Ijima's Turtle-Headed Sea Snake
Emydocephalus ijimae
A docile, egg-eating sea snake from the Ryukyu Islands with a blunt, turtle-like head and reduced venom apparatus.
- Venomous?
- Mildly venomous
- Adult length
- 0.5-0.8 m (1.6-2.6 ft)
- Range
- Coral reefs of the Ryukyu Islands, Japan, and Taiwan
Found a snake like this?
Identify any snake from a photo, free.
Overview
Ijima's turtle-headed sea snake is a specialized reef-dwelling species closely related to the better-known turtle-headed sea snake of Australia. It feeds almost exclusively on fish eggs, an unusual dietary specialization among snakes.
Because its diet requires no venom to subdue, this species has greatly reduced fangs and venom glands, and it is considered harmless to humans in practical terms despite technically retaining trace venom.
How to identify it
- Blunt, rounded snout giving a turtle-like head profile
- Males often darker or more strongly banded than paler females
- Smooth, small scales adapted for close reef contact
- Compressed paddle tail typical of sea snakes
- Distinguished from other Hydrophis-type sea snakes by blunt head shape and docile behavior
Habitat & range
Restricted to coral reef habitats around the Ryukyu Islands of Japan and nearby Taiwanese waters. Found in shallow reef flats and lagoons where its egg-laying fish prey are abundant.
Behavior, diet & reproduction
Feeds specifically on the eggs of damselfish and similar reef fish, foraging by nosing into coral crevices. Extremely docile and tolerant of diver presence, rarely attempting to bite even when closely approached by snorkelers. Live-bearing, with reproduction tied to reef fish spawning cycles.
Frequently asked questions
Is Ijima's turtle-headed sea snake dangerous?
No, it is considered harmless to humans in practice due to its greatly reduced venom apparatus and passive temperament.
What does it eat?
It feeds almost exclusively on fish eggs found on coral reefs, an unusual diet for a snake.
Where is it found?
On coral reefs around the Ryukyu Islands of Japan and nearby Taiwan.
Why does it have a turtle-like head?
Its blunt snout is an adaptation for probing coral crevices in search of fish eggs.
Ijima's Turtle-Headed Sea Snake guides
In-depth guides for identifying and understanding Ijima's Turtle-Headed Sea Snake.
