Dichograptus

Dichograptus (meaning "two-branched writing" or "double-line marks") is an extinct genus of graptolites from the Ordovician.
"Dichograptus" probably fed on plankton. Individual animals were very tiny, only growing a few millimeters in length (1/8 of an inch).
Distribution.
Fossils of "Dichograptus" have been found in Argentina, Chile, China, Colombia (near Caño Cristales, Meta), New Zealand, Norway, and the United Kingdom.