Q: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Sea snakes , or " coral reef snakes " , are venomous elapid snakes .
A:
Sea snakes , or coral reef snakes , are a subfamily of venomous elapid snakes , the Hydrophiinae , that inhabit marine environments for most or all of their lives .