Myron karnsi, also known as the Aru mangrove snake or Karns' mangrove snake, is a species of venomous homalopsid snake native to the Aru Islands of Indonesia.

The specific epithet karnsi honours herpetologist Daryl Karns of the Field Museum of Natural History.

[1] This is a melanistic species.

[1] The species is known only from the Aru Islands of the Arafura Sea, lying between southern New Guinea and northern Australia.

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