Venomous Cephalopods
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All octopuses and cuttlefish, and some squids are venomous.*
The blue-ringed octopuses (genus Hapalochlaena) are among the most venomous animals in all of the world's oceans.
Striped pajama squids (Sepioloidea lineolata) excrete toxic slime when threatened to protect themselves.
Flamboyant cuttlefish (Metasepia pfefferi) is the only cuttlefish to have deadly poisonous flesh.
Source:
B.G. Fry, K. Roelants and J.A. Norman. Tentacles of Venom: Toxic Protein Convergence in the Kingdom Animalia. Journal of Molecular Evolution, 2009; 68 (4): 311 DOI: 10.1007/s00239-009-9223-8