Original: The cells typically have two slightly unequal flagella , both of which are smooth , and a unique organelle called a haptonema , which is superficially similar to a flagellum but differs in the arrangement of microtubules and in its use .
Simplified: The cells typically have two slightly unequal flagella and a unique organelle called a haptonema . This is is superficially similar to a flagellum , but differs in its arrangement of microtubules , and in its use .