common Atlantic octopus vs Sydney octopus

Octopus vulgaris compared with Octopus tetricus

Key Differences

• common Atlantic octopus is Not Evaluated while Sydney octopus is Least Concern.

Taxonomic Classification

Rank	common Atlantic octopus	Sydney octopus
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Mollusks)	Mollusca (Mollusks)
Class same	Cephalopoda (Cephalopods)	Cephalopoda (Cephalopods)
Order same	Octopoda (Octopuses)	Octopoda (Octopuses)
Family same	Octopodidae (Common Octopuses)	Octopodidae (Common Octopuses)
Genus same	Octopus (Octopuses)	Octopus (Octopuses)
Species	Octopus vulgaris	Octopus tetricus

Evolutionary Relationship

common Atlantic octopus and Sydney octopus share a common ancestor at the Genus level: Octopus. (Octopuses)

Conservation Status

common Atlantic octopus

NE — Not Evaluated

Trend: Stable →

Sydney octopus

LC — Least Concern

Physical Characteristics

Attribute	common Atlantic octopus	Sydney octopus
Diet	Carnivore	—
Average Lifespan	2 years	—
Average Length	60 cm	—
Average Weight	5.0 kg	—

Habitat & Geographic Range

common Atlantic octopus

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Distributed across Chile, Denmark, Norway, Portugal, and Sweden.

Sydney octopus

common Atlantic octopus

One of the most studied invertebrates in neuroscience and behavioral biology, common octopuses inhabit rocky reefs and seafloors in tropical and temperate coastal waters globally. Highly intelligent with distributed nervous systems — two-thirds of their 500 million neurons reside in their arms — they demonstrate tool use, problem-solving, and individual personalities. Masters of camouflage, they change skin color and texture in milliseconds. They have three hearts, blue copper-based blood, and extremely short lifespans of 1–2 years.