Decapodiformes
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Decapodiformes is a superorder of Cephalopoda comprising all cephalopod species with ten limbs, specifically eight short arms and two long tentacles. It is hypothesized that the ancestral coleoid had five identical pairs of limbs, and that one branch of descendants evolved a modified arm pair IV to become the Decapodiformes, while another branch of descendants evolved and then eventually lost its arm pair II, becoming the Octopodiformes.
TaxonomyEdit
The following orders are recognised in the superorder Decapodiformes:<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
- Bathyteuthida
- †Belemnitida
- †Diplobelida
- Idiosepida – pygmy squid
- Myopsida – coastal squid
- Oegopsida – neritic squid
- Sepiida – cuttlefish, bobtail and bottletail squid
- Spirulida – ram's horn squid