common arm squid vs ornate arm squid

Brachioteuthis riisei compared with Brachioteuthis picta

Key Differences

• common arm squid is Data Deficient while ornate arm squid is Least Concern.

Taxonomic Classification

Rank	common arm squid	ornate arm squid
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Mollusca (软体动物门)	Mollusca (软体动物门)
Class same	Cephalopoda (头足纲)	Cephalopoda (头足纲)
Order same	Oegopsida (开眼目)	Oegopsida (开眼目)
Family same	Brachioteuthidae	Brachioteuthidae
Genus same	Brachioteuthis	Brachioteuthis
Species	Brachioteuthis riisei	Brachioteuthis picta

Evolutionary Relationship

common arm squid and ornate arm squid share a common ancestor at the Genus level: Brachioteuthis.

Conservation Status

common arm squid

DD — Data Deficient

ornate arm squid

LC — Least Concern

Physical Characteristics

Attribute	common arm squid	ornate arm squid
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

common arm squid

Habitat

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

Range

Distributed across Chile and Norway.

ornate arm squid

Habitat

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

Range

Found in Chile.

common arm squid

<em>Brachioteuthis riisei</em>, commonly known as the Common Arm Squid, is a cephalopod mollusk in the family Brachioteuthidae. This species is classified as Data Deficient on the IUCN Red List, reflecting significant gaps in knowledge about its population size, ecology, and distribution. Records of this species have been reported from waters off Chile and Norway, suggesting a broad oceanic distribution. Common Arm Squids are typically mesopelagic or bathypelagic organisms, inhabiting the open ocean at considerable depths during the day and often migrating toward shallower waters at night to feed. Like other oceanic squids, they are likely important components of marine food webs, serving as both predators of small fish and invertebrates and as prey for larger marine predators such as cetaceans and seabirds. The Data Deficient listing underscores the need for additional research into the biology, population dynamics, and conservation requirements of this understudied species. Biological traits of this species remain poorly documented in the scientific literature.

Shared Countries

Both species can be found in 1 countries:

🇨🇱 Chile