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  • Ben Chand thinks this is interesting:

  Traversable
      Iterable
          Seq
              IndexedSeq
                  Vector
                  ResizableArray
                  GenericArray
              LinearSeq
                  MutableList
                  List
                  Stream
              Buffer
                  ListBuffer
                  ArrayBuffer
          Set
              SortedSet
                  TreeSet
              HashSet (mutable)
              LinkedHashSet
              HashSet (immutable)
              BitSet
              EmptySet, Set1, Set2, Set3, Set4
          Map
              SortedMap
                  TreeMap
              HashMap (mutable)
              LinkedHashMap (mutable)
              HashMap (immutable)
    ...
            
        
			

From

Cover of Programming in Scala, Third Edition

Note

Collection Hierarchy