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Hydrophis major

Olive Headed Sea Snake

Venomous 💀💀💀💀 Very dangerous bite ref
Images automatically provided by Flickr & iNaturalist. Sporadic false assignment does occur.


The olive headed sea snake is said to be aggressive. Fatal bites had been caused by this snake. Keep in mind: Its bite is not painful. You can be bitten and envenomated without noticing it in time.
  • Length Adult

  • up to 196 cm ref
  • Length Newborn

  • 42 to 45 cm ref
  • Reproduction

  • unknown ref
  • Pupil Shape (when closed!)

  • round (or oval) ref
  • Fangs

  • fixed ref front-fanged ref
  • Teeth/Fang Length

  • 3.8 mm ref

Altitude range

Vertical distribution

-40 to 0 meter above sea level (a.s.l.) ref

Subspecies & Common Names

Hydrophis major  ENGLISH Common Sea Snake, Greater Sea Snake, Olive Headed Sea Snake, FRENCH Hydrophide Cercle ref

Full Taxonomy

  • I. Superfamily Colubroidea

  • Colubrids, elapids and vipers
  • II. Family Elapidae

  • Elapids
  • III. Subfamily Hydrophiinae

  • Sea snakes
  • IV. Genus Hydrophis

  • Sea snakes
  • V. Species Hydrophis major

  • Olive headed sea snake
  • VI. snakeID

  • 575
Look up complete taxonomic records of Hydrophis major (including synonyms) at THE REPTILE DATABASE (by Peter Uetz et al).