Examples:
https://www.youtube.com/watch?v=W8LcUT2JLvU
https://youtu.be/W8LcUT2JLvU
Search Youtube: Colepidae

Coleps hirtus in activated sludgeColeps284 Vistas · 28.2.2017 [10:43]
Coleps: Little Piranhas of the microscopic worldColeps305 Vistas · 28.2.2017 [10:41]

Colepidae

46259
Protozoa
Family
 
NODC Taxonomic Code database 8.0
1996-07-29
Colepidae