Lacking the structure or characteristics of an asellus; not formed into segments typical of certain isopod crustaceans.
From 'asellus' (woodlouse/isopod) + '-ate' (having the quality of), with the prefix 'a-' (without) creating a negation.
Asellate creatures are basically those that didn't evolve with the fancy segmented tail fan that woodlice have—evolution took different paths for different aquatic critters!
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