coastal arrow worm vs 瓶鼻海豚

Parasagitta setosa compared with Tursiops truncatus

Key Differences

• coastal arrow worm is Not Evaluated while 瓶鼻海豚 is Least Concern.

Taxonomic Classification

Rank	coastal arrow worm	瓶鼻海豚
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum	Chaetognatha (毛颚动物门)	Chordata (脊索动物门)
Class	Sagittoidea (箭虫纲)	Mammalia (哺乳動物)
Order	Aphragmophora (无横肌目)	Cetacea (Whales & Dolphins)
Family	Sagittidae	Delphinidae (Oceanic Dolphins)
Genus	Parasagitta	Tursiops (Bottlenose Dolphins)
Species	Parasagitta setosa	Tursiops truncatus

Evolutionary Relationship

coastal arrow worm and 瓶鼻海豚 share a common ancestor at the Kingdom level: Animalia. (动物界)

Conservation Status

coastal arrow worm

NE — Not Evaluated

瓶鼻海豚

LC — Least Concern

Population: ~600.0K

Trend: Stable →

Physical Characteristics

Attribute	coastal arrow worm	瓶鼻海豚
Diet	—	Carnivore
Average Lifespan	—	45 years
Average Length	—	3.0 m
Average Weight	—	300.0 kg

Habitat & Geographic Range

coastal arrow worm

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Russia.

瓶鼻海豚

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 12 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Taiwan), Europe (6 countries), and South America (Colombia, Ecuador, Venezuela).

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.

瓶鼻海豚

作为研究最广泛、最受认可的海豚物种，宽吻海豚栖息于全球从沿岸浅水到远洋的温暖和温带海域。高度智能，大脑相对体型较大，展示自我认知、复杂交流和社会学习。生活在流动的分裂-融合社会中，合作围捕鱼群。是海洋生态系统健康的关键指示物种。

Shared Countries

Both species can be found in 2 countries:

🇩🇰 Denmark 🇳🇴 Norway