Decapodiformes is a superorder of Cephalopoda, which includes all species with ten limbs; the name derives from the Greek word meaning ten feet. The ten limbs are divided into 8 arms and 2 tentacles. It is presumed that an ancestral coleoid had five identical pairs of limbs, and that one branch evolved a modified arm pair IV and became the Decapodiformes species. Another branch evolved and then eventually lost its arm pair II, becoming the Octopodiformes.

The superorder of Decapodiformes includes:

• Order Spirulida: Ram's Horn Squid
• Order Sepiida: cuttlefish
• Order Sepiolida: pygmy, bobtail and bottletail squid
• Order Teuthida: squid

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Cephalopods

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