Bigeye Sixgill Shark vs Green Sea Turtle

Hexanchus nakamurai compared with Chelonia mydas

Key Differences

• Bigeye Sixgill Shark is Near Threatened while Green Sea Turtle is Endangered.

Taxonomic Classification

Rank	Bigeye Sixgill Shark	Green Sea Turtle
Kingdom same	Animalia (حيوانات)	Animalia (حيوانات)
Phylum same	Chordata (حبليات)	Chordata (حبليات)
Class	Elasmobranchii	Reptilia (زواحف)
Order	Hexanchiformes (خانقات)	Testudines (سلحفاة)
Family	Hexanchidae	Cheloniidae (Sea Turtles)
Genus	Hexanchus	Chelonia (Green Sea Turtles)
Species	Hexanchus nakamurai	Chelonia mydas

Evolutionary Relationship

Bigeye Sixgill Shark and Green Sea Turtle share a common ancestor at the Phylum level: Chordata. (حبليات)

Conservation Status

Bigeye Sixgill Shark

NT — Near Threatened

Green Sea Turtle

EN — Endangered

Population: ~85.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Bigeye Sixgill Shark	Green Sea Turtle
Diet	—	Herbivore
Average Lifespan	—	80 years
Average Length	—	1.2 m
Average Weight	—	200.0 kg

Habitat & Geographic Range

Bigeye Sixgill Shark

Habitat

Native to Asia and South America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Taiwan and Venezuela. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Green Sea Turtle

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 8 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Australia, Brazil, Costa Rica, Indonesia, and Mexico. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Bigeye Sixgill Shark

The Bigeye Sixgill Shark (Hexanchus nakamurai) is a species in the genus Hexanchus. It is currently classified as Near Threatened on the IUCN Red List. Native to Asia and South America, inhabiting ecosystems characteristic of the region.

Green Sea Turtle

The green sea turtle is one of the largest sea turtles. They are named for the green color of their cartilage and fat, not their shells.