common arm squid vs Little Black Serotine

Brachioteuthis riisei compared with Eptesicus andinus

Key Differences

• common arm squid is Data Deficient while Little Black Serotine is Least Concern.

Taxonomic Classification

Rank	common arm squid	Little Black Serotine
Kingdom same	Animalia (प्राणी)	Animalia (प्राणी)
Phylum	Mollusca (मोलस्का)	Chordata (रज्जुकी)
Class	Cephalopoda (शीर्षपाद)	Mammalia (स्तनधारी)
Order	Oegopsida (Oegopsida)	Chiroptera (चमगादड़)
Family	Brachioteuthidae	Vespertilionidae
Genus	Brachioteuthis	Eptesicus
Species	Brachioteuthis riisei	Eptesicus andinus

Evolutionary Relationship

common arm squid and Little Black Serotine share a common ancestor at the Kingdom level: Animalia. (प्राणी)

Conservation Status

common arm squid

DD — Data Deficient

Little Black Serotine

LC — Least Concern

Physical Characteristics

Attribute	common arm squid	Little Black Serotine
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.

Little Black Serotine

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia, Ecuador, and Venezuela.

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.