Class Heterokontae is a group of organisms that belong to the kingdom Stramenopila. It includes a diverse range of organisms that all share a common characteristic - they have two flagella of unequal length. They are also known as Stramenopiles, Ochrophytes, or Heterokontophyta. The term Heterokontae comes from the Greek words 'hetero' and 'kontos,' which mean 'different' and 'pole,' respectively. This class includes many different types of organisms, including diatoms, golden algae, brown algae, and labyrinthulids. Each organism within this group has a unique set of characteristics and adaptations that help it thrive in its particular environment.