Here are some answers: Family Amphitretidae: telescope octopus Family Bolitaenidae: gelatinous octopus Family Octopodidae: benthic octopus Family Vitreledonellidae: Glass Octopus Superfamily Argonautoida Family Alloposidae: Seven-arm Octopus Family Argonautidae: argonauts Family Ocythoidae: Tuberculate Pelagic Octopus Family Tremoctopodidae: blanket octopus
I think it depends on the type of octopus. I think the most common type of octopus is called the Common Octopus (octopus vulgaris). Hence the name! One of the most venemous types of octopus is the Blue Ringed octopus. If you are looking for a better answer search for 'types of octopuses' and maybe it will tell you which ones are more common.