Anaspidea

The orderAplysiida, commonly known as sea hares (Aplysia species and related genera), are medium-sized to very large opisthobranchgastropodmolluscs with a soft internal shell made of protein. These are marinegastropodmolluscs in the superfamilies Aplysioidea and Akeroidea. The common name "sea hare" is a direct translation from Latin: lepus marinus, as the animal's existence was known in Roman times. The name derives from their rounded shape and from the two long rhinophores that project upward from their heads and that somewhat resemble the ears of a hare. TaxonomyMany older textbooks and websites refer to this suborder as "Aplysiida". The original author Paul Henri Fischer described the taxon Aplysiida at unspecified rank above family. In 1925 Johannes Thiele established the taxon Aplysiida as a suborder. 2005 taxonomySince the taxon Aplysiida was not based on an existing genus, this name is no longer available according to the rules of the ICZN. Aplysiida has been replaced in the new Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005) by the clade Aplysiomorpha. The scientific name for the order in which they used to be classified, the Aplysiida, is derived from the Greek for "w