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Aplysiida
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<p>The <a href="/facts/Order_(biology)/GKLJvIpt">order</a> Aplysiida, commonly known as sea hares (<i><a href="/facts/Aplysia/NzU0uLKI">Aplysia</a></i> species and related genera), are medium-sized to very large <a href="/facts/Opisthobranchia/C4K6BhwU">opisthobranch</a> <a href="/facts/Gastropod/rYPqm3PT">gastropod</a> <a href="/facts/Mollusc/1elgknsQ">molluscs</a> with a soft internal shell made of protein. These are <a href="/facts/Marine_(ocean)/8W8lYgjD">marine</a> <a href="/facts/Gastropod/rYPqm3PT">gastropod</a> <a href="/facts/Mollusc/1elgknsQ">molluscs</a> in the superfamilies <a href="/facts/Aplysioidea/mdDFsx1J">Aplysioidea</a> and <a href="/facts/Akeroidea/zHgAGeBo">Akeroidea</a>. </p><p>The <a href="/facts/Common_name/3KNNezEU">common name</a> "sea hare" is a <a href="/facts/Calque/A9M3UtAo">direct translation</a> from <a href="/facts/Latin_language/pM3Kge85">Latin</a>: <i>lepus marinus</i>, as the animal's existence was known in Roman times. The name derives from their rounded shape and from the two long <a href="/facts/Rhinophores/VMsDqJwp">rhinophores</a> that project upward from their heads and that somewhat resemble the ears of a <a href="/facts/Hare/a3Pg06T3">hare</a>. </p>