Commerson s Dolphin vs Sea Knotgrass

Cephalorhynchus commersonii compared with Polygonum maritimum

Key Differences

• Commerson s Dolphin is Least Concern while Sea Knotgrass is Not Evaluated.

Taxonomic Classification

Rank	Commerson s Dolphin	Sea Knotgrass
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Mammalia (Mammals)	Magnoliopsida (Dicots)
Order	Cetacea (Whales & Dolphins)	Caryophyllales (Caryophyllales)
Family	Delphinidae (Oceanic Dolphins)	Polygonaceae
Genus	Cephalorhynchus	Polygonum
Species	Cephalorhynchus commersonii	Polygonum maritimum

Conservation Status

Commerson s Dolphin

LC — Least Concern

Sea Knotgrass

NE — Not Evaluated

Physical Characteristics

Attribute	Commerson s Dolphin	Sea Knotgrass
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Commerson s Dolphin

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Sea Knotgrass

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Distributed across Chile, India, and Portugal.

Commerson s Dolphin

<em>Cephalorhynchus commersonii</em>, commonly known as Commerson's Dolphin, is a small cetacean in the family Delphinidae. This species is classified as Least Concern on the IUCN Red List and is notable for its striking black-and-white coloration, which makes it one of the most visually distinctive dolphin species. Commerson's Dolphins typically inhabit coastal and nearshore marine environments of the Southern Hemisphere, particularly around the Falkland Islands, the southern tip of South America, and a geographically isolated population near the Kerguelen Islands in the Indian Ocean. These dolphins are highly social animals, often observed in small groups engaging in acrobatic behaviors near the surface. They typically feed on fish, squid, and crustaceans, often hunting cooperatively in shallow waters and kelp beds. Their average lifespan is approximately 18 years, and they are known for their fast, energetic swimming. Commerson's Dolphins are sometimes caught as bycatch in fishing nets, posing a localized conservation concern despite their overall Least Concern status.