Shrimp like marine crustacean of the order euphausiacea?

You're describing krill, a group of small crustaceans belonging to the order Euphausiacea.

Here's why:

* Shrimp-like: Krill have a similar body shape to shrimp, with a long, segmented body, a carapace, and ten legs.

* Marine: Krill are exclusively found in the ocean.

* Order Euphausiacea: This is the scientific order that krill belong to.

While technically not "shrimp", krill are often referred to as "shrimp-like" due to their similar appearance.