Seals belong to a group of animals called this, Latin for "fin-footed"
Seals
... [DOC] [TLE] 20 Animal Group Names You Probably Never Heard Of - Scribol.com [PAR] We've all heard the names for certain groups of animals  like a pack of mules or 
... the word 'plum', but a seal's Latin name, 'pinna', actually means 'fin-footed'.