Flea
A flea was a type of arthropod commonly found on Earth. 

In an alternate timeline in 1944, Sal described some of the women he had recruited to fight the Germans as being able to "shoot the fleas off a tick".  ()

In 2286, Leonard McCoy disparagingly described the  as a "Klingon flea trap." James T. Kirk, however, reminded him that they "could learn a thing or two from this flea trap," because it possessed a cloaking device. ()

Other types of fleas not commonly found on Earth include:

 Blood flea
 Belzoidian flea
 Melvaran mud flea
 Photonic flea

External link

de:Floh
Earth insects