coastal arrow worm vs Lang's Red Colobus

Parasagitta setosa compared with Piliocolobus langi

Key Differences

• coastal arrow worm is Not Evaluated while Lang's Red Colobus is Endangered.

Taxonomic Classification

Rank	coastal arrow worm	Lang's Red Colobus
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chaetognatha (arrow worms)	Chordata (Chordates)
Class	Sagittoidea (Sagittoidea)	Mammalia (Mammals)
Order	Aphragmophora (Aphragmophora)	Primates (Primates)
Family	Sagittidae	Cercopithecidae (Old World Monkeys)
Genus	Parasagitta	Piliocolobus
Species	Parasagitta setosa	Piliocolobus langi

Evolutionary Relationship

coastal arrow worm and Lang's Red Colobus share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

coastal arrow worm

NE — Not Evaluated

Lang's Red Colobus

EN — Endangered

Physical Characteristics

Attribute	coastal arrow worm	Lang's Red Colobus
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

coastal arrow worm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Russia.

Lang's Red Colobus

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

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.