Brown Argonaut vs Common Paper Nautilus

Argonauta hians compared with Argonauta argo

Taxonomic Classification

Rank	Brown Argonaut	Common Paper Nautilus
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Mollusca (Moluscos)	Mollusca (Moluscos)
Class same	Cephalopoda (Cefalópodes)	Cephalopoda (Cefalópodes)
Order same	Octopoda (Polvo)	Octopoda (Polvo)
Family same	Argonautidae	Argonautidae
Genus same	Argonauta	Argonauta
Species	Argonauta hians	Argonauta argo

Evolutionary Relationship

Brown Argonaut and Common Paper Nautilus share a common ancestor at the Genus level: Argonauta.

Conservation Status

Brown Argonaut

LC — Least Concern

Common Paper Nautilus

LC — Least Concern

Physical Characteristics

Attribute	Brown Argonaut	Common Paper Nautilus
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brown Argonaut

Habitat

Native to Asia and South America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Chile and Taiwan.

Common Paper Nautilus

Habitat

Native to Asia and Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway, Portugal, and Taiwan.

Brown Argonaut

The Brown Argonaut (Argonauta hians) is a species in the genus Argonauta. It is currently classified as Least Concern on the IUCN Red List. Native to Asia and South America, inhabiting ecosystems characteristic of the region.

Common Paper Nautilus

<em>Argonauta argo</em> is a pelagic cephalopod mollusc in the family Argonautidae, found in open tropical and subtropical ocean waters across Asia and Europe, with records from Norway, Portugal, and Taiwan. Unlike true nautiluses, it belongs to the octopus lineage and produces a thin, papery egg case secreted by the female's webbed arms, which is commonly mistaken for a shell. The species inhabits surface to mid-water oceanic environments and is typically encountered near coastlines following storms or during seasonal current shifts. Females are significantly larger than males and carry the egg case containing developing embryos. The species is carnivorous, typically feeding on small crustaceans, zooplankton, and other small marine invertebrates. The IUCN classifies this species as Least Concern given its wide pelagic distribution. Its occurrence in Norway likely reflects occasional drift individuals carried northward by Atlantic currents rather than a breeding population. Biological traits such as average lifespan, body length, and body weight are not consistently recorded across populations in standardized databases, and detailed dietary studies remain poorly documented at the species level. <em>Argonauta argo</em> is often collected as a natural curiosity for its beautiful egg case.

Shared Countries

Both species can be found in 1 countries:

🇹🇼 Taiwan