Broad skate vs common arm squid

Amblyraja badia compared with Brachioteuthis riisei

Key Differences

• Broad skate is Least Concern while common arm squid is Data Deficient.

Taxonomic Classification

Rank	Broad skate	common arm squid
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Elasmobranchii	Cephalopoda (Cephalopods)
Order	Rajiformes (Rajiformes)	Oegopsida (Oegopsida)
Family	Rajidae	Brachioteuthidae
Genus	Amblyraja	Brachioteuthis
Species	Amblyraja badia	Brachioteuthis riisei

Evolutionary Relationship

Broad skate and common arm squid share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Broad skate

LC — Least Concern

common arm squid

DD — Data Deficient

Physical Characteristics

Attribute	Broad skate	common arm squid
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Broad skate

common arm squid

Habitat

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

Range

Distributed across Chile and Norway.

Broad skate

The Broad Skate (Amblyraja badia) is a species in the genus Amblyraja. It is currently classified as Least Concern on the IUCN Red List. This species is recognized for its ecological significance within its native range.

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.