ('' Spirula spirula'') and several
extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...
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: SpirulidaThe Taxonomicon: Order Spirulida
{{Taxonbar, from=Q1370442 Cephalopod orders Cenozoic cephalopods