Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs. Most creatures known as sea slugs are gastropods, i.e. they are sea snails that, over e
The nudibranch Nembrotha aurea is a gastropod.
A sea cucumber also looks slug-like and is sometimes loosely called a "sea slug", but it is not a gastropod.
The nudibranch Glossodoris atromarginata
The sacoglossan Elysia crispata
Sea cucumbers are echinoderms from the class Holothuroidea. They are benthic marine animals found on the sea floor worldwide, and the number of known holothuroid species worldwide is about 1,786, with
Sea slug
…The nudibranch Nembrotha aurea is a gastropod. A sea cucumber also looks slug-like and is sometimes loosely called a "sea slug", but it is not a gastropod. Sea slug is a common name for some marine invertebrates…
Thelenota ananas, a giant sea cucumber from the Indo-Pacific tropics
Details of the mouth with its tentacles.
Synaptula lamperti lives on sponges (here in Indonesia).
Synapta maculata, the longest known sea cucumber (Apodida).