海肠子是单环刺螠（Urechis unicinctus）的俗称，称其海肠子是因为其胴体红色而形似腊肠，称其单环刺螠是因为其肛门周围有一圈棘刺（见图1）。

Top 10 animals you won't believe actually exist.From a mole with a star for a nose to a giant spider crab we countdown 10 of the most bizarre animals in the world. An aye-aye is a rodent and monkey ...