Simplify the following text for a Grade 8 native English-speaking person.
Original: Balaenoptera is the largest genus of the Rorqual whales , containing eight species , including the recently discovered Balaenoptera omurai in 2003 .
Simplified: Balaenoptera is a genus of Balaenopteridae , the Rorqual whales , and contains eight species . The species Balaenoptera omurai was published in 2003 .