Poisonous Lizard — Heloderma Poisonous fish — Stone fish Poisonous spider — Lectodectus (black widows). Most venomous Indian snake — King cobra Most poisonous snake — Peninsular tiger snake Poisonous sea Snake — Hydrophis bechbeichei Poisonous coelenterate — Chiromax Poisonous Arachnid — Lectodectus