Brown eagle-ray vs coastal arrow worm

Aetomylaeus milvus compared with Parasagitta setosa

Key Differences

• Brown eagle-ray is Endangered while coastal arrow worm is Not Evaluated.

Taxonomic Classification

Rank	Brown eagle-ray	coastal arrow worm
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Chaetognatha (arrow worms)
Class	Elasmobranchii	Sagittoidea (Sagittoidea)
Order	Myliobatiformes (Myliobatiformes)	Aphragmophora (Aphragmophora)
Family	Myliobatidae	Sagittidae
Genus	Aetomylaeus	Parasagitta
Species	Aetomylaeus milvus	Parasagitta setosa

Evolutionary Relationship

Brown eagle-ray and coastal arrow worm share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Brown eagle-ray

EN — Endangered

coastal arrow worm

NE — Not Evaluated

Physical Characteristics

Attribute	Brown eagle-ray	coastal arrow worm
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brown eagle-ray

Habitat

Native to Asia, inhabiting ecosystems characteristic of the region.

Range

Found in Taiwan. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

coastal arrow worm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Russia.

Brown eagle-ray

The Brown Eagle-ray (Aetomylaeus milvus) is a species in the genus Aetomylaeus. It is currently classified as Endangered on the IUCN Red List. Native to Asia, inhabiting ecosystems characteristic of the region.

coastal arrow worm

Parasagitta setosa, the coastal arrow worm, is a chaetognath in the family Sagittidae inhabiting the coastal and neritic waters of the northeastern Atlantic Ocean and adjacent North Sea and Baltic Sea, with confirmed records from Denmark, Norway, and Russia. Arrow worms are small, transparent, torpedo-shaped marine invertebrates typically 1–5 centimeters long, and despite their common name, are neither worms nor closely related to any familiar animal group; they form their own phylum, Chaetognatha, comprising around 120 species. Parasagitta setosa is a predatory planktonic species, using stiff bristle-like grasping spines flanking its mouth to seize copepods, small fish larvae, and other zooplankton that form the bulk of its diet. It occupies neritic plankton communities, often occurring in brackish coastal waters and estuaries where many arrow worm species cannot tolerate reduced salinity. The species serves as an important prey item for fish including herring and sprat and functions as a significant link in coastal marine food webs. Arrow worm phylogenetic position has been debated extensively; molecular evidence places them near the base of protostome animals. The species is Not Evaluated by the IUCN, as marine zooplankton populations are rarely assessed due to monitoring challenges.