Lyngbya (ling-bee-a) is a filamentous cyanobacteria usually having many cells joined together. They are often motile, gliding through the substrate. Probably the oldest recognizable organisms on Earth - traceable back to the earliest fossils, over 3 billion years old. Some are producers of toxins, some have nitrogen fixing abilities. There are many disc-shaped cells joined end to end to make up the filaments. The filaments can be huge, dwarfing not only many protists but also many metazoa. The organisms are photosynthetic, and also can glide slowly.
(photo/text: David Patterson, Linda Amaral Zettler and Virginia Edgcomb)